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SENTRON
Protection devices
3VA molded case circuit breakers
with IEC certificate
Manual
03/2019
A5E03603177010-03
Introduction
1
Description
2
Applications
3
Accessories
4
Service and maintenance
5
Technical specifications
6
Appendix
A
ESD guidelines
B
List of abbreviations
C
Conversion tables
D
Siemens AG
Division Energy Management
Postfach 32 20
91050 ERLANGEN
GERMANY
Document order number: 3ZW1012-0VA10-0AC1
Ⓟ 03/2019 Subject to change
Copyright © Siemens AG 2014.
All rights reserved
Legal information
Warning notice system
This manual contains notices you have to observe in order to ensure your personal safety, as well as to prevent
damage to property. The notices referring to your personal safety are highlighted in the manual by a safety alert
symbol, notices referring only to property damage have no safety alert symbol. These notices shown below are
graded according to the degree of danger.
DANGER
indicates that death or severe personal injury
will
result if proper precautions are not taken.
WARNING
indicates that death or severe personal injury
may
result if proper precautions are not taken.
CAUTION
indicates that minor personal injury can result if proper precautions are not taken.
NOTICE
indicates that property damage can result if proper precautions are not taken.
If more than one degree of danger is present, the warning notice representing the highest degree of danger will
be used. A notice warning of injury to persons with a safety alert symbol may also include a warning relating to
property damage.
Qualified Personnel
The product/system described in this documentation may be operated only by
personnel qualified
for the specific
task in accordance with the relevant documentation, in particular its warning notices and safety instructions.
Qualified personnel are those who, based on their training and experience, are capable of identifying risks and
avoiding potential hazards when working with these products/systems.
Proper use of Siemens products
Note the following:
WARNING
Siemens products may only be used for the applications described in the catalog and in the relevant technical
documentation. If products and components from other manufacturers are used, these must be recommended
or approved by Siemens. Proper transport, storage, installation, assembly, commissioning, operation and
maintenance are required to ensure that the products operate safely and without any problems. The permissible
ambient conditions must be complied with. The information in the relevant documentation must be observed.
Trademarks
All names identified by ® are registered trademarks of Siemens AG. The remaining trademarks in this publication
may be trademarks whose use by third parties for their own purposes could violate the rights of the owner.
Disclaimer of Liability
We have reviewed the contents of this publication to ensure consistency with the hardware and software
described. Since variance cannot be precluded entirely, we cannot guarantee full consistency. However, the
information in this publication is reviewed regularly and any necessary corrections are included in subsequent
editions.
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 3
Table of contents
1 Introduction................................................................................................................................... 9
1.1 About this documentation .................................................................................................... 9
1.2 Product-specific information............................................................................................... 10
1.2.1 Target readers ................................................................................................................... 10
1.2.2 Technical Support ............................................................................................................. 10
1.2.3 Reference documents ....................................................................................................... 10
2 Description ................................................................................................................................. 13
2.1 Overview - applications and portfolio ................................................................................. 13
2.1.1 Applications and possible uses .......................................................................................... 14
2.1.2 Portfolio ............................................................................................................................. 16
2.1.3 Application examples......................................................................................................... 20
2.1.4 Detailed information about applications and possible uses ................................................. 22
2.1.5 Technical specifications ..................................................................................................... 24
2.1.6 Molded case circuit breakers and accessories in the system .............................................. 28
2.2 Ergonomic design .............................................................................................................. 30
2.2.1 The right circuit breaker for any installation conditions ....................................................... 31
2.2.2 Ergonomic design of circuit breakers, handles and control elements .................................. 34
2.2.3 Wide range of accessories ................................................................................................ 37
2.2.4 Connection technology ...................................................................................................... 39
2.3 Technical details................................................................................................................ 41
2.3.1 Circuit breaker identification............................................................................................... 42
2.3.2 Operation .......................................................................................................................... 46
2.3.3 Design and components - 3VA1 ........................................................................................ 47
2.3.4 Design and components - 3VA2 ........................................................................................ 48
2.3.5 Current limitation ............................................................................................................... 49
2.3.6 Breaking capacity .............................................................................................................. 51
2.3.7 Infeed ................................................................................................................................ 52
2.4 Selectivity .......................................................................................................................... 53
2.5 Standards and guidelines .................................................................................................. 57
2.5.1 Compliance with standards ................................................................................................ 57
2.5.2 Electromagnetic compatibility ............................................................................................ 57
2.5.3 Certificates ........................................................................................................................ 58
2.5.4 Ambient conditions ............................................................................................................ 58
2.5.5 Permissible mounting positions and mounting positions with accessories .......................... 60
2.5.6 Safety clearances .............................................................................................................. 61
2.5.7 Arcing spaces.................................................................................................................... 67
2.5.8 Degrees of protection ........................................................................................................ 68
2.5.9 Environmental protection ................................................................................................... 68
2.6 Protection system .............................................................................................................. 69
2.6.1 Description of functions ..................................................................................................... 70
2.6.2 Characteristic curves ......................................................................................................... 72
2.6.3 Guide to setting the tripping characteristic.......................................................................... 73
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2.6.4 Overload protection (L) .......................................................................................................75
2.6.5 Short-time delayed short-circuit protection (S) ....................................................................76
2.6.6 Instantaneous short-circuit protection (I) .............................................................................76
2.6.7 Ground-fault protection (G) .................................................................................................76
2.6.8 Neutral conductor protection (N) .........................................................................................79
2.6.9 Zone selective interlocking (ZSI) .........................................................................................82
2.7 Thermal-magnetic trip unit ..................................................................................................85
2.7.1 Thermal trip unit (L) ............................................................................................................85
2.7.2 Magnetic trip unit with short-circuit protection (I) .................................................................85
2.7.3 Application cases and trip unit types ...................................................................................86
2.8 Electronic trip unit ...............................................................................................................87
2.8.1 Connections .......................................................................................................................89
2.8.2 Protection functions ............................................................................................................90
2.8.3 Operator controls ...............................................................................................................93
2.8.4 Load acceptance and load shedding - load management ..................................................102
2.8.5 Measuring with a Rogowski coil ........................................................................................103
3 Applications............................................................................................................................... 109
3.1 3VA IEC trip units .............................................................................................................109
3.2 Line protection applications of 3VA molded case circuit breakers ......................................110
3.2.1 Variants............................................................................................................................111
3.2.1.1 Thermal-magnetic trip units ..............................................................................................111
3.2.1.2 Electronic trip units ...........................................................................................................115
3.2.2 Overview of 3VA molded case circuit breakers in line protection applications ....................140
3.3 Motor protection applications of 3VA molded case circuit breakers ...................................144
3.3.1 3VA molded case circuit breakers for starter protection.....................................................145
3.3.2 3VA molded case circuit breakers for motor protection......................................................148
3.3.2.1 3VA2 motor protection circuit breaker up to 500 A, tested according to
IEC EN 60947-4-1 ............................................................................................................149
3.3.2.2 3VA2 motor protection breaker as tested motor protection combination, 3VA2 with
3RT ..................................................................................................................................150
3.3.2.3 Protection functions of 3VA2 molded case circuit breakers for motor protection ................150
3.3.3 ETU350M electronic trip unit ............................................................................................155
3.3.4 5-series and 8-series electronic trip units ..........................................................................158
3.3.4.1 ETU550M electronic trip unit ............................................................................................159
3.3.4.2 ETU860M electronic trip unit ............................................................................................161
3.4 Use of 3VA1 molded case circuit breakers as switch disconnectors ..................................165
3.4.1 Overview of 3VA1 as switch disconnectors .......................................................................169
3.4.2 Upstream protection of switch disconnectors ....................................................................170
3.5 DC network applications of 3VA molded case circuit breakers ..........................................172
3.5.1 Variants............................................................................................................................173
3.5.2 Breaking capacity with direct current.................................................................................174
3.5.3 Recommended circuit configurations for DC systems .......................................................175
3.6 Applications of the 3VA molded case circuit breaker with frequency converters ................177
3.7 400 Hz network applications of 3VA molded case circuit breakers ....................................179
3.8 IT system applications of 3VA molded case circuit breakers .............................................181
3.8.1 Selection criteria for 3VA molded case circuit breakers .....................................................181
3.8.2 Fault situation ...................................................................................................................182
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Manual, 03/2019, A5E03603177010-03 5
3.9 Safety-related applications of 3VA molded case circuit breakers ...................................... 183
4 Accessories .............................................................................................................................. 185
4.1 Overview of accessories for 3VA molded case circuit breakers ........................................ 185
4.1.1 Accessories groups ......................................................................................................... 185
4.1.2 Possible combinations of of accessories .......................................................................... 186
4.2 Internal accessories......................................................................................................... 191
4.2.1 Mounting locations on 3VA molded case circuit breakers ................................................. 191
4.2.2 Auxiliary and alarm switches............................................................................................ 197
4.2.3 Contact sequence diagrams ............................................................................................ 201
4.2.4 Technical specifications of auxiliary and alarm switches .................................................. 202
4.2.5 Auxiliary releases ............................................................................................................ 204
4.2.6 Time-delay devices for undervoltage releases ................................................................. 209
4.2.7 COM060 communication module ..................................................................................... 209
4.2.8 24 V module .................................................................................................................... 210
4.3 Connection system .......................................................................................................... 211
4.3.1 General information about cables and busbars ................................................................ 211
4.3.2 Portfolio of connection components for 3VA molded case circuit breakers ....................... 214
4.3.2.1 General overview ............................................................................................................ 214
4.3.2.2 Front cable connection .................................................................................................... 218
4.3.2.3 Front busbar and cable lug connections........................................................................... 232
4.3.2.4 Rear busbar and cable lug connections ........................................................................... 239
4.3.3 Further connection accessories ....................................................................................... 246
4.3.3.1 Insulating measures ........................................................................................................ 246
4.3.3.2 Auxiliary conductor terminal ............................................................................................. 269
4.4 Plug-in and draw-out technology...................................................................................... 272
4.4.1 Introduction ..................................................................................................................... 272
4.4.2 Overview of variants / products ........................................................................................ 275
4.4.3 General information ......................................................................................................... 276
4.4.4 Information about installation, built-on and built-in components ........................................ 277
4.4.5 Plug-in technology ........................................................................................................... 278
4.4.5.1 Product description .......................................................................................................... 278
4.4.5.2 Combination with other accessories................................................................................. 284
4.4.6 Draw-out technology........................................................................................................ 285
4.4.6.1 Product description .......................................................................................................... 285
4.4.6.2 Combination with other accessories................................................................................. 295
4.4.7 Accessories for plug-in and draw-out units ....................................................................... 295
4.4.7.1 Description of individual product variants ......................................................................... 295
4.4.7.2 Overview of technical specifications................................................................................. 307
4.4.7.3 Combination with other accessories................................................................................. 308
4.5 Manual operators ............................................................................................................ 309
4.5.1 Opening, closing and resetting the 3VA molded case circuit breaker ................................ 310
4.5.2 Front mounted rotary operator ......................................................................................... 312
4.5.3 Door mounted rotary operator .......................................................................................... 316
4.5.4 Side wall mounted rotary operator ................................................................................... 322
4.5.5 Locking and interlocking for manual operators ................................................................. 324
4.5.5.1 Locking by the handle ...................................................................................................... 324
4.5.5.2 Locking and interlocking by the rotary operator ................................................................ 326
4.5.6 Degree of protection ........................................................................................................ 329
4.5.7 Accessories ..................................................................................................................... 330
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4.6 Motor operators ................................................................................................................331
4.6.1 MO310 side mounted motor operator ...............................................................................331
4.6.1.1 MANUAL, AUTO and LOCK modes ..................................................................................334
4.6.1.2 Closing, opening and resetting the 3VA molded case circuit breaker .................................336
4.6.1.3 Faults, causes of faults and rectification of faults ..............................................................338
4.6.2 Motor operator MO320 .....................................................................................................339
4.6.2.1 MANUAL, AUTO and LOCK modes ..................................................................................341
4.6.2.2 Opening, closing and resetting the 3VA molded case circuit breaker .................................342
4.6.2.3 Faults, causes of faults and rectification of faults ..............................................................346
4.6.3 SEO520 motor operator with stored energy operator ........................................................347
4.6.3.1 MANUAL, AUTO and LOCK modes ..................................................................................349
4.6.3.2 Closing, opening and resetting the 3VA molded case circuit breaker .................................350
4.6.3.3 Faults, causes of faults and rectification of faults ..............................................................353
4.6.3.4 Communication ................................................................................................................354
4.6.3.5 Accessories......................................................................................................................355
4.6.4 Technical specifications ....................................................................................................357
4.7 Locking and interlocking ...................................................................................................360
4.7.1 General information ..........................................................................................................360
4.7.1.1 Locking ............................................................................................................................360
4.7.1.2 Interlocking.......................................................................................................................361
4.7.2 Locking ............................................................................................................................363
4.7.2.1 Padlock device for the handle ...........................................................................................363
4.7.2.2 Cylinder locks for locking the 3VA molded case circuit breaker .........................................365
4.7.3 Front interlocking ..............................................................................................................369
4.7.3.1 Cylinder locks for implementing interlocks between multiple 3VA molded case circuit
breakers ...........................................................................................................................369
4.7.3.2 Sliding bar with Bowden cable: Modules for sliding bar with Bowden cable .......................374
4.7.3.3 Sliding bar ........................................................................................................................377
4.7.4 Rear interlock ...................................................................................................................379
4.8 Residual current devices ..................................................................................................386
4.8.1 Portfolio............................................................................................................................386
4.8.1.1 Possible combinations of residual current devices and 3VA circuit breakers .....................394
4.8.2 Residual current devices for mounting on circuit breakers .................................................395
4.8.2.1 Side mounted residual current devices Basic RCD310 and Basic RCD510 .......................397
4.8.2.2 Loadside residual current devices Basic RCD320 and Basic RCD520 ..............................415
4.8.2.3 Loadside residual current device Basic RCD520B ............................................................428
4.8.2.4 Loadside residual current device Advanced RCD820 ........................................................452
4.8.2.5 Special operating modes of residual current devices .........................................................469
4.8.2.6 Technical specifications ....................................................................................................472
4.8.3 Modular residual current device ........................................................................................478
4.9 Communication and system integration ............................................................................484
4.9.1 System description ...........................................................................................................484
4.9.2 Communication system of the 3VA molded case circuit breaker ........................................484
4.9.3 COM800 / COM100 breaker data server...........................................................................486
4.9.3.1 Area of application............................................................................................................487
4.9.3.2 Features ...........................................................................................................................488
4.9.4 Communication with ETUs ...............................................................................................488
4.9.4.1 Area of application............................................................................................................488
4.9.5 DSP800 display ................................................................................................................489
4.9.6 Commissioning and testing of electronic trip units using powerconfig ................................490
4.9.7 Power management with powermanager ..........................................................................494
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Manual, 03/2019, A5E03603177010-03 7
4.10 EFB300 external function box .......................................................................................... 495
4.10.1 General information ......................................................................................................... 495
4.10.2 Power supply................................................................................................................... 496
4.10.3 Functions of the digital input and digital outputs ............................................................... 496
4.10.4 Zone selective interlocking (ZSI) ...................................................................................... 499
4.10.5 <SET> button .................................................................................................................. 501
4.10.6 Technical specifications ................................................................................................... 507
4.11 Test devices .................................................................................................................... 509
4.11.1 TD300 activation and trip box .......................................................................................... 509
4.11.1.1 Operation and execution of the TD300 tripping function ................................................... 510
4.11.1.2 Technical specifications of TD300 ................................................................................... 512
4.11.2 TD500 test device ........................................................................................................... 513
4.11.2.1 Operation and execution of test functions ........................................................................ 518
4.11.2.2 Executing the test functions using a PC and powerconfig................................................. 522
4.11.2.3 Parameterizing using the powerconfig software ............................................................... 523
4.11.2.4 Technical specifications of TD500 ................................................................................... 524
4.12 External current transformer for N conductor ................................................................... 525
4.12.1 Parameterization of the external N transformer ................................................................ 525
4.12.2 External current transformer for front busbar connector up to 630 A ................................. 526
4.12.3 External current transformer as straight-through transformer up to 1250 A ....................... 527
4.13 Escutcheon ..................................................................................................................... 528
4.13.1 Product description .......................................................................................................... 528
4.13.2 Labeling plate .................................................................................................................. 530
4.14 DIN rail adapter ............................................................................................................... 531
4.14.1 Introduction ..................................................................................................................... 531
4.14.2 Information about installation, assembly and attachment ................................................. 532
5 Service and maintenance ........................................................................................................... 535
5.1 Notes .............................................................................................................................. 535
5.2 Regular maintenance ...................................................................................................... 535
5.3 Maintenance following tripping of a molded case circuit breaker....................................... 537
5.4 Fault diagnostics ............................................................................................................. 538
6 Technical specifications ............................................................................................................. 539
6.1 Circuit diagrams .............................................................................................................. 539
6.1.1 3VA1 molded case circuit breakers .................................................................................. 539
6.1.1.1 Basic units ....................................................................................................................... 539
6.1.1.2 Accessories ..................................................................................................................... 542
6.1.1.3 Example: 3VA1 molded case circuit breaker with built-on/built-in accessories .................. 547
6.1.2 3VA2 molded case circuit breakers .................................................................................. 548
6.1.2.1 Basic units ....................................................................................................................... 548
6.1.2.2 Accessories ..................................................................................................................... 550
6.1.2.3 Example: 3VA2 molded case circuit breaker with built-on/built-in accessories .................. 563
6.1.3 Application example ........................................................................................................ 564
6.2 Dimensional drawings ..................................................................................................... 565
6.2.1 Dimensions of basic units ................................................................................................ 565
6.2.1.1 3VA10 and 3VA11 ........................................................................................................... 565
6.2.1.2 3VA12 ............................................................................................................................. 567
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6.2.1.3 3VA13 / 3VA14.................................................................................................................568
6.2.1.4 3VA20 / 3VA21 / 3VA22 ...................................................................................................569
6.2.1.5 3VA23 / 3VA24.................................................................................................................570
6.2.1.6 3VA25 ..............................................................................................................................571
6.2.2 Dimensions of accessories ...............................................................................................572
6.2.2.1 Connection technology .....................................................................................................572
6.2.2.2 Plug-in and draw-out units ................................................................................................584
6.2.2.3 Manual operators .............................................................................................................587
6.2.2.4 Motor operators ................................................................................................................600
6.2.2.5 Accessories for locking, blocking and interlocking .............................................................603
6.2.2.6 Residual current devices ..................................................................................................614
6.2.2.7 Communication and system integration ............................................................................619
6.2.2.8 EFB300 external function box ...........................................................................................620
6.2.2.9 Test devices .....................................................................................................................621
6.2.2.10 External current transformer for N conductor ....................................................................622
6.2.2.11 Escutcheon ......................................................................................................................624
6.3 Power losses ....................................................................................................................625
6.3.1 Power losses of 3VA1 molded case circuit breakers .........................................................625
6.3.2 Power losses of 3VA2 molded case circuit breakers .........................................................627
6.4 Derating and temperature compensation ..........................................................................628
6.4.1 Derating of 3VA1 molded case circuit breakers .................................................................628
6.4.2 Temperature compensation for thermal-magnetic trip units TM210, TM220 and TM240 ....632
6.4.3 Additional correction factors with frequencies other than 50/60 Hz for 3VA1 molded
case circuit breakers ........................................................................................................637
6.4.4 Correction factors with direct current for the thermal-magnetic trip units of 3VA1
molded case circuit breakers ............................................................................................638
6.4.5 Derating for the 3VA1 switch disconnector ........................................................................639
6.4.6 Derating for the electronic trip units of 3VA2 molded case circuit breakers ........................641
6.4.7 Use of terminals with auxiliary conductor connection ........................................................645
A Appendix .................................................................................................................................. 647
A.1 Standards and approvals ..................................................................................................647
B ESD guidelines .......................................................................................................................... 649
B.1 Electrostatic sensitive devices (ESD) ................................................................................649
C List of abbreviations ................................................................................................................... 651
C.1 List of abbreviations .........................................................................................................651
D Conversion tables ...................................................................................................................... 657
Glossary ................................................................................................................................... 661
Index ........................................................................................................................................ 667
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 9
Introduction
1
1.1
About this documentation
3VA molded case circuit breakers with certification according to standard IEC 60947
The 3VA molded case circuit breakers from the portfolio of SENTRON protection, switching,
measuring and monitoring devices ensure the reliable protection of people and property as
integral components of efficient power distribution systems.
The product portfolio is designed for use in markets where low-voltage switchboards are
installed according to IEC standards. The 3VA molded case circuit breakers are certified
according to IEC 60947 and are suitable for the following applications:
● Incoming and outgoing circuit breakers in distribution systems
● Switching and protection devices for motors (motor protection in combination with a
contactor and motor protection relay)
● Switch disconnectors
The 3VA molded case circuit breakers are available in the following versions:
● For line protection: The overload and short-circuit releases are designed for the protection
of wiring and non-motor loads.
● For generator protection
● For the protection of three-phase squirrel-cage motors
● For the protection of starter combinations comprising molded case circuit breaker,
contactor and overload relay: In this case, the 3VA molded case circuit breaker provides
the short-circuit protection and the disconnector functionality.
● As a switch disconnector in compliance with IEC 60947-3: These molded case circuit
breakers can be used as main switches for opening and closing or for disconnecting load
switches. They are not equipped with overload and short-circuit protection.
Scope of validity of this document
This manual has been specially compiled for the 3VA molded case circuit breakers certified
to IEC 60947 and their accessory products. This manual serves as a reference manual for
technical information regarding the configuration, commissioning and operation of
3VA molded case circuit breakers and their accessories.
Refer to the manual "3VA molded case circuit breakers with UL and IEC certification" (see
chapter Reference documents (Page 10)) for 3VA UL molded case circuit breakers certified
to UL 489.
Introduction
1.2 Product-specific information
3VA molded case circuit breakers with IEC certificate
10 Manual, 03/2019, A5E03603177010-03
1.2
Product-specific information
1.2.1
Target readers
Target readers of this documentation
The information contained in this manual is provided for the benefit of:
● Users
● Cubicle manufacturers
● Switchgear manufacturers
● Maintenance personnel
1.2.2
Technical Support
You can find further support on the Internet at:
Technical Support (http://www.siemens.com/lowvoltage/technical-support)
1.2.3
Reference documents
Further documents
You will find further information in the following documents:
Table 1- 1 Reference documents
Title
Article number
Link
Catalog - chapter "Molded case circuit
breakers"
(chapter 2 of LV 10)
3VA molded case circuit breaker catalog
(https://support.industry.siemens.com/cs/
ww/en/view/109750637)
Manual - 3VA27 molded case circuit
breakers and 3WL10 air circuit breakers
DE 3ZW1012-0WL10-0AB1 3VA27 molded case circuit breakers
manual
(https://support.industry.siemens.com/cs/
ww/en/view/109753821)
EN 3ZW1012-0WL10-0AC1
3VA UL molded case circuit breakers DE 3ZW1012-0VA51-0AB1 3VA UL molded case circuit breakers
manual
(https://support.industry.siemens.com/cs/
ww/en/view/109758561)
EN 3ZW1012-0VA51-0AC1
3VA molded case circuit breaker operat-
ing instructions
3VA molded case circuit breaker docu-
mentation (http://www.siemens.com/3VA-
Documentation)
Introduction
1.2 Product-specific information
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 11
Title
Article number
Link
System manual - Communication DE 3ZW1012-0VA20-0BB0 3VA molded case circuit breakers, com-
munication system manual
(https://support.industry.siemens.com/cs/
ww/en/view/98746267)
EN 3ZW1012-0VA20-0BC0
3VA molded case circuit breaker tables
(updated daily)
3VA molded case circuit breaker docu-
mentation (http://www.siemens.com/3VA-
Documentation)
SENTRON ATC5300 - Automatic transfer
switching equipment
DE A5E02469034-01 Automatic transfer control device
ATC5300
(http://support.automation.siemens.com/
WW/view/de/41909986/0/en)
EN A5E02469035-01
ATSE - Remote Control Software Manual DE A5E02469028-01 ATSE - Remote Control Software Manual
(http://support.automation.siemens.com/
WW/view/de/41909978)
EN
ATSE - Modbus Communication Protocol DE A5E02469001-01 ATSE - Modbus Communication Protocol
(http://support.automation.siemens.com/
WW/view/de/40761679)
EN
Grundlagen der Niederspannungsschalt-
technik (Fundamentals of Low-Voltage
Switchgear and Controlgear),
Siemens AG © 2008
— —
Hartmut Kiank, Wolfgang Fruth: Pla-
nungsleitfaden für Energieverteilungsan-
lagen (Planning Guide for Power
Distribution Plants),
Publicis Publishing
ISBN: A19100-L531-B115 —
Schalten, Schützen, Verteilen in Nieder-
spannungsnetzen (Switching, Protection
and Distribution in Low-Voltage Net-
works), substantially extended and
revised edition 1997
ISBN 3-89578-041-3 —
Siemens: Residual Current Protective
Devices, Low-Voltage Circuit Protection
Technology Primer Siemens AG ©
04 / 2009
E10003-E38-9T-B3011 —
Introduction
1.2 Product-specific information
3VA molded case circuit breakers with IEC certificate
12 Manual, 03/2019, A5E03603177010-03
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 13
Description
2
2.1
Overview - applications and portfolio
This chapter provides an overview of all molded case circuit breakers in the 3VA portfolio
and describes the potential areas of application for different circuit breaker models.
The topics discussed in this chapter are listed below:
● Applications and possible uses
● Portfolio
● Possible configurations
● Detailed information about applications and possible uses
● Technical specifications
● Molded case circuit breakers and accessories in the system
Description
2.1 Overview - applications and portfolio
3VA molded case circuit breakers with IEC certificate
14 Manual, 03/2019, A5E03603177010-03
2.1.1
Applications and possible uses
The two tables below show examples of possible uses and applications for 3VA molded case
circuit breakers.
Possible uses
The 3VA molded case circuit breakers can be used in various areas where they perform
different protection tasks. The following table (sorted according to breaking capacity) shows
the areas in which 3VA molded case circuit breakers are used:
Description
2.1 Overview - applications and portfolio
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Functions and applications
3VA molded case circuit breakers are used for various functions as shown in the table
below:
Molded case circuit breakers are primarily designed for the following applications:
● Subdistribution systems
● Industrial distribution systems
● Final distribution systems
● On-site isolation
● Use in machines
Description
2.1 Overview - applications and portfolio
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2.1.2
Portfolio
The 3VA molded case circuit breakers set new standards in flexibility and the variety of
modular accessories available. Standardized accessories suitable for use with several sizes
of the 3VA molded case circuit breaker up to 1000 A together with quick and easy installation
help to cut costs and save time.
Sizes
The integrated 3VA portfolio consists of two different ranges of molded case circuit breakers
in twelve frame sizes. The 1600 A frame size of the 3VA2 molded case circuit breaker and
the 400 A and 630 A of the 3VA1 molded case circuit breaker are new.
The 3VA1 molded case circuit breakers are available in 1 to 4-pole versions (3VA1 160 A) or
in 3 and 4-pole versions (3VA1 100 A to 630 A). The 3VA2 molded case circuit breakers are
available in 3 and 4-pole versions.
The circuit breakers are suitable for rated operational currents ranging from 16 A to 1600 A
and rated voltages up to 690 V AC, depending on the range and frame size.
Note
A separate manual is available for the 1600 A size of the 3VA27 molded case circuit breaker
(see chapter Reference documents (Page 10)). The rest of this manual will deal with the
properties and accessory components up to 1000 A in particular.
Description
2.1 Overview - applications and portfolio
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3VA1 molded case circuit breakers
The 3VA1 molded case circuit breakers reliably perform all the tasks required for line
protection.
Features
The key features of the 3VA1 range are:
● Compact design
● 1 and 2-pole versions in size 160 A; 3 and 4-pole versions in sizes 100 A, 160 A, 250 A,
400 A and 630 A
● Breaking capacity of 16 kA ... 70 kA at 415 V or 110 kA, (in sizes 400 A and 630 A), 3-
pole or 4-pole breakers and 36 kA at 240 V, 1-pole breakers (dependent on size)
● Fixed-mounted, plug-in version
● Thermal-magnetic trip units
● AC/DC applications
● No derating up to +50 °C
● Modular and easy-to-fit internal accessories with diverse functions
● Uniform accessories platform across all 3VA molded case circuit breakers
Compact dimensions
Thanks to a mounting depth of 70 mm and a cover size of 45 mm, the 3VA1 molded case
circuit breakers of sizes 100 A, 160 A and 250 A are optimized for installation in distribution
boards, where they are used for protecting cables and lines. A wide range of accessories is
also available for these applications, such as adapters for installation on DIN rails, as well as
residual current devices (RCD310 and RCD510) and motor operators (MO310) that can be
side mounted.
Thermal-magnetic trip units
The 3VA1 molded case circuit breakers have a thermal-magnetic trip unit with overload and
short-circuit protection. This has been developed for implementing economical, cost-efficient
installations up to 630 A. It is suitable for use in three-phase networks, AC networks, 400 Hz
applications and with DC currents.
Description
2.1 Overview - applications and portfolio
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3VA2 molded case circuit breakers
The 3VA2 molded case circuit breakers reliably perform all the tasks associated with line and
generator protection.
This range is designed for applications with more exacting requirements:
● Increased breaking capacity
● Excellent selective protection
● Integrated metering function
● Connection to a fieldbus communication system
Features
The key features of the 3VA2 range are:
● Compact dimensions
● 3 and 4-pole versions
● Four breaking capacity classes from 55 kA … 150 kA (at 415 V)
● Fixed-mounting, plug-in technology, draw-out technology
● Depending on size: Selective tripping at rated operational current difference 1 : 2.5 or with
ELISA 1 trip units: 1.6
● Electronic trip units
● Communication capability (ETUs 5-series and ETUs 8-series)
● Integrated metering function (ETUs 8-series)
● AC applications
● No derating up to +50 °C
● Modular and easy-to-fit internal accessories with diverse functions
● Uniform accessories platform across all 3VA molded case circuit breakers up to 1000 A
● Electronic Trip Units (ETU) with different setting values
Compact dimensions with expanded functionality
In addition to its expanded functionality, the 3VA2 molded case circuit breaker also comes
with compact dimensions for fixed mounting, as a plug-in version and a draw-out version.
A cover size of 70 mm for the door cutout (up to 630 A) and a complete selection of breaking
capacity classes from 55 kA to 150 kA at 415 V AC provide the necessary flexibility for
planning.
Despite its compact size, the circuit breaker offers the following benefits:
● Extremely high breaking capacity
● Extremely good selectivity
● Electronic trip units, versions with and without integrated metering function and optional
fieldbus communication interface
Description
2.1 Overview - applications and portfolio
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Selective contact system
With its contact system, the 3VA2 molded case circuit breaker is designed for fast selectivity
tripping. The selective contact system ensures the following:
● Dynamic instantaneous short-circuit range
● High breaking capacity
● Selective protection response of the molded case circuit breakers in relation to each other
● Selective protection response of the molded case circuit breakers in relation to other
protection devices (e.g. downstream low-voltage fuses)
Electronic trip unit (ETU)
The current sensor of the 3VA2 molded case circuit breaker comprises an iron-cored
transformer for the internal power supply and a Rogowski coil for precise current
measurement. Each transformer can be optimized accordingly for its specific task. Thanks to
the high accuracy of current measurement, the 3VA2 molded case circuit breaker is suitable
for power/energy measurement. In addition, finer adjustment of ground-fault current
monitoring is possible.
The electronic trip units (ETUs) provide the following protection functions:
● Overload protection L ("L" = Long-time delay)
Adjustable in steps from 40% to 100% of the rated operational current of the molded case
circuit breaker.
● Short-time delayed short-circuit protection S ("S" = Short-time delay) for time-selective
response in case of a short circuit
● Instantaneous short-circuit protection I ("I" = instantaneous):
● Protection of the neutral conductor against overload and short-circuit ("N" = neutral)
● Protection against residual currents to ground ("G" = Ground fault)
Energy management and communication
The electronic trip units (ETUs) provide the following energy management and
communication functions:
● Metering functions
● Transfer of measured values and status information of the circuit breaker to a higher-level
communication network
● Remote parameter assignment of tripping thresholds and circuit breaker parameters
● Flexible, local digital inputs and outputs via the EFB300 external function box
● Software commissioning support with the "powerconfig" software package
● Testing and archiving with the TD300 and TD500 test devices (with powerconfig)
Description
2.1 Overview - applications and portfolio
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2.1.3
Application examples
Description
2.1 Overview - applications and portfolio
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Description
2.1 Overview - applications and portfolio
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2.1.4
Detailed information about applications and possible uses
Description
2.1 Overview - applications and portfolio
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2.1.5
Technical specifications
1) A side plate must be installed (see chapter Insulating measures (Page 246)) if the installation conditions on the
right-hand side are such that the device is not finger-safe.
2) In 125 A, 160 A: Icu / Ics = 36 kA / 36 kA
Description
2.1 Overview - applications and portfolio
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a. A. On request
Description
2.1 Overview - applications and portfolio
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Description
2.1 Overview - applications and portfolio
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a. A. On request
1) Utilization category B only for 400 A and 500 A and ETUs 5-series 8-series
2) In 400/500 A and In 630 A: Ics = 65 kA
Description
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2.1.6
Molded case circuit breakers and accessories in the system
The 3VA molded case circuit breakers come with a large portfolio of internal and external
accessories that can be installed flexibly in any size of circuit breaker (depending on the type
of accessory).
The table below indicates which accessories are compatible with particular molded case
circuit breakers, and which sizes of breakers are compatible with the same accessory:
Description
2.1 Overview - applications and portfolio
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Overview of accessories in the system
Description
2.2 Ergonomic design
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2.2
Ergonomic design
This chapter provides an overview of the ergonomic design features of the 3VA molded case
circuit breakers and explains what makes them so special.
The topics discussed in this chapter are listed below:
● Optional installation variants
● Color-coded indication of switching position in the draw-out unit
● Clear status indication
● Active illumination
● Ergonomic handle
● Color-coded control elements
● Broad range of accessories
● Connection options
Integrated system
The 3VA molded case circuit breakers set new standards, not only in terms of their technical
features and functional scope, but also in terms of their design.
The 3VA range provides an integrated system with regard to operation, functionality and
installation. This principle is embodied in the basic units and in all internal and external
accessories.
The internal and external accessories of the 3VA molded case circuit breakers offer the
following benefits:
● Standardized methods of operation
● Standardized scope of functions
● Standardized installation procedures
● Uniform accessories from 16 A … 1000 A (e.g. auxiliary switches, auxiliary releases, etc.)
Description
2.2 Ergonomic design
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2.2.1
The right circuit breaker for any installation conditions
The range of molded case circuit breakers can be equipped with additional components so
that they can be installed as fully functional switches in any location, a feature of the product
which affords maximum flexibility to system planners.
The following components can be installed to suit the installation location:
● Front mounted rotary operator
● Door mounted rotary operator
● Side wall mounted rotary operator
● Motor operator
When the 3VA molded case circuit breaker is in the OFF position, it reliably disconnects all
current paths of the circuit in accordance with IEC 60947-2 and IEC 60204-1 (VDE 0113). In
the event of overvoltage between input and output, the reduced clearances prevent leakage
currents at the surface and ensure that the dielectric strength is not degraded. The
3VA molded case circuit breaker therefore also meets the requirements for disconnector
units according to IEC 60204-1.
The main switch or disconnector unit functionality is not diminished by installation of the
following accessory components:
● Plug-in and draw-out units
● Manual operator
● Motor operator
● Residual current device
Description
2.2 Ergonomic design
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Optional installation variants
3VA molded case circuit breakers are available in the following installation variants:
● Fixed mounted ①
● Plug-in technology ②
● Draw-out technology ③
All variants offer the full range of functions, e.g. they can be equipped with every kind of
accessory. In addition, the last two variants are designed to allow speedy molded case
circuit breaker replacement for maintenance purposes or visual indication of the electrical
isolation in the main circuit.
Description
2.2 Ergonomic design
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Indication of switching positions in the draw-out unit
The picture below illustrates the colors used to indicate the switching position in the draw-out
unit:
The switching position is indicated in a window of the draw-out unit and is clearly color-
coded, enabling immediate identification of the current switching position of the molded case
circuit breaker.
The draw-out unit has three switching positions:
● CONNECT:
The molded case circuit breaker is connected to the main circuit. The auxiliary circuits are
also closed.
● TEST:
In the TEST position, the main contacts of the molded case circuit breaker are not
connected to the main circuit, but only to the auxiliary circuit. This allows the functionality
of the auxiliary circuit and all of its components (auxiliary switches, auxiliary releases,
communication, etc.) to be tested when the main circuit is open.
● DISCONNECT:
The molded case circuit breaker is not connected to the main circuit nor to the auxiliary
circuit.
● UNBLOCK:
The molded case circuit breaker is not in any of the positions defined above and can be
moved by means of the crank handle.
Description
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Motor operator for remote control
3VA molded case circuit breakers can also be controlled remotely. Whether the circuit
breaker is controlled from "just" the other side of the closed panel door, or the breaker is
switched on via a control room or operator panel, for example, is irrelevant.
Motor operators are available as accessories for remote control of the circuit breakers.
2.2.2
Ergonomic design of circuit breakers, handles and control elements
Ergonomic handle
With its wide surface area, the ergonomic handle is designed to assist manual operation of
the circuit breaker. The white strip around the edge of the handle makes it easy to identify in
conditions of poor visibility. The additional rated operational current information stamped on
the white strip also significantly eases identification of the circuit breaker when it is one of
many breakers in a large switchboard installation.
Description
2.2 Ergonomic design
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Clear status indication
The possible switching positions of manual rotary operators are listed below:
● ON - red marking
● TRIP - yellow marking
● OFF - green marking
The handle clearly engages in one of these positions depending on the status of the molded
case circuit breaker. The switching positions are color-coded so that you can identify the
status of the circuit breaker at a glance.
Active illumination
You can retrofit an active illumination kit for handling manual rotary operators. The
illuminated indicator in the rotary handle signals the relevant switching position in the colors
red, yellow and green. This provides clear visualization of the switching position on-site in
conditions of poor visibility.
Description
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Color-coded control elements
The control elements on the thermal-magnetic and electronic trip units are color-coded.
The color of each control element indicates that it performs a specific function, helping you to
make the required settings quickly.
Description
2.2 Ergonomic design
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2.2.3
Wide range of accessories
The internal accessories (e.g. alarm and auxiliary switches, auxiliary releases, etc.) all
belong to one family and can be installed on any size of circuit breaker up to 1000 A in the
3VA1 and 3VA2 ranges. The accessories are designed for quick and easy installation. The
components are coded by color and design to ensure that they are always installed at the
correct position in the circuit breaker.
Color coding of accessories
Description
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A system of color coding has been used to clearly identify the specific functions of individual
accessories:
The cylinder lock and communication accessories included with the internal accessories in
the picture above are explained in chapters Locking and interlocking (Page 360) and
Communication and system integration (Page 484).
Fast assembly of motor operators
The motor operators have been designed for quick and easy assembly and disassembly.
The internal accessories are therefore easily accessible.
Description
2.2 Ergonomic design
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2.2.4
Connection technology
A large selection of connection technology is available for the 3VA range of molded case
circuit breakers.
The supported cable cross-sections are based on the size of the molded case circuit breaker
and the cable terminals used. The terminals are fitted either internally or externally to the
molded case circuit breaker.
With it you can implement various front and rear main conductor connections for the molded
case circuit breakers in all types of installation (fixed-mounted, plug-in and draw-out).
①
Box terminal
⑦
Front bus connectors extended
②
Wire connector
⑧
Front bus connectors offset
③
Wire connector, large
⑨
Rear connection stud flat
④
Nut keeper kit
⑩
Rear connection stud round
⑤
Nut keeper kit, right-angled
⑪
Wire connector for 2 cables
⑥
Bus connectors edgewise
⑫
Distribution wire connector for 6 cables
Description
2.2 Ergonomic design
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Cables and busbars
The 3VA molded case circuit breakers are designed for different cables and busbars:
● Different cable types, e.g.
– ① Circular conductor
– ② Sector-shaped conductor
– ③ Stranded
– ④ Finely stranded
● ⑤ Busbars
– Rigid
– Laminated or flexible
● ⑥ Laminated copper bar
● Different materials
– Copper cables
– Aluminum cables
Description
2.3 Technical details
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2.3
Technical details
A summary of the technical features of 3VA molded case circuit breakers can be found in
this chapter.
The topics discussed in this chapter are listed below:
● Circuit breaker identification
● Operation
● Design and components – 3VA1
● Design and components – 3VA2
● Current limitation
● Breaking capacity
Description
2.3 Technical details
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2.3.1
Circuit breaker identification
Each 3VA molded case circuit breaker can be clearly identified from various labels and
plates attached to the unit.
Circuit breaker labeling
Each 3VA molded case circuit breaker has labels displaying all the important technical
information, enabling unique identification:
①
Connection information label
④
Key electrical data
②
ETU connection designations
⑤
Internal accessories label
③
Adhesive label insert (in accessory
compartment)
Description
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Front panel: Labeling
The following information is displayed on the front panel of the circuit breaker:
①
Circuit breaker designation
⑦
Product version
②
Approvals
⑧
Article number
③
Rated operational current
⑨
Trip unit type
④
Knowledge Manager (see below)
⑩
Size and breaking capacity class
⑤
Rated operational current
⑪
Key electrical data
⑥
Date of manufacture
Knowledge Manager
A QR code is attached in a clearly visible location to every 3VA molded case circuit breaker.
This code can be scanned with a smartphone or a tablet PC. For the full range of QR code
functions, use the "Industry Support" app supplied free of charge by Siemens.
It allows you to directly view or download all relevant product information.
Description
2.3 Technical details
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The key electrical data label ⑪ contains the following information:
①
IEC breaking capacity values at various voltages
③
Insulation data
②
Frequency, utilization category
⑤
Supported standards
Connection information label
The connection information label displays the following information:
①
Approvals
④
Article number for operating instructions
②
Information about cable connections
⑤
Circuit breaker article number
③
Code for production
Description
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Label insert
The label insert can be found in the right-hand accessory compartment. When an accessory
(e.g. motor operator or manual operator) is installed on the circuit breaker, this label can be
attached to the accessory.
The label insert displays the following information:
● Information about the molded case circuit breaker
● Article number
● Key electrical data
Internal accessories label
You can make a note of the number of installed accessories on the internal accessories
label. This will enable you to ascertain which accessories are installed without removing the
accessory cover and to use the information, for example, to reorder components.
Description
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2.3.2
Operation
①
ON: Main contacts closed
③
OFF: Main contacts open
②
TRIP: Switching position following a trip
④
PUSH TO TRIP: Initiates a mechanical trip
The main contacts of the molded case circuit breakers are opened and closed by means of a
handle mounted on the front of the unit. All contacts open and close simultaneously on all
3VA molded case circuit breakers in response to the following events:
● The handle is moved from OFF to ON.
● The handle is moved from ON to OFF.
● The tripping mechanism is activated by a trip unit.
● The tripping mechanism is activated by auxiliary releases (e.g. shunt trips, trip units).
Reclosing the circuit breaker contacts from the TRIP position
Follow the steps below to reclose the circuit breaker contacts from the TRIP position:
1. Move the handle to the OFF position.
2. Move the handle to the ON position.
→ The breaker contacts are now closed.
Free tripping
All 3VA molded case circuit breakers have a free tripping capability. This function ensures
that the breaker cannot be prevented from tripping even if the operator blocks or is held
manually in the ON position or if the breaker is about to close.
Follow the steps below to test the free tripping function in order to verify that the breaker's
mechanical release system is working correctly:
1. Move the handle to the ON position.
2. Hold the handle in the ON position and press the button marked <PUSH TO TRIP>.
→ The circuit breaker trips and opens the main contacts.
→ The handle moves quickly into the TRIP position as soon as you release it.
Failure of the molded case circuit breaker to trip indicates that it is defective and must be
replaced.
Description
2.3 Technical details
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2.3.3
Design and components - 3VA1
The design of the 3VA1 molded case circuit breaker is illustrated in the diagram below:
①
Main connections
④
Rotary contact system
②
Breaker mechanism with handle
⑤
Arc plates
③
Trip unit: TMTU
⑥
Pole cassette enclosure
Description
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2.3.4
Design and components - 3VA2
The design of the 3VA2 molded case circuit breaker is illustrated in the diagram below:
①
Main connections
⑤
Arc plates
②
Breaker mechanism with handle
⑥
Maglatch
③
Trip unit: ETU
⑦
Current sensor
④
Rotary contact system
Description
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2.3.5
Current limitation
"Current limiting" means that the peak value of the prospective impulse short-circuit current ip
is limited to a smaller let-through current iD.
The compact design of the breakers has been made possible by their excellent current
limiting capabilities. In the event of a short-circuit, the molded case circuit breaker
substantially reduces the magnitude of the let-through currents, i.e. reduces the load
reaching downstream equipment (less thermal load, lower dynamic forces). The level of let-
through energy is also reduced to a considerable extent.
3VA molded case circuit breakers are designed with a current-limiting capability.
IEC EN 60947-2 (VDE 0660-101), section 2.3, page 12, defines current-limiting molded case
circuit breakers as follows:
"Circuit breaker that, within a specified range of current, prevents the let-through current from
reaching the prospective peak value and which limits the let-through energy (I2t) to a value
less than the let-through energy of a half-cycle wave of the symmetrical prospective current."
①
Unlimited current
②
Peak value of limited current
③
Limited current
iD Let-through current
ip Unlimited impulse short-circuit current
ta Break time
Description
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Double-rotary contact system
To achieve excellent current limiting, the 3VA molded case circuit breakers are equipped
with a rotary double-contact system that opens dynamically - on its own - above the specified
disengaging currents, on the principle of magnetic repulsion, before the expected peak value
of the short-circuit current is reached. These limits have been coordinated and optimized to
suit the overall device characteristics. This substantially reduces the thermal and mechanical
loading on the molded case circuit breaker and the electrical installation.
①
Fixed contacts
②
Rotary contact system
③
Arc splitter chute
The switching pole cassettes are optimized for high breaking capacity, and their rotary
double-contact system design enables extremely good current limiting thanks to the build-up
of peak arc voltage generated at both contacts in the event of a short-circuit. This results in
significant limitation of the let-through energy I²t and the let-through current.
3VA molded case circuit breakers with a rated operational current In > 630 A are equipped
with a single contact in order to optimize the mounting depth.
Description
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2.3.6
Breaking capacity
The rated ultimate short-circuit breaking capacity Icu is the maximum value of the short-circuit
current which the protective device is capable of disconnecting in accordance with
regulations. Up to this value, the protective device is also allowed to be used in a network.
The 3VA molded case circuit breakers are available with identical external dimensions but
various breaking capacity classes according to size and rated operational current range.
The tested tolerance range of the rated operational voltages is ±5%.
Breaking capacity of the 3VA1 range
1)
I
n
125 A, 160 A: I
cu
/ I
cs
= 36 kA / 36 kA
Description
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Breaking capacity of the 3VA2 range
1) In 400/500 A and In 630 A: Ics = 65 kA
2.3.7
Infeed
The 3VA molded case circuit breakers can be supplied with power from above and below.
Description
2.4 Selectivity
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2.4
Selectivity
Switching devices connected in series, e.g. molded case circuit breakers and fuses, work
together to ensure graded tripping of these switching devices. The closest, upstream
switching device before the location of the short-circuit must trip. The other switching devices
on the same current run do not trip. The purpose of selectivity is to minimize the effects of a
fault in terms of its duration and the area affected by the fault.
Selectivity is achieved when the circuit breakers are matched to each other by means of
selection, configuring and trip settings in such a way that, in the event of a fault, only the
breaker closest to the location of the fault trips.
Short-circuit location
Selective behavior
The selective behavior of molded case circuit breakers is mainly influenced by the following
factors:
● Tripping value settings of the trip unit
● Tripping and break times
● Let-through current values
● Modes of switching of the relevant circuit breakers
– Zero-current interrupter
– Current limiter
Description
2.4 Selectivity
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The selective behavior of circuit breakers can be implemented technically by a variety of
selectivity concepts:
● Current selectivity
The selectivity can be calculated in the overload range by comparing the time/current
characteristics. In the short-circuit range, this comparison leads to values that are too low.
The reason for this is that the trip unit behaves differently in the case of short-circuit
currents compared with its long-term behavior, e.g. in the case of overload.
If the short-circuit currents differ sufficiently at the installation points of two molded case
circuit breakers, the instantaneous short-circuit releases can normally be set such that if a
short-circuit occurs behind the downstream circuit breaker, only this downstream breaker
trips.
If the short-circuit currents are approximately the same at the installation points of the
molded case circuit breakers, the grading of the tripping currents of the short-circuit
releases only enables selectivity up to a specific short-circuit current .
This current is referred to as the ultimate selectivity value Is.
● Time selectivity
Selectivity can be achieved by time selectivity up to the threshold values of the
instantaneous short-circuit releases. To achieve this, the upstream circuit breaker
requires delayed short-circuit releases, so that in the event of a fault, only the
downstream circuit breaker will disconnect the part of the electrical installation affected by
the fault from the supply.
Both the tripping delays and the tripping currents of the short-circuit releases are graded.
● Zone selective interlocking - ZSI
Selective behavior is achieved by installing parallel control cables between the molded
case circuit breakers. The electronic trip units then use a fast signal link to determine
priorities in the tripping sequence.
Zone selective interlocking (ZSI) was developed by SIEMENS to prevent undesirably long
tripping times when several molded case circuit breakers are connected in series.
ZSI enables the tripping delay to be reduced to 50 ms for the circuit breaker upstream
from the location of the short circuit.
● Dynamic selectivity
This method is based on evaluation of the arc power which is generated in the arc chute
when the contacts open dynamically in response to a short circuit. During this process, a
smaller sized downstream molded case circuit breaker converts more energy in the arc
chute than the larger, upstream molded case circuit breaker. A selective trip unit
evaluates the energy conversion in both molded case circuit breakers. The downstream
molded case circuit breaker trips, while the contacts of the upstream circuit breaker close
again. Since both molded case circuit breakers perform a current limiting function, the
residual current limit imposed in practice is higher than the limiting action specified for the
individual molded case circuit breakers.
Description
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Full selectivity
There is an increasing demand for full selectivity in order to safeguard continuity of service
by power distribution systems. A power system is said to be fully selective if only the
protective device located upstream of the fault location when viewed in the direction of
energy flow, i.e. from the infeed to the load, trips in the event of a fault.
Full selectivity always refers to the short-circuit current occurring at the installation point.
Partial selectivity
A system is said to be partially selective when selective tripping in response to a system fault
is not ensured up to the maximum ultimate short-circuit breaking capacity Icu of the switching
devices. Selectivity is then ensured only up to a certain Is current value (ultimate selectivity
value). If the calculated prospective short-circuit current at the installation point of the
downstream protective device is lower than the ultimate selectivity value specified for the
switchgear assembly, then it is still possible to describe the system as fully selective.
If the value determined by the short-circuit current calculation (e.g. according to
IEC / EN 60909, DIN VDE 0102) at the installation point of the downstream circuit breaker is
below the selectivity limit current listed in the respective table for the selected combination,
selectivity is guaranteed for all possible short circuits at the installation point.
If the calculated short-circuit current at the installation point is higher than the ultimate
selectivity value, selective tripping by the downstream circuit breaker is only assured up to
the value listed in the table. A judgment must be made as to whether the value can be
considered to be sufficient because the probability that the maximum short-circuit current will
occur is low, for example. Otherwise, a circuit breaker combination should be chosen whose
selectivity limit lies above the maximum short-circuit current.
Selectivity with 3VA2 molded case circuit breakers
The 3VA2 range is designed to deliver excellent selective tripping combined with optimum
current limiting and outstanding breaking capacity.
3VA2 molded case circuit breakers have been specifically designed to meet the following
requirements:
● System-wide, high selectivity with a rated operational current interval of 1 : 2.5 up to the
miniature circuit breaker (for molded case circuit breakers with ELISA trip units, even 1
: 1.6 to each other or to LV HRC fuses)
● Selectivity in combination with high current limiting and high breaking capacity
● Cost-effective design / configuring of selective power distribution systems
These molded case circuit breaker requirements are achieved in engineering terms as
follows:
● Rotary double-contact system for highly dynamic opening response
● Coordinated electronic trip units
● Dynamic selectivity
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Depending on the molded case circuit breakers used, with a size/rated operational current
differential in a ratio of at least 1 : 2.5 and selection of suitable breaking capacity classes,
you can achieve selective tripping of the area of the installation directly affected by the fault
up to the maximum ultimate short-circuit breaking capacity.
You can find information on selectivity values for 3VA2 molded case circuit breakers on the
Internet under the link for 3VA documentation (http:/www.siemens.com/3VA-
Documentation).
Electronic trip units and fast trip units
As a protective device, the molded case circuit breaker is required to clear electrical faults in
the system. For this purpose, 3VA2 circuit breakers are equipped with intelligent electronic
trip units which can be combined with metering functions.
The tripping characteristic of the electronic trip units can be finely and flexibly adjusted. In
the event of short circuits, a fast trip unit also responds according to the arc power from the
arc chute. This selective trip unit ensures that major short circuits are cleared more quickly,
while at the same time ensuring that medium short circuits are interrupted selectively.
Description
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2.5
Standards and guidelines
All the standards and guidelines with which 3VA molded case circuit breakers comply are
summarized in this chapter.
The topics discussed in this chapter are listed below:
● Compliance with standards
● Electromagnetic compatibility
● Ambient conditions
● Degrees of protection
2.5.1
Compliance with standards
The standards fulfilled by the 3VA molded case circuit breakers include:
● IEC / EN 60947-1
● IEC / EN 60947-2
● IEC / EN 60947-2, Annexes B, H and M
● IEC / EN 60947-3
● IEC / EN 60947-6-1
2.5.2
Electromagnetic compatibility
The 3VA molded case circuit breakers meet the requirements of the following standards:
● CISPR11, Class A and Class B
● IEC / EN 60947-1, Annex S
● IEC / EN 60947-2, Annexes B, F, J and N
The 3VA molded case circuit breakers are adequately resistant to the following factors:
● Electrostatic charge
● Electrostatic discharge
● Electromagnetic waves, e.g. from transmission systems, mobile phones, radio telephone
sets and radar systems
● Overvoltage, e.g. caused by lightning
● Voltage surges
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2.5.3
Certificates
You can find information on the available certification (CE, UL, CSA, FM, marine approvals)
on the Internet (http://support.automation.siemens.com/WW/view/en/54137334/134200).
In the Entry List you can use the certificate type (e.g. general product approval, explosion
protection, test certificates, shipbuilding) as a filter criterion.
2.5.4
Ambient conditions
Pollution degree
Operation of the 3VA1 and 3VA2 molded case circuit breakers is approved in accordance
with IEC / EN 60947-1 and IEC / EN 60664-1 for pollution degree 3.
Ambient temperature
3VA molded case circuit breakers are used at ambient temperatures from -25 °C to +70 °C.
Derating (reduction in rated operational current) is required at temperatures above +50 °C.
You will find more information on the applicable derating factors in chapter Derating and
temperature compensation (Page 628).
The permissible storage temperature in original Siemens packaging is between -40 °C
and +80 °C.
Special climatic requirements
3VA molded case circuit breakers can also be used under harsh conditions.
Harsh conditions of storage, transportation and stationary use
The molded case circuit breakers have been tested according to the relevant special test
procedures defined in IEC / EN 60947-1, Annex Q for
Class E
applications.
This class covers the areas MC3 + CC2 + SC1:
● Ambient temperature
● Humidity
● Vibration environment
● Shock environment
These ambient conditions can be referred to as "Open deck, damp and cold atmosphere
without salt spray" or "Difficult, non-marine conditions".
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The following standards-related criteria are complied with:
● IEC / EN 60068-2-2 "Bd" and IEC / EN 60068-2-1 "Ab":
Temperature range: -25 °C … +70 °C
● IEC / EN 60068-2-30 "Db"
Humid heat up to +55 °C and air humidity up to 95 %
● IEC / EN 60068-2-6 "Fc"
Vibration test
● IEC / EN 60068-2-27 "Ea"
Shock resistance test
Between the tests of compliance with the standards and at the end of the tests, the usability
of the devices is assured with the "Verification of operation characteristics".
Vibration resistance and shock resistance
3VA molded case circuit breakers are insensitive to vibrations and meet the requirements
relating to mechanical and electromechanical vibration strength according to IEC / EN 60068
and the specifications of the shipbuilding societies.
The circuit breakers resist impacts of up to 10 g and are tested to withstand without damage
their operating conditions with shock impact according to IEC / EN 60068-2 27 "Ea" with
150 m/s² / 11 ms.
Installation altitudes
When 3VA1 and 3VA2 molded case circuit breakers are used at up to 2000 m above sea
level, the rated data will not change.
An installation altitude above 2000 m can lead to higher temperatures at the switching
devices. The lower density of air can significantly reduce heat dissipation,
making it necessary to decrease rated operational voltage, the rated uninterrupted current
and the short-circuit values.
Refer to the table below for the calculation factor for determining the key values:
1) At maximum ambient temperature +50 °C
2)
Thermal-magnetic trip units only
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2.5.5
Permissible mounting positions and mounting positions with accessories
The following table shows the possible variations on the mounting positions, as well as
mounting positions with accessories:
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2.5.6
Safety clearances
During a short-circuit interruption, high temperatures, ionized gases and high pressures
occur in and above the arcing chambers of the molded case circuit breaker. For this reason,
defined minimum clearances must be adhered to during installation between the molded
case circuit breakers and the mounting plates, conductor bars and other protection systems
placed in the immediate vicinity. This safety area was successfully confirmed with the help of
tests on test setups according to IEC 60947-2 (perforated grid cage).
Safety clearances are required to:
● allow pressure distribution
● prevent fire or damage caused by any diffused ionized gases
● prevent a flashover to grounded parts
● prevent arcing or short-circuit currents to live sections.
The following safety clearances apply to 3VA molded case circuit breakers with accessories
(e.g. phase barrier, long terminal cover, etc.):
A Minimum clearance between molded case circuit breaker and current paths (uninsulated and
grounded metal), see tables below
B Minimum clearance between molded case circuit breaker and side walls left / right (uninsulated
and grounded metal), see tables below
C
Minimum clearance between two horizontally installed molded case circuit breakers, see tables
below;
applicable to fixed-mounted and plug-in versions (see chapter Plug-in and draw-out technology
(Page 272))
D Minimum clearance between molded case circuit breaker and panel door
E Minimum clearance between live parts of connection technology and grounded mounting plate:
- 3VA10 and 3VA11: 11 mm
- 3VA12, 3VA13 and 3VA14: 8 mm
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Minimum clearance for 3VA1 molded case circuit breakers:
1) Can be used for connection technology: box terminal, screw terminal, internal wire connector and rear terminals
2) Can be used for connection technology: wire connector large, front bus connectors extended, and front bus con-
nectors offset
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1) Can be used for connection technology: box terminal, screw terminal, internal wire connector and rear terminals
2) Can be used for connection technology: wire connector large, front bus connectors extended, and front bus con-
nectors offset
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Minimum clearance for 3VA2 molded case circuit breakers:
1) Can be used for connection technology: box terminal, screw terminal, internal wire connector and rear terminals
2) Can be used for connection technology: wire connector large, front bus connectors extended, and front bus con-
nectors offset
3) Does not apply to breaking capacity class L
Note
In addition to the clearances stated above, any insulation measures that might be required
must also be considered, see chapter Insulating measures (Page 246).
If the molded case circuit breaker is installed in a system whose connection type and
operational voltage does not correspond to the specified insulation measures, a type test is
required.
Description
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It must be ensured that the cable or busbar connector does not reduce the air insulation
clearance.
Accessory components can increase the width or height of the molded case circuit breaker.
In this case the minimum clearances apply from the corresponding sides of the overall
molded case circuit breaker/accessory combination.
NOTICE
Damage to the molded case circuit breaker and the system
Depending on the application, larger minimum clearances may be necessary.
Please observe the specifications regarding air and creepage distances in the applicable
overriding guidelines (e.g. IEC 61439).
Safety clearances between molded case circuit breakers
No minimum clearance needs to be observed between the molded case circuit breakers on
the longitudinal sides (see table above).
The following safety clearances apply to molded case circuit breakers installed directly on
top of each other (for operation in the same network or at the same operational voltage):
x
See tables below for minimum clearance
①
Insulation of cable
②
Insulation of busbar
③
Insulation between the molded case circuit breakers
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Minimum clearance for 3VA1 molded case circuit breakers:
Minimum clearance for 3VA2 molded case circuit breakers:
Maximum clearance to first fixing point of cable or busbar
The figure and table show the recommended maximum clearance between molded case
circuit breakers and the first fixing point of the cable or busbar.
①
Fixing of cable
②
Fixing of busbar
Recommended maximum clearance for 3VA1 molded case circuit breakers:
The values for the 3VA1 molded case circuit breakers are available from Siemens on
request.
Description
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Recommended maximum clearance for 3VA2 molded case circuit breakers:
2.5.7
Arcing spaces
Adequate arcing spaces must be taken into account during planning and installation of the
molded case circuit breakers.
In particular, the following must be observed:
● Ventilation openings must be kept free.
● Ionized gases must not be routed in the direction of connecting terminals or non-insulated
busbars.
● Arcing spaces must not be blocked by busbars installed too close to one another or by
other objects.
The 3VA molded case circuit breakers up to size 630 A have a rotary double-contact system
and therefore blow out upwards and downwards. The upper blowout openings (at
terminals 1, 3, 5) are located above the connections and the lower blowout openings (at
terminals 2, 4, 6) are located below them.
The 3VA molded case circuit breakers in size 1000 A (3VA25) only blow upwards, i.e. in the
direction of terminals 1, 3, 5, as they have a single-contact system.
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2.5.8
Degrees of protection
3VA molded case circuit breakers comply with the following degrees of protection as defined
by IEC 60529 and IEC 60947-1, Annex C:
Degree of protection IP30 is achieved when a 3VA molded case circuit breaker is installed in
a switchboard with a door cutout including cover frame (see below).
Handle and trip unit are freely accessible, the panel door closes flush with the molded case
circuit breaker.
The units can be upgraded to comply with higher degrees of protection up to IP65 by
installation of the following components:
● Door mounted rotary operator
● Side wall mounted rotary operator
2.5.9
Environmental protection
The 3VA1 and 3VA2 molded case circuit breakers meet the specifications of the European
Environment Guideline 2011 / 65 / EU RoHS directive (Restriction of the use of certain
hazardous substances in electrical and electronic equipment). The development and
production processes have been devised to have the lowest possible environmental impact.
Description
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2.6
Protection system
This chapter contains an overview of the protection system of 3VA molded case circuit
breakers.
The topics discussed in this chapter are listed below:
● Description of functions
● Overload protection (L)
● Short-time delayed short-circuit protection (S)
● Instantaneous short-circuit protection (I)
● Ground-fault protection (G)
● Neutral conductor protection (N)
● ZSI - Zone Selective Interlocking
● Guide to setting the tripping characteristic
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2.6.1
Description of functions
The protection function performed by the molded case circuit breaker in the power
distribution network is defined by the choice of trip unit. There are two different types of trip
unit, i.e. thermal-magnetic (TMTU) and electronic (ETU):
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2.6.2
Characteristic curves
To design a low-voltage switchboard in accordance with the valid rules, the system planner
needs to dimension the protection settings of the molded case circuit breakers.
The settings selected for the trip unit of a molded case circuit breaker depend on the type of
equipment to be protected, e.g. switchboard and applications.
Tripping characteristics up to a tripping time of ≥ 1 ms are represented graphically. In order
to ease the coordination of different protection devices, the current is specified as a multiple
of the current setting value and the time is specified in seconds.
Tripping characteristics for thermal-magnetic trip units
Characteristics are displayed graphically in the double-log coordinate system (cf.
IEC 60947-2, paragraph 4.7.4 and IEC 60269-1). The ratio of current to time is 2: 1.
Tripping characteristics for electronic trip units
Characteristics are displayed graphically in the double-log coordinate system (cf.
IEC 60269-1). The ratio of current to time is 1: 1.
①
Response threshold of the long-time delayed
protection, thermal
⑥
Delay of the short-time delayed protection
②
Response threshold of the long-time delayed
protection
⑦
Response threshold of the instantaneous
protection
③
Delay of the long-time delayed protection L Overload range
④
Response threshold of the short-time delayed
protection
S Short-time delayed short-circuit current
range
⑤
I2t characteristic ON/OFF of the short-time
delayed protection
I Instantaneous short-circuit current range
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2.6.3
Guide to setting the tripping characteristic
Supplementary conditions
The settings selected for the trip unit of a molded case circuit breaker depend on the
technical environment (e.g. switchboard and applications) and the type of equipment to be
protected. The task of calculating and dimensioning the protection settings in accordance
with the valid rules is the responsibility of the system planner.
SIMARIS design
The Siemens SIMARIS design software tool is a fast, simple and reliable tool for calculating
and dimensioning networks in accordance with the valid rules:
For further information about SIMARIS design, please visit:
(http://www.siemens.com/simaris)
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Basic rules for setting different trip parameters
Setting the parameters for electronic trip units of the ETU 5-series and 8-series
ETUs 5-series and ETUs 8-series are equipped with an LCD.
Parameter settings can be adjusted via this LCD, values are input by means of buttons. The
powerconfig software can also be used to input parameter settings. The TD500 test device
and the COM800/COM100 breaker data server combined with the COM060 communication
module can be used as the software interface.
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2.6.4
Overload protection (L)
The ID letter for overload protection is L (stands for "Long-time delay").
The trip unit is inverse-time delayed and exhibits the following characteristics depending on
the trip unit type:
● Bimetal characteristic with thermal-magnetic trip units
● I2t characteristic with electronic trip units
The letters Ir refer to the current setting value, and tr to the associated time delay.
The time delay with the device-specific reference point defines the current-dependent curve
shape of the setpoint characteristic. With 3VA molded case circuit breakers, this trip unit
reference point corresponds to 6 times the current setting value Ir. The following
mathematical equation determines the remaining curve of the setpoint characteristic:
I2t = constant
Thermal memory
The electronic trip units feature a thermal memory function that can be deactivated on some
electronic overload releases.
Thermal memory activated (ON)
If the thermal memory is activated, the previous thermal history is taken into account. After
tripping, the thermal memories of the phases are set to a value corresponding to 85% of the
thermal equivalent of the warmest phase. This setting allows reclosure of the contacts of the
molded case circuit breaker. This is followed by a cool-down period according to an
exponential function with a time constant Tau (τ).
Thermal memory deactivated (OFF)
It is the responsibility of the commissioning engineer/operator to provide additional thermal
overload protection for the lower-level power distribution system while the thermal memory is
deactivated.
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2.6.5
Short-time delayed short-circuit protection (S)
The ID letter for short-time delayed short-circuit protection is "S" (stands for "Short-time
delay"). The S function of the trip unit can be used to implement time-selective short-circuit
tripping in low-voltage networks in which multiple molded case circuit breakers are installed
in series.
The short-time delayed short-circuit protection function protects phases L1 to L3 and the
neutral conductor. The protection function responds if the current in at least one phase
exceeds the set tripping current Isd for the set delay period tsd.
The S release has a characteristic curve with current-dependent characteristic I2t, i.e. the
delay time is dependent on the energy content of the short-circuit current present. The ETUs
5-series and ETUs 8-series can be optionally switched over to a current-independent tripping
characteristic. In this case, a fixed delay time tsd applies.
2.6.6
Instantaneous short-circuit protection (I)
The ID letter for instantaneous short-circuit protection is "I" (stands for "Instantaneous").
This short-circuit protection function protects phases L1 to L3. The instantaneous short-
circuit protection function responds if the instantaneous value equal to the rms of the current
in at least one phase exceeds the instantaneous tripping current Ii.
2.6.7
Ground-fault protection (G)
The ID letter for ground-fault protection is "G" (stands for "ground fault").
The G release detects residual currents between phases and grounded, electrically
conductive parts. The ground-fault protection function responds if the ground fault current
exceeds the set tripping current Ig for the set delay period tg.
Ground-fault protection can be implemented either as a current-independent or a current-
dependent function (I2t).
On 4-pole molded case circuit breakers and 3-pole molded case circuit breakers with
external current transformer for the N conductor, the G release calculates the vector sum of
the currents of the three phases and the neutral conductor. On 3-pole molded case circuit
breakers, the vector sum is calculated without the neutral conductor. The G release trips the
circuit breaker, or an alarm is issued via the communication system if the rms value of this
vector sum exceeds the set response threshold Ig for the set delay time tg.
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Ground-fault detection in balanced systems
The three phase currents are evaluated using vectorial summation current.
3VA trip unit variants
● ETUs 3-series: ETU330 (LIG)
● ETUs 5-series: ETU560 (LSIG)
● ETUs 8-series: ETU860 (LSIG)
3-pole molded case circuit breaker in balanced systems:
Ground-fault detection in unbalanced systems
The neutral conductor current is measured directly and in the case of 3-pole molded case
circuit breakers only for the ground-fault protection, but in the case of 4-pole circuit breakers
the neutral conductor current is also evaluated for the neutral conductor protection.
The trip unit calculates the ground-fault current using the three phase currents and the
neutral conductor current for the vectorial summation.
3-pole molded case circuit breaker in unbalanced systems, 3-pole 3VA with external N
transformer:
3VA trip unit variants, 3-pole 3VA2 with external N transformer
● ETUs 5-series: ETU560 (LSIG)
● ETUs 8-series: ETU860 (LSIG)
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For 4-pole molded case circuit breakers, the fourth current transformer is internally installed
for the neutral conductor.
4-pole molded case circuit breaker in unbalanced systems:
3VA trip unit variants, 4-pole 3VA2
● ETUs 3-series: ETU330 (LIG)
● ETUs 5-series: ETU560 (LSIG)
● ETUs 8-series: ETU860 (LSIG)
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2.6.8
Neutral conductor protection (N)
The ID letter for neutral conductor protection is "N".
The neutral conductor protection system protects the neutral conductor against overloads
and short circuits.
The letters IN refer to the current setting value; the associated setting time is identical to tr.
Note
A neutral conductor with full cross sectional area (distributed neutral conductor of the same
size as the phases) is normally protected by the phase protection system and does not
require separate protection.
Neutral conductor protection
Neutral conductor protection must be implemented in accordance with the standards valid in
the country of installation. Possible reasons for implementing neutral conductor overload
protection are:
● The neutral conductor has a smaller cross section than the phase conductors.
● Harmonic levels in the installation are expected to be higher than normal.
● A large number of loads, or predominantly single-phase loads, will be connected.
Neutral conductor protection and 3VA1 molded case circuit breakers
The following 3VA1 molded case circuit breakers have neutral conductor protection:
● All 4-pole versions of 3VA11, 3VA12, 3VA13, 3VA14 (TM210, TM220, TM240)
All of these molded case circuit breakers are available in versions without or with
100% neutral conductor protection. A version with 50% neutral conductor protection is
available in addition for rated operational currents greater than 100 A.
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Neutral conductor protection and 3VA2 molded case circuit breakers
The following versions of 3VA2 molded case circuit breaker have neutral conductor protection:
● All 3-pole versions with external current transformer for N conductor
● All 4-pole versions
The tripping systems of the 5-series and 8-series ETUs enable overdimensioning of the
neutral conductor protection up to 160% of In. This might be necessary to provide protection
against third-order harmonics and multiples thereof.
N Neutral conductor protection
1) At rated operational currents In ≤ 63 A: IN = 40 % … 100 % In
2) Applies to In > 63 A
3) Dependent on circuit breaker size and rated operational current
Parameters of the neutral conductor protection function
● Tripping current IN:
Adjustable as a proportion of the current setting (Ir) for overload protection
● Tripping delay:
Corresponds to the delay setting (tr) for overload protection
● Tripping current of the short-time delayed short-circuit protection:
Corresponds to the short-time delayed short-circuit protection (Isd)
● Tripping delay:
Corresponds to the delay setting for short-time delayed short-circuit protection (tsd)
● Instantaneous short-circuit protection:
Corresponds to the tripping current (Ii) for instantaneous short-circuit protection
You will find information about setting options in chapter Line protection applications of 3VA
molded case circuit breakers (Page 110).
Description
2.6 Protection system
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Example of a neutral conductor protection characteristic
①
Response threshold of the neutral conductor protection
②
Response threshold of the long-time delayed protection
Adjustment of neutral conductor protection settings
The tripping current IN can be adjusted:
● for ETU 3-series via rotary selector switches
● for ETUs 5-series and 8-series
– via the buttons on the ETU display
– via a PC using powerconfig
Description
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2.6.9
Zone selective interlocking (ZSI)
Microprocessor-controlled, zone selective interlocking (ZSI) has been developed in order to
control the total breaking time in low-voltage networks with multiple molded case circuit
breakers connected in series.
Regardless of the number of series-connected molded case circuit breakers, all short circuits
in the network can be cleared within a maximum time period of 50 ms.
Note
Backward compatibility
The ZSI function of the 3VA molded case circuit breakers is compatible with the ZSI function
of the Siemens 3WL air circuit breakers.
Description
2.6 Protection system
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Operating principle
The diagram below illustrates the operating principle of zone selective interlocking:
- - - Communication cable ti "Virtual" tripping time of I protection
A Output, transmits the blocking signal tSD Delay time setting of S protection
E Input, receives the blocking signal tZSI Delay time of all molded case circuit breakers
which detect the short circuit but do not receive
a blocking signal when ZSI is activated
The ZSI function acts on the S and G ranges of the tripping characteristic. Currents within
the I range (instantaneous short circuit) continue to cause instantaneous tripping.
Description
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Fault 1
If the short-circuit current is sufficiently large, the trip units of molded case circuit breakers
Q41, Q33, Q22 and Q11 are activated. Since Q41 clears the fault within ti = 10 ms, none of
the other molded case circuit breakers trips even though Q41 has no ZSI and cannot
therefore transmit a blocking signal to Q33.
Fault 2
If the short-circuit current is sufficiently large, the trip units of molded case circuit breakers
Q32, Q22 and Q11 are activated. As a result of the ZSI function, Q32 temporarily blocks Q22
which in turn temporarily blocks Q11. Depending on the magnitude of the short-circuit
current, the fault is cleared either within ti = 10 ms or tzsi = 50 ms.
Fault 3
Q22 signals short-circuit protection to Q11 with the result that only Q22 trips when delay time
tzsi = 50 ms expires. Without the ZSI function, the fault would not be cleared until tsd = 200 ms
had expired.
Fault 4
The short circuit is detected only by Q11. Since Q11 does not receive a blocking signal from
the downstream molded case circuit breakers, it trips after tzsi = 50 ms. Without the ZSI
function, Q11 would not trip until tsd = 300 ms had expired.
It is especially important to minimize breaking times when short circuits involving very high
short-circuit currents occur.
Description
2.7 Thermal-magnetic trip unit
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2.7
Thermal-magnetic trip unit
A thermal-magnetic trip unit consists of a thermal trip unit for protecting against overload,
and a magnetic trip unit for protecting against short circuits. Both trip units are series-
connected.
2.7.1
Thermal trip unit (L)
The thermal trip unit consists of a temperature-dependent bimetal that heats up as a result of
the flow of current. This means the trip unit is current-dependent. The temperature rise in the
bimetal strip depends not only on the current magnitude, but also on the ambient
temperature of the molded case circuit breaker. All current values specified for thermal-
magnetic trip units of 3VA circuit breakers refer to an ambient temperature of +50 ℃.
2.7.2
Magnetic trip unit with short-circuit protection (I)
The magnetic trip unit with short-circuit protection comprises a yoke mounting through which
a current path runs, and a flap armature that is kept at a distance from the yoke mounting by
a tension spring.
If a short-circuit current flows along the current path, the magnetic field thus generated
causes the flap armature to be moved towards the yoke mounting against the opposite force
of the tension spring. The tripping time is almost current-independent and instantaneous.
The flap armature releases the breaker mechanism and thus opens the switching contacts.
Immediately after tripping, the flap armature is moved back to its starting position by the
restoring force of the tension spring.
Description
2.7 Thermal-magnetic trip unit
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2.7.3
Application cases and trip unit types
The table below illustrates the applications for which different types of thermal-magnetic trip
units can be used:
1) For 4-pole molded case circuit breakers only, available without protection, 50% (≥ In 100 A) and
100%
Description
2.8 Electronic trip unit
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2.8
Electronic trip unit
An electronic trip unit is based on the following concepts:
● Complete measurement of the current in the phases L1, L2 and L3, with N and currents
to ground optional
● Rogowski coil
– Very precise measurement of the current
– Better ground-fault protection because the vectorial sum is more exact
● Evaluation of the current measurement values and constant comparison with the tripping
limits
● Tripping by means of a maglatch
①
Electronic trip unit (ETU)
②
Maglatch
③
Current sensor
Description
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ETU protection against overtemperature
The ETUs are equipped with a temperature sensor for their own protection. This effectively
protects the electronic components of the ETU against irreparable damage.
This protection takes effect in two stages:
● The first stage is an alarm which is indicated by LEDs directly on the ETU. This alarm is
activated when the temperature reaches 90% of the maximum permissible temperature. It
is automatically reset when the temperature falls below the activation limit.
With 5-series and 8-series ETUs, this alarm can also be transmitted to a higher-level
control system via the communication system.
● The second stage immediately opens the 3VA2 molded case circuit breaker when the
maximum permissible temperature is exceeded in the ETU.
The molded case circuit breaker cannot be switched back on until the temperature falls
below approx. 95% of the maximum permissible temperature.
The temperature values of this temperature sensor do not allow any conclusions to be drawn
about the temperature changes of other components within the circuit breaker, e.g. the
circuits.
Note
The customer may perform insulation tests on the main circuits and the neutral conductor
with test voltages up to 4 kV DC and surge voltages up to 14.5 kV.
Description
2.8 Electronic trip unit
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2.8.1
Connections
The connections on the ETU are illustrated in the diagram below:
①
Interface for an external current transformer for N conductor
②
Interface for connection of an EFB300 external function box
③
Interface for connection of an RCD820 residual current device
④
Connection for test devices TD300 and TD500
Description
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2.8.2
Protection functions
1) Available in a version with external current transformer for N conductor or 4-pole breaker
Description
2.8 Electronic trip unit
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1) Available in a version with external current transformer for N conductor or 4-pole breaker
Description
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Description
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2.8.3
Operator controls
The following figure shows the available ETU types of the 3VA2 molded case circuit
breakers. You can decide which ETU to select according to the area of application.
①
Name of the ETU
③
Front interface
⑤
Pushbuttons
②
LED display
④
Rotary selector switches
⑥
LCD
Description
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LED displays
The following table explains what the LED displays mean:
Description
2.8 Electronic trip unit
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Activation limits for ETUs without an external supply
ETUs of the 3-series
3-series electronic trip units are equipped with rotary selector switches. A description of the
operating principle of the rotary selector switches and operating instructions can be found in
chapter Guide to setting the tripping characteristic (Page 73).
Displays on 5-series and 8-series electronic trip units
5-series and 8-series electronic trip units are equipped with an LCD. The displayed values
are refreshed once per second.
Note
The backlighting of the LCD is only active with an external voltage supply (e.g. COM060,
EFB300, 24 V module).
Description
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The following table explains what the symbols in the display mean:
The following table explains what functions are performed by the buttons next to the display:
Displays on 5-series and 8-series electronic trip units
The basic structure comprises the following displays:
● Standard display
● Alarm display
● Measured value display
● Parameter display
If no selection is made within an adjustable time period, the standard display will appear.
Description
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Description
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Standard display
Alarm display
Active alarms are displayed consecutively in screens AV1 … AV5. If no alarms are active,
these screens are concealed.
Description
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Measured value display
The table below explains the measured value display:
Description
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Parameter display
The table below explains the parameter display:
Description
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Setting and changing parameters
1. Use the arrow keys to navigate to the correct display.
2. Press the <OK> button.
→ Edit mode is active. Activation is confirmed by display of "pencil" symbol.
3. Use the arrow keys to adjust the parameter setting.
4. Confirm the setting with the <OK> button, or cancel the operation with <ESC>.
→ The setting is accepted with <OK>. The parameter display now appears.
"Tripped" display
After the ETU has initiated a trip, the "Tripped" display automatically appears:
This screen can be identified by the word "Trip" which is displayed in the top, right-hand
corner. The displayed current value shows the current at the moment of tripping.
Press <ESC> to exit the display.
The additional information contained in the "Tripped" display is explained in the table below:
Description
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Diagnostics display
When a TD500 test device is connected, you can use it to initiate a test. The following
screen appears when a TD500 is connected. The bar flashes at a frequency of 0.5 Hz.
The bar travels from left to right while testing is in progress. The test ends with a trip.
2.8.4
Load acceptance and load shedding - load management
3VA molded case circuit breakers equipped with an ETU 3-series or higher series provide
two current thresholds for the purpose of implementing a local load management function.
Load shedding is the upper threshold, and load acceptance the lower threshold.
①
Incoming alarm "load shedding"
⑤
Parameter load acceptance 100 A
②
Outgoing alarm "load shedding"
⑥
Incoming alarm "load acceptance"
③
Parameter load shedding 400 A
⑦
Outgoing alarm "load acceptance"
④
Current in one phase
Note
No trip
Tripping is never initiated as a result of the current value crossing the upper or lower
thresholds.
Description
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If the current in one phase exceeds the parameter setting for "load shedding" for longer than
delay time tx, an incoming alarm "load shedding" is generated. Only when the current in all
three phases drops below this threshold is an outgoing alarm "load shedding" generated.
The incoming and outgoing alarms can be output via an optional EFB module and
transferred via the communication link.
The opposite applies for the load acceptance threshold. If the current in all three phases
drops below the parameter setting, an incoming alarm "load acceptance" is generated. If
only one of the three currents exceeds the parameter setting, an outgoing alarm "load
acceptance" is generated.
To prevent these alarms being generated by brief current peaks and troughs, they can be
delayed by the time tx from 1 s to 15 s.
powerconfig is used for parameterization.
2.8.5
Measuring with a Rogowski coil
The Rogowski coil is a toroidal coil without a ferromagnetic core. It is used as a component
in electronic measuring devices to measure alternating current.
Advantages of the current sensor:
● Each transformer can be optimized for its task and operating points
– Transformers for power generation
– Transformers for measurement
● Higher accuracy of current measurement and therefore higher accuracy for ground-fault
currents
A power measurement is made possible by the more exact and more linear measurement of
the current together with the integrated voltage tap in the molded case circuit breaker.
Description
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Accuracy levels of the specified measured values of the 8-series ETU, including the
integrated current sensors
Ib is the maximum current in the relevant size. Example: 3VA21 → Ib = 160 A
Un refers to the nominal voltage of the metering function, between phase and neutral
All specified accuracies refer to an ambient temperature of 23 °C ± 2 °C
Interpretation of measured values
PF Power factor
Measured current and voltage values are always positive.
Description
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The "normal" direction of energy flow of the 3VA molded case circuit breaker is top down
(can also be adjusted using the powerconfig software), corresponding to operation in
quadrants Q1 and Q4. If the molded case circuit breaker is supplied from below, it operates
in quadrants Q2 and Q3.
The following table provides an overview of the setting values:
1)
Depending on ETU version
Value can be read
Value can be edited
Description
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1) Depending on ETU version
Value can be displayed/read
Description
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1) Depending on ETU version
Value can be displayed/read
Description
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Applications
3
3.1
3VA IEC trip units
1)
In positions 9 and 10 of the Article No.
2)
After a short circuit, tripping occurs at 140% of the set instantaneous short-circuit current with a 1-pole load.
FTFM T (thermal trip unit) and M (magnetic trip unit) fixed
ATFM
T (thermal trip unit) adjustable, M (magnetic trip unit) fixed
ATAM
T (thermal trip unit) and M (magnetic trip unit) adjustable
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3.2
Line protection applications of 3VA molded case circuit breakers
The main applications of the circuit breakers as line protection components are:
● In main switchboards to provide protection for cables to subdistribution boards
● In subdistribution boards to provide protection for cables to small distribution boards
● Protection for mixed loads (e.g. machinery, lighting, heating)
The trip units for line protection are designed to provide overload and short-circuit protection
for:
● Cables
● Conductors
● Non-motor loads
Suitable 3VA molded case circuit breakers and trip units
3VA molded case circuit breakers equipped with the following trip units are suitable for use in
line protection:
● 3VA1 breakers with thermal-magnetic trip units
– TMs 2-series (Page 111)
● 3VA2 breakers with electronic trip units
– ETUs 3-series (Page 115)
– ETUs 5-series (Page 131)
– ETUs 8-series (Page 131)
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3.2.1
Variants
3.2.1.1
Thermal-magnetic trip units
Derating
Thermal-magnetic trip units employ a temperature-dependent bimetal to provide overload
protection. The setting values are calibrated at an ambient temperature of +50 °C.
Compensation factors must be applied for ambient temperatures other than +50 °C.
You will find more information and derating factors in chapter Derating and temperature
compensation (Page 628).
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Thermal-magnetic trip unit TM210 LI
Line protection FTFM - function LI
The thermal-magnetic trip unit TM210 has:
● fixed parameter setting Ir for overload protection (L)
● fixed parameter setting Ii for instantaneous short-circuit protection (I)
● With 4-pole versions only: Neutral conductor (N) protection permanently set to 0%, 50%
or 100% Ir depending on version
Parameter TM210:
1) With 4-pole versions only:
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Thermal-magnetic trip unit TM220 LI
Line protection ATFM - function LI
The thermal-magnetic trip unit TM220 has:
● adjustable parameter setting Ir for overload protection (L)
● fixed parameter setting Ii for instantaneous short-circuit protection (I)
● With 4-pole versions only: Neutral conductor (N) protection permanently set to 0%, 50%
or 100% Ir depending on version
Parameter TM220:
1) With 4-pole versions only:
Applications
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Thermal-magnetic trip unit TM240 LI
Line protection ATAM - function LI
The thermal-magnetic trip unit TM240 has:
● adjustable parameter setting Ir for overload protection (L)
● adjustable parameter setting Ii for instantaneous short-circuit protection (I)
● With 4-pole versions only: Neutral conductor (N) protection permanently set to 0%, 50%
or 100% Ir depending on version
Parameter TM240:
1) With 4-pole versions only:
Applications
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3.2.1.2
Electronic trip units
ETUs for line protection applications
The following electronic trip units are suitable for use in line protection applications:
● ETU320 LI
● ETU330 LIG
● ETU340 ELISA; LI
● ETU350 LSI
● ETU550 LSI
● ETU560 LSIG
● ETU850 LSI
● ETU860 LSIG
Applications
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Electronic trip unit ETU320 LI
ETU320 LI 3-pole:
ETU320 LI 4-pole:
Line protection - function LI
The ETU320 electronic trip unit has:
● Adjustable parameter settings Ir and tr for overload protection (L)
● Adjustable parameter setting Ii for instantaneous short-circuit protection (I)
● With 4-pole versions only: Neutral conductor protection (N) which can be deactivated
● Permanently active thermal memory, cannot be deactivated
ETU320 parameters:
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Overload protection L:
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Instantaneous short-circuit protection I:
Neutral conductor protection N:
Applications
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Electronic trip unit ETU330 LIG
ETU330 LIG 3-pole:
ETU330 LIG 4-pole:
Line protection - function LIG
The ETU330 electronic trip unit has:
● Adjustable parameter settings Ir and tr for overload protection (L)
● Adjustable parameter setting Ii for instantaneous short-circuit protection (I)
● Adjustable parameter settings Ig and tg for ground-fault protection (G)
● With 4-pole versions only: Neutral conductor protection (N) which can be deactivated
● Permanently active thermal memory, cannot be deactivated
ETU330 parameters:
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Overload protection L:
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Instantaneous short-circuit protection I:
Ground-fault protection G:
The ground-fault protection cannot be deactivated.
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Neutral conductor protection N:
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Electronic trip unit ETU340 ELISA LI
The 3VA2 molded case circuit breaker with the ETU340 ELISA electronic trip unit has been
specially developed for implementing selectivity with fuses in operational class gG. The
tripping characteristic of the ETU340 ELISA of the 3VA2 molded case circuit breaker exhibits
a similar characteristic to fuses of operational class gG, e.g. LV HRC fuses, across the entire
overcurrent range.
From the selectivity perspective, this ETU340 ELISA is therefore especially suitable for
combination with upstream and downstream fuses.
Thanks to the ELISA function of the ETU340, for example, total selectivity is afforded
between an upstream 3VA2 molded case circuit breaker with a rated current In of just 160 A
and a downstream 100 A LV HRC fuse. This advantageous feature allows users to choose
cheaper circuit breakers and configure additional grading levels more easily in low-voltage
networks.
Applications
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Advantages of 3VA2 molded case circuit breaker with ETU340 ELISA over fuses
● The extensive internal and external accessories of the 3VA2 molded case circuit breaker
can be used.
● When the EFB300 external function box is used, it is possible to output alarms from the
ETU, e.g. reason for tripping overload warning (overload or short circuit).
● Adjustable operating current for the overload release, thereby making it possible to use
smaller cable cross sections
● Selectivity to downstream fuses 1 : 1.6
● Can be closed again immediately after tripping and troubleshooting; no need to stock
replacement fuses
Note
The minimum short-circuit current at the line side I‘‘kmin must be at least 7 times the circuit
breaker's rated current In to trip the molded case circuit breaker after 5 s in compliance with
IEC 60364-4-43, DIN VDE 0100-430.
ETU340 ELISA 3-pole:
ETU340 ELISA 4-pole:
Line protection – function ELISA LI
The ETU340 ELISA electronic trip unit has:
● Simulation of the tripping characteristic of a fuse in a circuit breaker
● Adjustable parameter setting Ir for overload protection (L)
● Increased, fixed parameter setting Ii for instantaneous short-circuit protection (I) –
Ii = 15 x Ir
● With 4-pole versions only: Neutral conductor protection (N) which can be deactivated
● Permanently active thermal memory, cannot be deactivated
Applications
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ETU340 ELISA parameters
Setting values Ir
Setting values Ii
The instantaneous short-circuit protection is permanently set to the highest possible value.
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Setting values IN
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Electronic trip unit ETU350 LSI
ETU350 LSI 3-pole:
ETU350 LSI 4-pole:
Line protection - function LSI
The ETU350 electronic trip unit has:
● Adjustable parameter settings Ir and tr for overload protection (L)
● Adjustable parameter settings Isd and tsd for short-time delayed short circuit protection (S)
● Fixed parameter setting Ii for instantaneous short-circuit protection (I)
● With 4-pole versions only: Neutral conductor protection (N) which can be deactivated
● Permanently active thermal memory, cannot be deactivated
ETU350 parameters:
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Overload protection L:
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Short-time delayed short-circuit protection S:
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Instantaneous short-circuit protection I:
The instantaneous short-circuit protection is permanently set to the highest possible value.
Neutral conductor protection N:
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5-series and 8-series electronic trip units
Parameter input via display unit
With 5-series and 8-series electronic trip units, it is possible to set more parameters and to
scale the selection of parameters more finely than on 3-series trip units.
Parameters are set via the display unit and its buttons. This functionality is available,
however, only if a separate, dedicated power supply is connected to the molded case circuit
breakers.
Potential alternatives for this power supply:
● 24 V supplied externally via:
– EFB300 external function box
– temporarily connected TD300 or TD500 test device
– internal 24 V module
– internal COM060 communication module
● Current flow > 20% In in one of the 3 phases
A description of the parameter display can be found in chapter "Operator controls
(Page 93)".
Additional features of 8-series units
In addition to the features shared with 5-series trip units, 8-series units also offer:
● With three-pole molded case circuit breakers, a voltage tap for each phase and the option
of connecting the potential of the neutral conductor
With four-pole molded case circuit breakers, four internal voltage taps are provided for
measuring the conductor voltages
● Additional measurement of power values (only possible with an external 24 V supply)
Note
In order to avoid the display of small ghost currents (e.g. when the breaker is switched off),
all currents below 5% of rated current are displayed as "0" as standard. This threshold can
be changed using powerconfig.
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Electronic trip units ETU550 LSI and ETU850 LSI
ETU550 LSI 3-pole and 4-pole units:
ETU850 LSI 3-pole and 4-pole units:
Line protection - function LSI
The ETU550 and ETU850 electronic trip units have:
● Adjustable parameter settings Ir and tr for overload protection (L)
● Adjustable parameter settings Isd and tsd for short-time delayed short circuit protection (S)
● Adjustable parameter setting Ii for instantaneous short-circuit protection (I)
● With 4-pole versions: adjustable parameter setting IN for neutral conductor protection (N)
(can be activated optionally with 3-pole versions when an external current transformer is
used for the neutral conductor)
Applications
3.2 Line protection applications of 3VA molded case circuit breakers
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 133
ETU550 / ETU850 parameters (3-pole version):
1)
only 3-pole version with external current transformer for N conductor
ETU550 / ETU850 parameters (4-pole version):
Applications
3.2 Line protection applications of 3VA molded case circuit breakers
3VA molded case circuit breakers with IEC certificate
134 Manual, 03/2019, A5E03603177010-03
Overload protection L:
• Ir Adjustable from 0.4 to 1.0 x In in absolute current values
Ir < 50 A: in steps of 0.5 A
Ir ≥ 50 A: in steps of 1 A
• tr Adjustable from 0.5 to 12 / 15 / 17 / 20 / 25 s (dependent on rated operational
current and frame size)
with a reference point of 6 x Ir.
In steps of 0.1 s
The ETU550 LSI and ETU850 LSI units have a thermal memory; this can be deactivated.
Short-time delayed short-circuit protection S:
• Isd Adjustable from 0.6 to 9 / 10 x In
Isd < 50 A: in steps of 0.5 A
Isd ≥ 50 A: in steps of 1 A
• tsd Adjustable from 0.05 to 0.5 s
with a reference point of Isd = 8 x Ir
in steps of 0.01 s
The curve shape I2t = constant can be deactivated.
Instantaneous short-circuit protection I:
• Ii Sizes 100 A to 400 A:
adjustable from 1.5 to 10 / 12 x In
Size 630 A:
See tables above
in steps of 1 A
Neutral conductor protection N:
The neutral conductor protection function is available only for 3-pole molded case circuit
breakers with external current transformer for N conductor for 4-pole molded case circuit
breakers.
• IN Adjustable in steps of 1 A
3-pole
breakers with external current transformer for N conductor:
In < 63 A: 0.4 to 1.6 x In
In ≥ 63 A: 0.2 to 1.6 x In
4-pole
breakers:
In < 63 A: 0.4 to 1.6 x In
In ≥ 63 A: 0.2 to 1.0 or 1.6 x In
Applications
3.2 Line protection applications of 3VA molded case circuit breakers
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 135
Electronic trip units ETU560 LSIG and ETU860 LSIG
ETU560 LSIG 3-pole and 4-pole units:
ETU860 LSIG 3-pole and 4-pole units:
Line protection - function LSIG
The ETU560 and ETU860 electronic trip units have:
● Adjustable parameter settings Ir and tr for overload protection (L)
● Adjustable parameter settings Isd and tsd for short-time delayed short circuit protection (S)
● Adjustable parameter setting Ii for instantaneous short-circuit protection (I)
● Adjustable parameter settings Ig and tg for ground-fault protection (G)
● With 4-pole versions: adjustable parameter setting IN for neutral conductor protection (N)
optionally available for 3-pole versions
Applications
3.2 Line protection applications of 3VA molded case circuit breakers
3VA molded case circuit breakers with IEC certificate
136 Manual, 03/2019, A5E03603177010-03
ETU560 / ETU860 parameters (3-pole version):
1)
only 3-pole version with external current transformer for N conductor
ETU560 / ETU860 parameters (4-pole version):
Applications
3.2 Line protection applications of 3VA molded case circuit breakers
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 137
Overload protection L:
• Ir Adjustable from 0.4 to 1.0 x In in absolute current values
Ir < 50 A: in steps of 0.5 A
Ir ≥ 50 A: in steps of 1 A
• tr Adjustable from 0.5 to 12 / 15 / 17 / 20 / 25 s (dependent on rated operational
current and frame size)
with a reference point of 6 x Ir.
In steps of 0.1 s
The ETU560 LSIG and ETU860 LSIG units have a thermal memory which can be deactivat-
ed.
Short-time delayed short-circuit protection S:
• Isd Adjustable from 0.6 to 9 / 10 x In
Isd < 50 A: in steps of 0.5 A
Isd ≥ 50 A: in steps of 1 A
• tsd Adjustable from 0.05 to 0.5 s
with a reference point of Isd = 8 x Ir
in steps of 0.01 s
The curve shape I2t = constant can be deactivated.
Instantaneous short-circuit protection I:
• Ii Sizes 100 A to 400 A:
adjustable from 1.5 to 10 / 12 x In
Size 630 A:
See tables above
in steps of 1 A
Ground-fault protection G:
The detection of the ground-fault current is based on a vectorial summation of the phase
currents and the neutral conductor current for 4-pole or 3-pole circuit breakers with an exter-
nal current transformer for the neutral conductor.
• Ig Adjustable from 0.2 / 0.25 / 0.4 / 0.6 to 1.0 x In
in steps of 1 A
• tg Adjustable from 0.05 to 0.8 s
with a reference point of 2 x Ig
In steps of 0.01 s
An alarm threshold IgA between 0.2 to 1 x In can also be set. in steps of 1 A
The current-dependent curve shape I2t = constant can be deactivated.
The ground-fault protection function G can be deactivated.
Applications
3.2 Line protection applications of 3VA molded case circuit breakers
3VA molded case circuit breakers with IEC certificate
138 Manual, 03/2019, A5E03603177010-03
Neutral conductor protection N:
The neutral conductor protection function is available only for 3-pole molded case circuit
breakers with external current transformer for N conductor for 4-pole molded case circuit
breakers.
• IN Adjustable in steps of 1 A
3-pole
breakers with external current transformer for N conductor:
In < 63 A: 0.4 to 1.6 x In
In ≥ 63 A: 0.2 to 1.6 In
4-pole
breakers:
In < 63 A: 0.4 to 1.6 x In
In ≥ 63 A: 0.2 to 1.0 or 1.6 x In
Applications
3.2 Line protection applications of 3VA molded case circuit breakers
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 139
Applications
3.2 Line protection applications of 3VA molded case circuit breakers
3VA molded case circuit breakers with IEC certificate
140 Manual, 03/2019, A5E03603177010-03
3.2.2
Overview of 3VA molded case circuit breakers in line protection applications
1) In 125 A, 160 A: Icu / Ics = 36 kA / 36 kA
2)
Operating cycles C - O
Applications
3.2 Line protection applications of 3VA molded case circuit breakers
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 141
1) In 125 A, 160 A: Icu / Ics = 36 kA / 36 kA
2) Operating cycles C - O
For the rated ultimate short-circuit breaking capacity and rated service short-circuit breaking
capacity with direct current, see chapter DC network applications of 3VA molded case circuit
breakers (Page 172) .
Applications
3.2 Line protection applications of 3VA molded case circuit breakers
3VA molded case circuit breakers with IEC certificate
142 Manual, 03/2019, A5E03603177010-03
Applications
3.2 Line protection applications of 3VA molded case circuit breakers
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 143
1) In 400/500 A and In 630 A: Ics = 65 kA
O. r. On request
Applications
3.3 Motor protection applications of 3VA molded case circuit breakers
3VA molded case circuit breakers with IEC certificate
144 Manual, 03/2019, A5E03603177010-03
3.3
Motor protection applications of 3VA molded case circuit breakers
The main applications for motor protection are:
● The 3VA molded case circuit breaker as a starter protection circuit breaker
● The 3VA2 molded case circuit breaker as a motor protection breaker
Overview of possible uses of the 3VA molded case circuit breaker for motor protection:
All 3VA molded case circuit breakers are suitable for use with IE3 motors and, in future, also
with IE4 motors.
Applications
3.3 Motor protection applications of 3VA molded case circuit breakers
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 145
3.3.1
3VA molded case circuit breakers for starter protection
When the 3VA molded case circuit breaker is used as a starter protection circuit breaker, the
3VA only takes on the short-circuit protection function of the motor feeder. The overload
protection of the motor feeder is provided by an overload relay, such as 3RB, or by a motor
management device, such as SIMOCODE.
Functional switching is performed by the contactor.
Two different device ranges are available for starter protection applications:
● 3VA1 starter protection circuit breaker with a magnetic trip unit for standard motor feeders
with a rated conditional short-circuit current Iq up to 100 kA
● 3VA2 starter protection circuit breaker with electronic trip unit for high-end motor feeders
with a rated conditional short-circuit current Iq up to 150 kA
You will find the tested device combinations in the Siemens Industry Online Support
(https://support.industry.siemens.com/cs/ww/en/view/109483387).
The short-circuit release of the TM110M magnetic trip unit is not adjustable. In this case the
short-circuit release is permanently set to 16 times the rated current In.
Applications
3.3 Motor protection applications of 3VA molded case circuit breakers
3VA molded case circuit breakers with IEC certificate
146 Manual, 03/2019, A5E03603177010-03
Setting values of the TM110M magnetic trip unit for the 3VA1 molded case circuit breaker:
Setting values of the TM120M magnetic trip unit for the 3VA1 molded case circuit breaker:
Applications
3.3 Motor protection applications of 3VA molded case circuit breakers
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 147
Setting values of the ETU310M electronic trip unit for the 3VA2 molded case circuit breaker:
Applications
3.3 Motor protection applications of 3VA molded case circuit breakers
3VA molded case circuit breakers with IEC certificate
148 Manual, 03/2019, A5E03603177010-03
3.3.2
3VA molded case circuit breakers for motor protection
The 3VA2 molded case circuit breakers for motor protection are designed for optimal
protection and direct-on-line starting of three-phase squirrel-cage motors.
Possible uses
● 3VA2 motor protection circuit breaker up to 500 A, tested according to IEC EN 60947-4-1
● 3VA2 motor protection circuit breaker as motor protection combination, 3VA2 with 3RT
Overview of possible uses of the 3VA2 molded case circuit breaker for motor protection:
Applications
3.3 Motor protection applications of 3VA molded case circuit breakers
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 149
3.3.2.1
3VA2 motor protection circuit breaker up to 500 A, tested according to
IEC EN 60947-4-1
As the 3VA2 molded case circuit breakers have been tested according to standard
IEC EN 60947-4-1 (as motor starters), these devices can also be used as motor protection
circuit breakers without an additional contactor. In this case the 3VA2 motor protection
breaker takes on the short-circuit protection and overload protection functions in addition to
functional switching (ON/OFF) of the motor.
However, as functional switching of the motor according to utilization category AC-3 reduces
the electrical service life of the circuit breaker, this use is only suitable for applications with a
low switching frequency. The maximum adjustable rated current of the circuit breaker is also
restricted by the increased AC-3 requirements.
Dependence of motor protection circuit breaker on motor size and electrical service life
1) Guide value for 4-pole standard motors at 400 V AC, 50 Hz. Selection depends on the specific startup and rated
data of the protected motor
2) Rated conditional short-circuit current:
• lq = 55 kA - circuit breaker with medium breaking capacity M
• lq = 85 kA - circuit breaker with very high breaking capacity C
Applications
3.3 Motor protection applications of 3VA molded case circuit breakers
3VA molded case circuit breakers with IEC certificate
150 Manual, 03/2019, A5E03603177010-03
3.3.2.2
3VA2 motor protection breaker as tested motor protection combination, 3VA2 with 3RT
The 3VA2 motor protection circuit breakers with 3RT contactors and 3RW soft starters were
tested as a motor protection combination for standard applications.
In this case, the 3VA2 molded case circuit breaker takes on the protection functions, short-
circuit protection and overload protection, and the 3RT contactor or the soft starter is
responsible for functional switching (ON/OFF) of the motor.
You will find the tested device combinations in the Siemens Industry Online Portal
(https://support.industry.siemens.com/cs/ww/en/view/109483387).
3.3.2.3
Protection functions of 3VA2 molded case circuit breakers for motor protection
Different trip unit variants are available for the 3VA2 molded case circuit breaker. These vary
according to functionality and protection functions.
Overview of the ETU versions
1) Adjustable tripping times with phase unbalance in firmware version 4.3 and higher.
Applications
3.3 Motor protection applications of 3VA molded case circuit breakers
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 151
Thermal memory
All 3VA2 molded case circuit breakers for motor applications have a "thermal memory" which
takes the pre-loading of the three-phase asynchronous motor into account. The tripping
times of the inverse-time delayed overload releases are only valid for the unloaded (cold)
state.
The pre-loading of the 3-phase motor must be taken into consideration in order to prevent
damage to the motor, e.g. from being frequently switched on without sufficient cooling time.
Principle of operation
All 3VA2 molded case circuit breakers for motor protection have a thermal model of the
motor integrated in the electronic trip unit. This reduces the response time of the molded
case circuit breaker with a thermal memory such that further overloads cannot damage the
motor windings. The motor is switched off within a time limit determined by the thermal pre-
loading, see curve ② in the figure below (response time of the trip unit after overload trip).
An overload may also be the next inrush current of the motor.
After an overcurrent trip, the trip times are reduced according to the tripping characteristic.
A cooling time determined by the size of the motor is required before the motor can be
switched on again. This prevents the motor from being thermally overloaded by a current
after an overload trip.
Response time of the trip unit after overload trip:
①
without thermal memory
②
with thermal memory
Applications
3.3 Motor protection applications of 3VA molded case circuit breakers
3VA molded case circuit breakers with IEC certificate
152 Manual, 03/2019, A5E03603177010-03
Protection against phase unbalance
All 3VA2 molded case circuit breakers for motor protection have protection against
unbalanced current loading of the motor. This ensures that the motor is reliably protected
against overheating if a phase failure or major fluctuation of a phase current occurs.
The phase unbalance ratio is calculated from the mean value of the three phases L1, L2 and
L3 and the highest possible phase current deviating from this. If the phase unbalance ratio
exceeds the set value, the circuit breaker trips according to tripping time tunbal.
With ETU350M, the tunbal tripping times are permanently set to 0.7 s for startup and to 4 s for
continuous operation. With ETU550M and ETU860M, the tunbal tripping times for startup can
be set from 0.7 s to 60 s and for continuous operation from 4 s to 420 s. The lowest value is
always set as a factory default.
The adjustable tripping time can be used for operation with soft starters, for 2-phase phase-
angle control or DC braking with soft starters.
Calculation formulas:
lMW Mean value of the three phase currents
li One phase current
With the ETU350M trip unit version, the unbalance ratio is permanently set to 40%.
With the ETU550M and ETU860M trip unit versions, the unbalance ratio can be set freely
between 5% and 50%. The default setting of 40% is set at the factory.
Trip classes TC
The trip class Tc specifies the tripping time Tp for balanced 3-pole loads, starting from the
cold state, with 7.2 times the set current Ir according to IEC EN 60947 4-1. Combinations
with class 10 are normally used.
The trip classes with "E" indicate a narrower tolerance band of tripping time Tp. These trip
classes can also be implemented with the precise electronic trip units of the 3VA2 motor
protection circuit breakers.
Applications
3.3 Motor protection applications of 3VA molded case circuit breakers
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 153
Trip classes of overload protection devices according to IEC 60947-4-1:
1) The overload protection device must trip within these times.
Tripping characteristic for 3-pole symmetrical load:
Applications
3.3 Motor protection applications of 3VA molded case circuit breakers
3VA molded case circuit breakers with IEC certificate
154 Manual, 03/2019, A5E03603177010-03
Blocking protection
The 3VA2 molded case circuit breakers with the ETU860M motor protection trip unit now
have blocking protection integrated in the circuit breaker for the first time.
If the motor is blocked (or if it falls short of the breakdown torque), a high motor current -
almost as high as the starting current but still not as high as a short-circuit current - is
generated. Without blocking protection, it can take up to 30 s or even longer (depending on
the current and TP settings) for the molded case circuit breaker to trip. This results in
unnecessary thermal stress.
Blocking protection is automatically deactivated during startup until the motor reaches
operating speed (tstart).
tstart is equal to tb.
Typical application examples for this include:
● Rock crushers (rock too large or too hard)
● Conveyor belts (transported goods jammed)
1) Adjustable Ib over 0.4 in firmware version 4.3 and higher
2) Adjustable tb over 0.5 s in firmware version 4.3 and higher
Idle running protection
The 3VA2 molded case circuit breakers with the ETU860M motor protection trip unit now
have idle running protection integrated in the circuit breaker for the first time.
When the load on the motor is removed, e.g. when the drive chain or drive belt snaps, the
current falls below the normal motor operational current. The integrated idle running
protection detects this condition, trips and thus shuts down the application.
Applications
3.3 Motor protection applications of 3VA molded case circuit breakers
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 155
3.3.3
ETU350M electronic trip unit
Motor protection - function LSI
The ETU350M electronic trip unit features:
● Adjustable parameter setting Ir for overload protection (L)
● Adjustable parameter setting Isd for short-time delayed short circuit protection (S)
● Fixed parameter setting tsd for short-time delayed short circuit protection (S), tsd = 0.03 s
● Fixed parameter setting Ii for short-circuit protection (I), Ii = 15 x Ir
● Adjustable parameter setting Tc for the trip class
● Fixed parameter setting for phase unbalance of 40%
● Permanently active thermal memory, cannot be deactivated
ETU350M parameters
Applications
3.3 Motor protection applications of 3VA molded case circuit breakers
3VA molded case circuit breakers with IEC certificate
156 Manual, 03/2019, A5E03603177010-03
Setting values for Ir
Setting values for Tc
Setting values for Isd
Applications
3.3 Motor protection applications of 3VA molded case circuit breakers
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 157
Instantaneous short-circuit protection Ii
Short-circuit protection Ii is permanently set to the highest possible value.
Phase unbalance / phase failure:
• Iunbal of current mean value permanently set to 40%
• Iunbal tripping time during startup permanently set to 0.7 s
• Iunbal tripping time during normal operation permanently set to 4 s
Applications
3.3 Motor protection applications of 3VA molded case circuit breakers
3VA molded case circuit breakers with IEC certificate
158 Manual, 03/2019, A5E03603177010-03
3.3.4
5-series and 8-series electronic trip units
Parameter input via display unit
With 5-series and 8-series electronic trip units, it is possible to set more parameters and to
scale the selection of parameters more finely than on 3-series electronic trip units.
Parameters are set via the display unit and its buttons. This functionality is available,
however, only if a separate, dedicated power supply is connected to the molded case circuit
breakers.
Potential alternatives for this power supply:
● 24 V power supply via:
– EFB300 external function box
– temporarily connected TD300 or TD500 test device
– internal 24 V module
– internal COM060 communication module
● Current flow > 20% In in one of the 3 phases
You will find further information on the parameter display in chapter Operator controls
(Page 93).
Additional features of 8-series units
In addition to the features shared with 5-series trip units, 8-series units also offer:
● With three-pole molded case circuit breakers, a voltage tap for each phase and the option
of connecting the potential of the neutral conductor
With four-pole molded case circuit breakers, four internal voltage taps are provided for
measuring the conductor voltages
● Additional measurement of power values (only possible with an external 24 V supply)
Applications
3.3 Motor protection applications of 3VA molded case circuit breakers
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 159
3.3.4.1
ETU550M electronic trip unit
Motor protection - function LSI
The ETU550M electronic trip unit features:
● Adjustable parameter setting Ir for overload protection (L)
● Adjustable parameter setting Isd for short-time delayed short circuit protection (S)
● Fixed parameter setting tsd for short-time delayed short circuit protection (S), tsd = 0.03 s
● Adjustable parameter setting Ii for short-circuit protection (I)
● Adjustable parameter setting Tc for the trip class or tripping time Tp
● Adjustable parameter setting for phase unbalance from 5 to 50% / Off, tunbal
ETU550M setting parameters
Applications
3.3 Motor protection applications of 3VA molded case circuit breakers
3VA molded case circuit breakers with IEC certificate
160 Manual, 03/2019, A5E03603177010-03
Overload protection L:
• Ir Adjustable from 0.4 to 1.0 x In in absolute current values
Ir < 50 A: in steps of 0.5 A
Ir ≥ 50 A: in steps of 1 A
The ETU550M has a permanently activated thermal memory.
Short-time delayed short-circuit protection S:
• Isd Adjustable from 1.2 to 12/15 x In in absolute current values
Ir < 50 A: in steps of 0.5 A
Ir ≥ 50 A: in steps of 1 A
• tsd Permanently set to 0.03 s
Instantaneous short-circuit protection I:
• Ii Adjustable from 3 to 12/15 x In in absolute current values
Ir < 50 A: in steps of 0.5 A
Ir ≥ 50 A: in steps of 1 A
Trip class T
c
or tripping time T
p
:
• Tc Adjustable 10 A / 10E / 20 / 20E / 30
• Tp Adjustable from 3 to 13 / 15 / 25 / 30 s (dependent on rated current)
in steps of 1 s
Phase unbalance I
unbal
• Iunbal Adjustable from 5 to 50% relative to the
mean value of the three phase currents
in steps of 1%
• tunbal tripping time1) during startup Adjustable from 0.7 to 60 s,
default setting 0.7 s
• tunbal tripping time1) during normal operation Adjustable from 4 to 420 s,
default setting 4 s
The phase unbalance function can be deactivated.
1) Adjustable tripping time with phase unbalance in firmware version 4.3 and higher.
Applications
3.3 Motor protection applications of 3VA molded case circuit breakers
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 161
3.3.4.2
ETU860M electronic trip unit
Motor protection - function LSIG
The ETU860M electronic trip unit features:
● Adjustable parameter setting Ir for overload protection (L)
● Adjustable parameter setting Isd for short-time delayed short circuit protection (S)
● Fixed parameter setting tsd for short-time delayed short circuit protection (S), tsd = 0.03 s
● Adjustable parameter setting Ii for short-circuit protection (I)
● Adjustable parameter settings Ig and tg for ground-fault protection (G)
● Adjustable parameter setting Tc for the trip class or tripping time Tp
● Adjustable parameter setting for phase unbalance from 5 to 50% / OFF, tunbal
● Adjustable parameter settings Ib and tb for blocking protection
● Adjustable parameter settings I<< and t<< for idle running protection
Applications
3.3 Motor protection applications of 3VA molded case circuit breakers
3VA molded case circuit breakers with IEC certificate
162 Manual, 03/2019, A5E03603177010-03
ETU860M setting parameters
Applications
3.3 Motor protection applications of 3VA molded case circuit breakers
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 163
Overload protection L:
• Ir Adjustable from 0.4 to 1.0 x In in absolute current values
Ir < 50 A: in steps of 0.5 A
Ir ≥ 50 A: in steps of 1 A
The ETU860M has a permanently activated thermal memory.
Short-time delayed short-circuit protection S:
• Isd Adjustable from 1.2 to 12/15 x In in absolute current values
Ir < 50 A: in steps of 0.5 A
Ir ≥ 50 A: in steps of 1 A
• tsd Permanently set to 0.03 s
Instantaneous short-circuit protection I:
• Ii Adjustable from 3 to 12/15 x In in absolute current values
Ir < 50 A: in steps of 0.5 A
Ir ≥ 50 A: in steps of 1 A
Ground-fault protection G:
The detection of the ground-fault current is based on the vectorial summation of the three
phase currents.
• Ig Adjustable from 0.2 to 1 x In in absolute current values
Ir < 50 A: in steps of 0.5 A
Ir ≥ 50 A: in steps of 1 A
• tg Adjustable from 0.05 to 0.8 s
in steps of 0.01 s
An alarm threshold IgA between 0.2 to 1 x In can also be set; in steps of 1 A
The current-dependent curve shape I2tg = constant can be deactivated.
Ground-fault protection (G) can be deactivated.
Note
An external current transformer for the neutral conductor
cannot
be connected.
Trip class T
c
or tripping time T
p
:
• Tc Adjustable 10 A / 10E / 20 / 20E / 30
• Tp Adjustable from 3 to 13 / 15 / 25 / 30 s (dependent on rated current)
in steps of 1 s
Applications
3.3 Motor protection applications of 3VA molded case circuit breakers
3VA molded case circuit breakers with IEC certificate
164 Manual, 03/2019, A5E03603177010-03
Phase unbalance I
unbal
• Iunbal Adjustable from 5 to 50% relative to the
mean value of the three phase currents
in steps of 1%
• tunbal tripping time1) during startup Adjustable from 0.7 to 60 s,
default setting 0.7 s
• tunbal tripping time1) during normal operation Adjustable from 4 to 420 s,
default setting 4 s
The phase unbalance function can be deactivated.
1) Adjustable tripping times with phase unbalance in firmware version 4.3 and higher.
Blocking protection:
• Ib 1) Adjustable from 0.4 to 10 x In
in steps of 1 A
• tb 2) Adjustable from 0.5 to 10 s
in steps of 0.5 s
Blocking protection can be deactivated.
1) Adjustable Ib over 0.4 in firmware version 4.3 and higher
2) Adjustable tb over 0.5 s in firmware version 4.3 and higher
Idle running protection:
• I<< Adjustable from 0.3 to 0.9 x Ir
in steps of 0.01 s
• t<< Adjustable from 1 to 200 s
in steps of 1 s
Idle running protection can be deactivated.
Applications
3.4 Use of 3VA1 molded case circuit breakers as switch disconnectors
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 165
3.4
Use of 3VA1 molded case circuit breakers as switch disconnectors
Switch disconnectors are deployed as:
● Disconnectors in subdistribution and final distribution boards
● Bus couplers
● Disconnectors for machine groups, e.g. as maintenance and repair breakers
● Operator control and disconnector element for cables, busbars and device groups
● Application as disconnector unit
● Application as main switches
● Isolation of small distribution systems in industrial/commercial buildings
● Disconnection of loads
Switch disconnectors are capable of switching equipment and parts of electrical installations
when they are conducting their operational current under normal operating conditions.
Switch disconnectors do not have overload or short-circuit releases. For this reason, a
molded case circuit breaker or a fuse must be installed upstream of every switch
disconnector. Refer to chapter Upstream protection of switch disconnectors (Page 170).
Compatibility of 3VA switch disconnectors and accessories
3VA1 switch disconnectors have been developed from the 3VA1 molded case circuit breaker
design. Both share the same attributes listed below:
● Sizes
● Dimensions
● Mounting options
● Procedure for installing accessories
This means that a shunt trip can trip the switch disconnectors by remote control, or that the
disconnector can be opened or closed by a side wall mounted rotary operator.
Applications
3.4 Use of 3VA1 molded case circuit breakers as switch disconnectors
3VA molded case circuit breakers with IEC certificate
166 Manual, 03/2019, A5E03603177010-03
Isolating features
A switch disconnector isolates individual circuits or items of equipment so that maintenance
or repair work can be carried out. This is a health and safety requirement.
In compliance with IEC 60947-3, the symbol below is clearly displayed on the front panel of
switch disconnectors:
In accordance with the requirements of the standard regarding isolating function, the 3VA1
switch disconnector features:
● the switch disconnector symbol
● a correctly dimensioned isolating distance in the OFF position
When the switch disconnector handle is in the OFF position, the isolating distance between
the main contacts is guaranteed to meet the requirements stipulated by standards pertaining
to isolating features. This also applies when manual or motor operators installed on the
disconnector are in the OFF position.
Only when the disconnector is in this safe position can it be locked by various methods (e.g.
door mounted rotary operator, motor operator). The 3VA1 molded case circuit breaker
therefore also meets the requirements for disconnector units according to IEC 60204-1 in the
capacity of a switch disconnector.
Applications
3.4 Use of 3VA1 molded case circuit breakers as switch disconnectors
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Making capacity
Switch disconnectors have a predefined rated making and rated breaking capacity. As a
result, loads are reliably switched on and off up to the specified breaking capacity.
Features
Switch disconnectors are primarily designed to conduct uninterrupted current up to the
magnitude of the permissible rated uninterrupted current Iu.
Another important feature of these devices is their rated short-circuit making capacity Icm, as
this defines the capability of the switch disconnector to withstand dynamic and thermal
current loads. Current loads can reach very high values when the switch disconnector makes
on a short circuit. Switch disconnectors are designed to withstand these short-circuit currents
without sustaining damage up to the value of their rated short-circuit making capacity.
Utilization categories for switch disconnectors
Utilization categories are differentiated according to the following criteria:
● The relationship between operational current and rated operational current
● The relationship between operational voltage and rated operational voltage
● Power factor (p.f.)
● Time constant
The utilization category is also identified by a letter:
A - for frequent operation
B - for infrequent operation, e.g. disconnectors which are used only to isolate parts of
electrical installations for maintenance purposes.
It is important to note, however, that the term "frequent operation" does not mean that the
switch disconnector may be used to start up, accelerate or shut down individual motors in
normal operation.
For example, a switch disconnector with a rated operational current Ie of 160 A and a rated
operational voltage Ue of 400 V AC may be used for frequent switching of a mixture of
resistive and inductive loads including moderate overload only if it can conduct a making
current I of 480 A (3 x Ie) and withstand a making voltage U of 420 V AC (1.05 x Ue) with a
power factor of 0.65. This capability corresponds to utilization category AC-22A.
Applications
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I Making current
Ic Breaking current
Ie Rated operational current
U Applied voltage
Ue Rated operational voltage
Ur Recovery voltage
Applications
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3.4.1
Overview of 3VA1 as switch disconnectors
Applications
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3.4.2
Upstream protection of switch disconnectors
Switch disconnectors are not equipped with an integral overload or short-circuit release. For
this reason, a molded case circuit breaker or a fuse must be installed upstream of every
switch disconnector.
The coordination tables given below contain the following information:
● The correct assignment of molded case circuit breakers to the switch disconnectors which
require protection
● The maximum permissible rms short-circuit current kA rms for each combination of
molded case circuit breaker and switch disconnector
Protection of 3VA1 switch disconnectors at 50 / 60 Hz by a 3VA1 molded case circuit breaker
More combinations can be found on the Internet (http://www.siemens.com/3VA-
Documentation).
Applications
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Combinations with other protective devices can be configured at any time by means of
SIMARIS design or using the characteristics maximum let-through energy I2tmax and
maximum let-through current Ic max of the 3VA1 switch disconnector. You will find these
characteristics in the technical product data sheets and in the table in chapter Overview of
3VA1 as switch disconnectors (Page 169).
Note
In the event of a fault, all switching devices in the affected branch must be function-tested
(see Regular maintenance (Page 535)).
Applications
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3.5
DC network applications of 3VA molded case circuit breakers
The main applications for 3VA circuit breakers in DC installations or networks are:
● Public transport systems, e.g. electric cars, underground rail networks and streetcars
● UPS systems
● Photovoltaic systems
● Wind power plants
3VA1 molded case circuit breakers as line protection devices with thermal overload releases
and magnetic trip units with short-circuit protection are suitable for use in DC networks.
Features specific to direct current
Short-circuits are interrupted in DC networks by a method similar to the one applied to high
alternating currents, i.e. by current limiting. A high arc voltage develops in molded case
circuit breakers, which forces a current zero when the arc voltage exceeds the value of the
recovery voltage. The current rise, however, is determined by the time constant and not the
make time or power factor.
Overloads are interrupted by a completely different principle to the method applied in AC
networks. With direct currents, there is no periodic zero crossing and thus also no period of
time without magnetic energy in the circuit during which the conditions for extinguishing the
arc are favorable. The arc is not extinguished until the arc voltage exceeds the line voltage
and the current reduces to zero. In other words, a high arc voltage must be developed in
order to interrupt the direct current.
The rated operational current values are generally the same for DC and AC applications.
With DC applications, the breaking capacity depends only on:
● The arc extinction method used
● The line voltage
Applications
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3.5.1
Variants
The same thermal-magnetic trip units used as line protection devices in AC installations are
also available for protecting DC installations.
However, a correction factor must be applied to the magnetic trip unit.
Example:
3VA1 160 A, TM240 ATAM:
If the switching device is to trip instantaneously in response to an overcurrent of 1200 A, the
parameter Ii for instantaneous short-circuit protection (I) must be set to:
Ii = 1200 A x 0.7 = 840 A.
For further information on trip units and details about setting parameters, please refer to
chapter "Line protection applications of 3VA molded case circuit breakers (Page 110)".
It is not possible to use electronic trip units for this application.
Applications
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3.5.2
Breaking capacity with direct current
Applications
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3.5.3
Recommended circuit configurations for DC systems
GF Ground-fault monitoring
1) Ue > 250 V DC: DC insulating plate is mandatory for sizes 3VA10 and 3VA11 with a non-insulated mounting plate
(see chapter Insulating measures (Page 246))
Note
DC 2-pole (all-pole disconnection), grounded system
The grounded pole must always be assigned to the individual conducting path, so that in the
event of a ground fault there are always two conducting paths in series in a circuit with 3-
pole molded case circuit breakers, and three conducting paths in series in a circuit with 4-
pole molded case circuit breakers.
Applications
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Note
DC 2-pole (all-pole disconnection), non-grounded system
If there is no possibility of a double ground fault occurring, or if any ground fault that does
occur is dealt with immediately (ground-fault monitoring), 500 V will be the maximum
permissible direct voltage. In a non-grounded system, all poles must be disconnected.
Further circuits are available on request.
See also
Insulating measures (Page 246)
Applications
3.6 Applications of the 3VA molded case circuit breaker with frequency converters
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3.6
Applications of the 3VA molded case circuit breaker with frequency
converters
3VA molded case circuit breakers can be used as protective devices in systems using
frequency converters.
Applications of 3VA1 molded case circuit breakers with frequency converters
The 3VA1 thermal-magnetic molded case circuit breakers can be used on the primary or
secondary side of the frequency converter in these applications.
Applications of 3VA2 molded case circuit breakers with frequency converters
The 3VA2 electronic molded case circuit breakers can only be used on the primary side of
the frequency converter in the specified 50/60 Hz frequency range. Higher or lower
frequencies result in major deviations in measured values with the result that the tripping
characteristic cannot be adhered to.
Applications
3.6 Applications of the 3VA molded case circuit breaker with frequency converters
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If the 3VA2 molded case circuit breaker with communication is used, it must be ensured that
only one 24 V DC power supply unit is used in the system. If this power supply unit is
installed on the primary side, the cable must have additional shielding and must be
connected to ground. Interruptions in communication might otherwise occur.
Note
You can find tables of tested protective devices for SINAMICS PM240-2 Power Modules on
the Internet (https://support.industry.siemens.com/cs/ww/en/view/109486009).
Applications
3.7 400 Hz network applications of 3VA molded case circuit breakers
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3.7
400 Hz network applications of 3VA molded case circuit breakers
400 Hz networks are used for:
● Ground power supply systems for aircraft
● On-board electrical systems of marine craft and aircraft
● Other external stations of airports which are protected by uninterruptible power supplies,
e.g. radar installations, data processing equipment, communication systems
It is important to supply the on-board electrical systems of aircraft with a very smooth DC
voltage. This can be generated more easily by 400 Hz power supplies than by 50 Hz
networks. Moreover, the power transmitters (transformers) are smaller and lighter by
comparison with 50 Hz networks, two important arguments for using 400 Hz on-board
electrical systems in aircraft and some marine craft.
Suitable 3VA molded case circuit breakers and trip units
3VA1 molded case circuit breakers equipped with thermal-magnetic trip units TM210, TM220
and TM240 are suitable for use in 400 Hz networks.
Features specific to 400 Hz supplies
The thermal overload release of the 3VA1 molded case circuit breaker comprises a bimetal
through which current flows, causing temperature rise. With currents at 400 Hz frequency,
the temperature rise in the bimetal is higher than at 50 Hz. This is due to eddy-current losses
and the reduction in the available conductor cross section as a result of the skin effect. The
rated operational current must therefore be reduced by 10 % of the value used in 50/60 Hz
applications.
Furthermore, a correction factor must be applied to the magnetic trip unit.
Example:
3VA1 160A, TM240 ATAM:
● Reduction by 10%:
Maximum permissible rated operational current for 400 Hz applications =
160 A x 0.9 = 144 A
● Correction factor 0.7:
If the switching device is to trip instantaneously in response to an overcurrent of 1200 A,
the parameter Ii for instantaneous short-circuit protection (I) must be set to Ii = 1200 A x
0.7 = 840 A.
Applications
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For further information on trip units and details about the setting parameters, please refer to
chapter Line protection applications of 3VA molded case circuit breakers (Page 110).
It is not possible to use electronic trip units for this application.
See also
Temperature compensation for thermal-magnetic trip units TM210, TM220 and TM240
(Page 632)
Applications
3.8 IT system applications of 3VA molded case circuit breakers
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3.8
IT system applications of 3VA molded case circuit breakers
The main advantage of IT systems is that they safeguard continuity of service by electrical
installations and are therefore deployed predominantly in consumer installations where
availability of electrical power is a priority. As a general rule, circuits are interrupted only if
two insulation faults occur simultaneously.
Preferred applications for IT systems are therefore:
● In buildings with rooms used for medical purposes
● When mobile generators are in operation
● In certain industries, e.g.:
– in the chemical industry
– in the oil industry
– in the steel industry
– in mining
The IT system is a low-voltage power supply network with increased failure-safety in the
event of ground faults. In an IT system, live phases are not connected to ground. A ground
fault does not cause system shutdown. IEC 60364-4-41 (VDE 0100-410) therefore requires
insulation monitoring to indicate a fault of this kind. In the unusual event that a fault on the
load side coincides with a second fault on the line side, the full phase-to-phase voltage is
connected across one contact of the breaker. Siemens 3VA molded case circuit breakers for
line protection, whether they are equipped with a thermal-magnetic trip unit or an electronic
trip unit, are suitable for use in IT systems.
Accordingly, the molded case circuit breakers meet the requirements of standard IEC /
DIN EN 60947-2 Annex H up to a maximum voltage (Ue, max.) of 690 V AC.
3.8.1
Selection criteria for 3VA molded case circuit breakers
The circuit breakers are always dimensioned and selected irrespective of the system type in
which they will be deployed.
The circuit breaker is always selected according to the maximum potential short-circuit
current in the IT system. The device is selected in accordance with the relevant Icu values of
the 3VA molded case circuit breaker.
If the system operator ensures that no double ground fault can occur on the input or output
side of the molded case circuit breaker, the breaking capacity of Icu /Ics remains unchanged in
IT systems. If this cannot be ensured, the values in accordance with the standard
IEC 60947-2 Annex H apply for single-pole short circuits.
Applications
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3.8.2
Fault situation
The most critical fault for molded case circuit breakers in ungrounded IT systems is a
double-phase-to-ground fault on the infeed and load ends of the molded case circuit breaker.
If this fault occurs, the entire phase-to-phase voltage is applied across one pole of the
molded case circuit breaker.
①
Ungrounded transformer
②
Molded case circuit breaker
③
Exposed conductive part
RA Contact resistance of exposed conductive part ground
Two faults on the load side - double-phase-to-ground fault
● A fault develops between two phases and an exposed conductive part or ground.
● A voltage of 690 V is applied at the main contacts. This voltage is disconnected by two
breaker poles.
● The molded case circuit breaker is rated for Icu/Ics at 690 V.
One fault on the line side and one fault on the load side (double-phase-to-ground fault)
● Single-pole short circuit, the full phase-to-phase voltage of 690 V is applied to main
contact L3.
● Selection of the molded case circuit breaker according to their suitability as defined in
IEC 60947-2, Annex H.
Applications
3.9 Safety-related applications of 3VA molded case circuit breakers
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3.9
Safety-related applications of 3VA molded case circuit breakers
The 3VA molded case circuit breakers can be used in safety-related applications (up to
Category 2 and PL d according to ISO 13849-1 and SIL 2 according to IEC 62061).
As the molded case circuit breaker has no diagnostic capability, such as mirror contacts, it
cannot be used as a second function channel in the safety function. Neither is is practical to
trip the molded case circuit breaker every time a safety request occurs, as it has to be reset
manually. However it is possible to use the molded case circuit breaker as a "test device
output". When combined with a contactor, this corresponds to Category 2 according to
ISO 13849-1 and can therefore achieve up to PL d. According to IEC 62061, a hardware
fault tolerance (HFT) of 0 can be assumed and up to SILCL 2 can therefore be achieved.
Category 2 can be implemented if the contactor is monitored with the evaluation unit and a
sufficiently prompt fault response (welding of main contacts) takes place in the event of
contactor failure. The molded case circuit breaker is immediately tripped by an undervoltage
release in the event of a fault. It is therefore a single-channel architecture with a specified
fault reaction.
Moreover, the power contactor and the molded case circuit breaker constitute proven
components according to ISO 13849-2.
DANGER
Danger of death due to undetected fault cluster
Undetected fault clusters can result in life-threatening situations in the application.
In order to avoid an undetected fault cluster, the molded case circuit breaker must be tested
after 6 to 12 months at the latest.
Documentary evidence of the tests performed must be kept by the user during the period of
use.
The set delay time has an effect on the maximum response time.
DANGER
Danger of death due to excessively long delay time
The delay time set on the molded case circuit breaker has an effect on the maximum
response time.
The user must ensure that this response time in the event of a fault is sufficiently short
based on the risk assessment.
You can find details and calculation examples in the FAQs on the Internet
(https://support.industry.siemens.com/cs/ww/en/view/40349715). The B10(d) values
(https://support.industry.siemens.com/cs/ww/en/view/109738685) of the 3VA molded case
circuit breakers are also listed there.
Applications
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Accessories
4
4.1
Overview of accessories for 3VA molded case circuit breakers
4.1.1
Accessories groups
A comprehensive range of accessories is available to help you adapt 3VA molded case
circuit breakers to the requirements of the specific application.
The table below indicates which accessories are compatible with particular 3VA molded case
circuit breakers, and which sizes of breakers are compatible with the same accessory:
Accessories
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4.1.2
Possible combinations of of accessories
The tables below indicate the combinability of different accessories. The boxes to the right of
the grey diagonal line indicate whether or not accessories can be combined.
Examples:
Wire connector, 2 cables, and insulating plate offset (green lines in table below):
Common box: contains square sym-
bol
Accessories can be combined
Wire connector, 2 cables, and terminal cover (red lines in table below):
Common box: is empty Accessories cannot be combined
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Accessories
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Accessories
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Accessories
4.2 Internal accessories
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4.2
Internal accessories
4.2.1
Mounting locations on 3VA molded case circuit breakers
The portfolio of internal accessories includes:
● Auxiliary switches
● Alarm switches
● Auxiliary releases
● COM060 communication module
● 24 V module
● Cylinder lock (type Ronis)
The following tables show the alternative mounting locations for internal accessories, which
depend on the size and pole number of the circuit breaker.
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4.2 Internal accessories
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3VA1 molded case circuit breakers:
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3VA2 molded case circuit breakers:
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4.2.2
Auxiliary and alarm switches
The auxiliary and alarm switches for 3VA molded case circuit breakers belong to an
integrated range of accessories. They can be installed in all sizes of all circuit breakers up to
1000 A.
The auxiliary and alarm switches can be very simply snapped into place and connected up in
accessory compartments provided on the front panel of the unit to the left and right of the
handle.
All auxiliary and alarm switches are designed as changeover contacts and therefore provide
a high degree of flexibility for planning and installation purposes.
HQ and HP switches
The switches are available in versions HQ and HP. HQ switches are 7 mm wide, and HP
switches 14 mm wide.
Both switch versions can be combined extremely flexibly in a molded case circuit breaker.
This level of compatibility means that two HQ switches can be optionally installed in place of
one HP switch.
HQ and HP switches have the same functionality, but differ in terms of the following features:
● Connection technology
– HQ: One conductor per contact point
– HP: Two conductors per contact point possible (loop-through)
● Key electrical data
– HQ: max. 250 V; max. 6 A
– HP: max. 600 V; max. 10 A
Individual key electrical data can be found at the end of this chapter.
All HQ switches are also available in an electronics-compatible version (HQ_el).
The electronics-compatible auxiliary switches (HQ_el) are specially optimized for switching
small voltages and currents. They are therefore particularly useful for alarms in the vicinity of
PLC controllers, for example.
Accessories
4.2 Internal accessories
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The diagram below uses the example of an ET200S to illustrate the conventional method of
connecting the electronics-compatible auxiliary switch AUX, the trip alarm switch TAS and
the motor operator MO320 to a distributed I/O unit.
Further information about contact reliability can be found at the end of this chapter.
Auxiliary switches AUX
The purpose of auxiliary switches is to signal the position of the main contacts of the molded
case circuit breaker. The contacts of the auxiliary switch open and close simultaneously with
the main contacts of the molded case circuit breaker.
Leading changeover switches LCS
Leading changeover switches signal the opening of the main contacts with a lead time of
20 ms in advance of circuit breaker trips and can be used for load shedding, for example.
Accessories
4.2 Internal accessories
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Trip alarm switches TAS
Trip alarm switches signal all types of molded case circuit breaker trip, regardless of the
cause of the trip. The trip alarm switches are actuated whenever the molded case circuit
breaker switches to the TRIP position.
Electrical alarm switches EAS
Electrical alarm switches are operated as soon as the main contacts of the molded case
circuit breaker open in the event that the breaker is tripped by the ETU. They indicate the
following conditions:
● Overload L and neutral conductor overload
● Short-circuit S, I
● Ground-fault tripping G
● Residual current device RCD820
The electrical alarm switch is not operated:
● When the breaker is tripped manually
– PUSH TO TRIP
– When the breaker is withdrawn from the plug-in/draw-out socket when the main
contacts are closed
● When activated via an auxiliary release
– Shunt trip STL, STL(EI), STF
– Undervoltage release UVR
– Universal release UNI
Electrical alarm switches are compatible only with 3VA2 molded case circuit breakers
equipped with electronic trip units (ETU).
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Short circuit alarm switches SAS
Short circuit alarm switches signal trips only if they have been initiated by a short circuit.
These events are also indicated on the molded case circuit breaker.
The trip must be reset by deliberate acknowledgement of the fault before the molded case
circuit breaker is switched to ON again.
Short circuit alarm switches are only compatible with 3VA1 molded case circuit breakers. On
breakers equipped with electronic trip units, the short circuit alarm function is performed by
the electronic trip unit (ETU) and the EFB300 external function box.
Accessories
4.2 Internal accessories
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4.2.3
Contact sequence diagrams
Main contacts open Auxiliary contacts open Contacts closed
1) Manual reset by tool necessary after tripping
Automatic reset by motor operator MO320
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4.2.4
Technical specifications of auxiliary and alarm switches
1) Safe separation in the case of side-by-side construction of auxiliary switches and auxiliary releases only up to 440 V
and in systems up to an impulse voltage withstand level of 4 kV
2)
HP switches without adjacent switches; not in mounting locations 11 and 21 up to 690 V
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1) In combination with manual switching operations, but not when motor operators are used
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4.2.5
Auxiliary releases
Auxiliary releases allow remote electrical tripping of the circuit breaker. They can be used to
monitor control or main circuits in order to implement a protective system against accidental
restart following a power failure, for example.
Auxiliary releases therefore perform a main circuit monitoring function in addition to the main
circuit monitoring performed by the trip unit.
Auxiliary releases are extremely easy to install. No tools are required because these 21 mm
wide components are simply snapped into place in the accessory compartments to the left
and right of the handle. The accessories are connected by screw terminals for auxiliary
conductors with a cross-section of up to 1.5 mm2. The terminals are mounted on the front of
the unit for easy access.
The shunt trips are suitable for use in electrical interlocks. An attempt to switch on a circuit
breaker while the interlock voltage is applied to the shunt trip leads to a so-called "no-load
switching operation", i.e. the basic breaker always returns to the TRIP position and the main
contacts never close.
Note
All auxiliary releases are reverse-polarity-protected.
Shunt trip left STL
Shunt trips of type STL can be fitted in the left-hand accessory compartment as an
alternative to an undervoltage release. The units are available with five rated voltages in the
following range:
● 24 to 600 V AC 50/60 Hz
● 12 to 250 V DC
They have a maximum power consumption of 58 VA which is significantly lower than the
power consumption of the flexible shunt trip versions.
Switches (permanent signal) or momentary push-buttons (minimum signal duration 40 ms)
may be used to control shunt trips.
Shunt trip left STL (EI) for electrical interlocks
Shunt trips of the type STL (EI) can be used to implement electrical interlocks between two
molded case circuit breakers. The interlocking auxiliary release prevents short-time contact
between the main contacts during a switch-on attempt.
Shunt trip STL (EI) is available with a rated voltage of 24 V DC.
Accessories
4.2 Internal accessories
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Shunt trips flexible STF
Shunt trips of type STF can be fitted in the left-hand and the right-hand (3VA2 only)
accessory compartment. They are therefore suitable for combining different auxiliary
releases in one switch.
The units are available with six rated voltages in the following range:
● 24 to 600 V AC 50/60 Hz
Due to their design, their power consumption ranges up to maximum 750 VA and is therefore
higher than the power consumption of STL versions.
Undervoltage releases UVR
Undervoltage releases trip the molded case circuit breaker in the event that the rated voltage
fails or drops to between 70% and 35% of its normal value (in compliance with the relevant
standard).
The main contacts of the basic breaker cannot be reclosed until the voltage applied to the
UVR reaches 85% of its rated value. The breaker main contacts cannot close until the UVR
rated voltage reaches this level.
The units are available with rated voltages in the following range:
● 24 to 480 V AC 50/60 Hz
● 12 to 250 V DC
Universal releases UNI
A universal release is a single, 21 mm wide component in which a shunt trip and an
undervoltage release are combined. These are subject to the same tripping conditions as the
individual devices. Both functions can therefore be performed at the same time with a
minimal footprint.
The three available rated voltages are identical in each case for both the shunt trip and the
undervoltage release. These rated voltages are:
● 12 V DC
● 24 V DC
● 48 V DC
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Technical specifications of shunt trips and releases
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Tripping times of shunt trips
Cable length under 20 m at Ue:
Cable length 20 m to 200 m at Ue and max. conductor cross section:
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4.2.6
Time-delay devices for undervoltage releases
Undervoltage releases can also be equipped with external, electronic time-delay control
devices which prevent unintentional tripping in response to brief voltage dips during periods
of disrupted operation.
Time-delay device for UVR with fixed delay setting
The simple time-delay device with fixed delay setting is available for the following voltages:
● 110 V AC and 230 V DC
● 24 V DC
The default delay time is >100 ms as supplied, but can be extended by the customer with the
addition of supplementary capacitors:
The device can be screw-mounted or attached to a 35 mm DIN rail.
You can find a circuit diagram in chapter Circuit diagrams (Page 539) or in the operating
instructions.
4.2.7
COM060 communication module
You can find information about the COM060 communication module in chapter
Communication and system integration (Page 484).
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4.2 Internal accessories
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4.2.8
24 V module
With the aid of the 24 volt module, the ETU electronic trip unit of the 3VA2 molded case
circuit breaker can be permanently activated.
The module is installed in the right-hand accessory compartment and takes up four slots.
The following advantages arise from the use of the 24 V module:
● Activated display even when the circuit breaker is switched off or no current is flowing
through the main circuit.
● Backlighting permanently activated
● Through activation of the ETUs, it is possible to test and change setting parameters (5-
series and 8-series ETUs)
● Faster tripping of the 3VA2 molded case circuit breaker on connecting to a short-circuit by
an already active ETU
There are two connection points available for ground and 24 V DC, making looping through
of the voltage very easy.
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4.3
Connection system
The chapter "Connection technology" contains useful information and provides a
summarized description of the 3VA connection system. It provides a helpful guide to
connecting cables or busbars to a molded case circuit breaker and so helps to ensure the
safety of personnel and material assets. Mistakes which affect the operational safety of
electrical installations can be avoided.
Contents
The chapter discusses the following topics:
● General information about cables and busbars
● Portfolio of connection components for 3VA molded case circuit breakers with
– Front cable connection
– Front busbar connection / cable lug connection
– Rear busbar connection / cable lug connection
● Further connection accessories
4.3.1
General information about cables and busbars
Cables and busbars: Cables
Cable designation and cable classes
A key design feature of a cable is its flexibility. This is primarily determined by the number of
cores inside the cable.
Cable classes as defined by IEC 60228:
①
Class 1 - cable with solid conductor
②
Class 2 - cable with stranded conductors
③
Class 5 - cable with finely stranded conductors
④
Class 6 - cable with a large number of extra finely stranded conductors
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The conductors in class 1 and 2 cables are inflexible conductors, either solid or stranded.
These are used predominantly in applications with low-curvature cable bending radii and in
fixed or inflexible installations.
Flexible conductors of class 5 and class 6 permit greater cable bending radii.
The cable conductors used in low-voltage power distribution installations mainly belong to
classes 1, 2, 5 and 6.
Cables with solid conductors in class 1 used for these applications normally have a cross
section of 16 mm² or less.
Please note: Solid-conductor cables in classes 1 and 2 are smaller in diameter than cables
in classes 5 and 6 even when their cross sectional area is the same. As a result, cables with
the same diameter from different classes may have different connection cross sections.
Solid and stranded sector-shaped conductors are also used.
Compression lugs and wire-end ferrules
Cables are connected by means of compression lugs and wire-end ferrules to the molded
case circuit breaker in order to provide stable, safe connections. These elements help to
make solid connections at the breaker.
The cable is first stripped over the distance L before the compression lug or wire-end ferrule
is attached to the cable.
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The cable must be stripped carefully to ensure that the correct amount of insulating material
is removed. If too much material is removed, it will not be possible to make a secure
connection between the cable and compression lug or wire-end ferrule.
Cable lugs for compression connections compliant with DIN 46235 have ideal heat transfer
characteristics for connecting busbar connectors. By contrast, "Terminal lugs with narrow
palm for switching devices" (designation "SG" for example) must be used to make direct
cable connections in the termination area of the molded case circuit breaker. These terminal
lugs vary in design depending on make. All terminal lugs of this kind with the dimensions
stipulated in standard IEC 60947-1, Annex P are basically suitable.
Cables and busbars: Busbars
In addition to cables, the busbar is also widely used in electrical connections, especially in
panels.
Some of the reasons for using busbars include:
● High-curvature bending radii which are unsuitable for cables of large cross section
● Lack of space
● Heat dissipation, air circulation
● …
Rigid and in some cases flexible busbars are used in the examples of applications listed
above.
Rigid busbars are made of copper or aluminum. Pre-punched aluminum busbars, some of
which are threaded, are often used.
Flexible busbars are chosen for applications which demand a high degree of flexibility and
high-curvature bending radii. These consist of bundles of copper or aluminum strips.
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4.3.2
Portfolio of connection components for 3VA molded case circuit breakers
4.3.2.1
General overview
3VA molded case circuit breakers employ connection technology which is designed to
support uncomplicated and convenient commissioning of the breakers in such a way that all
installation requirements are fulfilled.
To meet this objective, an extensive portfolio of connection components is available.
①
Box terminal
⑨
Bus connectors edgewise
②
Wire connector with control wire tap
⑩
Front bus connectors offset
③
Wire connector
⑪
Front bus connectors extended
④
Wire connector, large, with control wire tap
⑫
Nut keeper kit
⑤
Wire connector, large
⑬
Nut keeper kit, right-angled
⑥
Wire connector, 2 cables, with control wire
tap
⑭
Rear connection stud round
⑦
Wire connector, 2 cables
⑮
Rear connection stud flat
⑧
Wire connector, 6 cables
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Furthermore, the connection accessories (see chapter Further connection accessories
(Page 246)) can be optionally installed to insulate the termination area of the 3VA molded
case circuit breaker and so provide protection against accidental contact. A control wire tap
can be implemented quickly using accessory components which are available by special
order.
①
Terminal cover
⑤
Rear insulating plate, offset
②
Terminal cover, extended
⑥
Phase barriers
③
Terminal cover, offset
⑦
Control wire tap for busbars
④
Insulating plate
⑧
Control wire tap for box terminal
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The table below lists all the main conductor connection systems available for 3VA molded
case circuit breakers and also indicates which type of cables or busbars are compatible
which each connection system. A basic distinction is made between front and rear
connections.
The illustration in the table shows the 3-piece pack for the 3-pole molded case circuit
breaker. All connection systems are also available in 4-piece packs for 4-pole molded case
circuit breakers.
1) A box terminal can be installed at the right-angled nut keeper kit to allow a cable to be connected directly.
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The connection technology for 3VA molded case circuit breakers can be used without
modifications in the following applications:
● On all fixed-mounted versions of molded case circuit breaker
● On all molded case circuit breakers equipped with plug-in technology
● On all molded case circuit breakers equipped with draw-out technology
The connection components described above are identical for fixed-mounted breakers, for
plug-in and for draw-out versions. If additional insulation measures are necessary, there may
be differences between fixed-mounted and draw-out versions.
Connection technology available from or installed at the factory
All 3VA molded case circuit breakers are available as standard with a nut keeper kit (clip-in
nut and clamping screw) at the infeed and load ends.
For units up to size 160 A, a box terminal for direct cable connection can be optionally
selected instead of the nut keeper kit. The box terminal is preassembled and installed at the
factory.
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4.3.2.2
Front cable connection
The diagram below illustrates all the components available for implementing a direct cable
connection at the molded case circuit breaker. The only exception is the box terminal as this
can be used to connect busbars as well as cables.
Connection technology Cables and busbars
①
Box terminal
⑨
Solid conductor, class 1
②
Wire connector with control wire tap
⑩
Stranded conductor, class 2
③
Wire connector
⑪
Flexible conductors, classes 5 and 6
④
Wire connector, large, with control wire tap
⑫
Sector-shaped conductor
⑤
Wire connector, large
⑬
Flexible busbars
⑥
Wire connector, 2 cables, with control
wire tap
⑦
Wire connector, 2 cables
⑧
Wire connector, 6 cables
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Box terminal
The box terminal as a factory-assembled connection can be optionally selected as an
alternative to the nut keeper kit (see chapter Front busbar and cable lug connections
(Page 232)) for all 3VA molded case circuit breakers up to size 160 A. The 3VA breaker is
then shipped with preassembled box terminals.
An auxiliary connection can be implemented using a special control wire tap. For further
information, please refer to chapter Auxiliary conductor terminal (Page 269).
In addition to directly connected cables, flexible busbars can also be connected to box
terminals.
The tables below show all the types and sizes of cable and flexible busbar that can be
connected to a box terminal.
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3VA1 molded case circuit breakers:
1) Cable connection: Maximum current carrying capacity 400 A
Flexible copper busbar: No restrictions
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3VA2 molded case circuit breakers:
1) Cable connection: Maximum current carrying capacity 400 A
Flexible copper busbar: No restrictions
Box terminals can be ordered
● as a pack of 3
● as a pack of 4
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Wire connector with and without control wire tap
The wire connector is available under separate article numbers depending on whether it is
ordered with or without a control wire tap. With the exception of the hole for the control wire
tap, both wire connectors are technically identical, i.e. the same cable cross sections can be
connected to both variants.
Note
All control wire taps offered in the 3VA molded case circuit breaker portfolio are permitted
only up to a maximum current of 15 A.
Suitable cable cross-sections: Cables up to a maximum of 2.5 mm2 can be connected.
The wire connector is an internal component, i.e. it is contained within the external contour of
the molded case circuit breaker. As a result, the size of cable cross section which can be
connected is limited by the geometry of the breaker's termination area.
The tables below show all the types and sizes of cable which can be connected to a wire
connector.
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3VA1 molded case circuit breakers:
1) Copper cable: Maximum current carrying capacity 400 A
Aluminum cable: Maximum current carrying capacity 310 A
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3VA2 molded case circuit breakers:
1) Copper cable: Maximum current carrying capacity 400 A
Aluminum cable: Maximum current carrying capacity 310 A
Wire connector with and without control wire tap can be ordered:
● as a pack of 3
● as a pack of 4
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Wire connector, large, with and without control wire tap
The wire connector, large, is available under separate article numbers depending on whether
it is ordered with or without a control wire tap. With the exception of the hole for the control
wire tap, both wire connectors are technically identical, i.e. the same cable cross sections
can be connected to both variants.
Note
All control wire taps offered in the 3VA molded case circuit breaker portfolio are permitted
only up to a maximum current of 15 A.
Suitable cable cross-sections: Cables up to a maximum of 2.5 mm2 can be connected.
The wire connector, large is an external terminal, i.e. it projects beyond the external contour
of the breaker's termination area. This means that cables with a larger cross-section can be
connected.
The terminal cover extended plus the required assembly materials are supplied as standard
with all wire connectors, large. This is used for insulation and provides degree of protection
IP4x at the front of the molded case circuit breaker and degree of protection IP2x at the
infeed side and load side (see chapter Insulating measures (Page 246)).
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The table below shows all the types and sizes of cable which can be connected to a wire
connector, large.
Wire connector, large with or without control wire tap can be ordered:
● as a pack of 3
● as a pack of 4
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Wire connector, 2 cables, with and without control wire tap
The wire connector, 2 cables, is available under separate article numbers depending on
whether it is ordered with or without a control wire tap. With the exception of the hole for the
control wire tap, both wire connectors are technically identical, i.e. the same cable cross
sections can be connected to both variants.
Note
All control wire taps offered in the 3VA molded case circuit breaker portfolio are permitted
only up to a maximum current of 15 A.
Suitable cable cross-sections: Cables up to a maximum of 2.5 mm2 can be connected.
The wire connector, 2 cables is an external terminal, i.e. it projects beyond the external
contour of the breaker's termination area. The 2-cable capacity of the terminal allows cables
with large cross-sectional area to be connected.
The extended terminal cover plus the required assembly materials are supplied as standard
with all wire connectors, 2 cables. This is used for insulation and provides degree of
protection IP4x at the front of the molded case circuit breaker and degree of protection IP2x
at the infeed side and load side (see chapter Insulating measures (Page 246)).
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The table below shows all the types and sizes of cable which can be connected to a wire
connector, 2 cables.
Wire connector, 2 cables with or without control wire tap can be ordered:
● as a pack of 3
● as a pack of 4
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Wire connector, 6 cables
The distribution wire connector, 6 cables is an external terminal, i.e. it projects beyond the
external contour of the breaker's termination area. It can hold up to 6 cables. One of the six
holes in the terminal can be used to implement a control wire tap.
The terminal cover extended plus the required assembly materials are supplied as standard
with all distribution wire connectors, 6 cables. This is used for insulation and provides degree
of protection IP4x at the front of the molded case circuit breaker and degree of protection
IP2x at the infeed side and load side (see chapter Auxiliary conductor terminal (Page 269)).
The table below shows all the types and sizes of cable which can be connected to a
distribution wire connector, 6 cables.
3VA1 molded case circuit breakers:
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3VA2 molded case circuit breakers:
Distribution wire connectors, 6 cables can be ordered:
● as a pack of 3
● as a pack of 4
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Wire connectors for 3VA25 molded case circuit breaker
The 3VA25 molded case circuit breaker is shipped with a preassembled nut keeper kit. Wire
connectors are also available in 3-pole and 4-pole versions.
An auxiliary connection can be implemented using a special control wire tap. For further
information, please refer to chapter Auxiliary conductor terminal (Page 269).
The table below shows all the types and sizes of cable which can be connected to wire
connectors for the 3VA25 molded case circuit breaker.
The wire connectors for the 3VA25 molded case circuit breaker can be ordered:
● as a pack of 3
● as a pack of 4
Assembly materials for wire connectors and the necessary insulation measure are included
in the scope of supply.
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4.3.2.3
Front busbar and cable lug connections
The diagram below illustrates all the components available for implementing a busbar or
compression lug connection on the front panel of the 3VA molded case circuit breaker.
Connection technology Cables and busbars
①
Bus connectors edgewise
⑤
Busbars
②
Front bus connectors offset
⑥
Flexible busbars
③
Front bus connectors extended
⑦
Compression lugs
④
Nut keeper kit
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Nut keeper kit
With the nut keeper kit, it is possible to connect busbars and compression lugs directly to the
terminal of the 3VA molded case circuit breaker.
An auxiliary connection can be implemented using a special control wire tap. For further
information, please refer to chapter Auxiliary conductor terminal (Page 269).
The table below provides an overview of the minimum sizes of cables and busbars which
can be installed using the nut keeper kit.
Nut keeper kits can be ordered:
● as a pack of 3
● as a pack of 4
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Front bus connectors extended
Bus connectors extended can be installed to connect larger busbars and compression lugs
outside the termination area of a 3VA molded case circuit breaker. The front bus connectors
therefore extend the terminal of the breaker.
All front bus connectors extended are supplied as standard with phase barriers to provide
insulation between individual phases. For further information, please refer to chapter
Insulating measures (Page 246).
An auxiliary connection can be implemented using a special control wire tap. For further
information, please refer to chapter Auxiliary conductor terminal (Page 269).
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The table below provides an overview of the minimum sizes of cables and busbars which
can be installed using front bus connectors extended.
Front bus connectors extended can be ordered:
● as a pack of 3
● as a pack of 4
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Front bus connectors offset
Front bus connectors offset can be installed to connect very large busbars and compression
lugs outside the termination area of a 3VA molded case circuit breaker. Front bus connectors
offset increase the distance between pole centers of the terminals of the molded case circuit
breaker.
Distance between pole centers with front bus connectors offset:
● 3VA10 / 3VA11: 35 mm
● 3VA12 / 3VA20 / 3VA21 / 3VA22: 45 mm
● 3VA13 / 3VA14 / 3VA23 / 3VA24: 70 mm
All front bus connectors offset are supplied as standard with phase barriers to provide
insulation between individual phases. For further information, please refer to chapter
Insulating measures (Page 246).
An auxiliary connection can be implemented using a special control wire tap. For further
information, please refer to chapter Auxiliary conductor terminal (Page 269).
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The table below provides an overview of the minimum sizes of cables and busbars which
can be installed using front bus connectors offset.
Front bus connectors offset can be ordered:
● as a pack of 3
● as a pack of 4
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Bus connectors edgewise
Bus connectors edgewise can be installed to connect large busbars and compression lugs
outside the termination area of a 3VA molded case circuit breaker. The terminal of the
breaker is turned by 90° when bus connectors edgewise are fitted.
All bus connectors edgewise are supplied as standard with phase barriers to provide
insulation between individual phases. For further information, please refer to chapter
Insulating measures (Page 246).
An auxiliary connection can be implemented using a special control wire tap. For further
information, please refer to chapter Auxiliary conductor terminal (Page 269).
The table below provides an overview of the minimum sizes of cables and busbars which
can be installed using bus connectors edgewise.
Bus connectors edgewise can be ordered:
● as a pack of 3
● as a pack of 4
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4.3.2.4
Rear busbar and cable lug connections
The diagram below illustrates all the components available for implementing a busbar or
compression lug connection on the rear panel of the 3VA molded case circuit breaker.
Connection technology Cables and busbars
①
Nut keeper kit, right-angled
④
Busbars
②
Rear connection stud round
⑤
Flexible busbars
③
Rear connection stud flat
⑥
Compression lugs
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Nut keeper kit, right-angled
The right-angled nut keeper kit can be installed to connect busbars and compression lugs
outside the termination area on the rear panel of a 3VA molded case circuit breaker. The
terminal of the molded case circuit breaker is turned by 90° at right angles, allowing the
busbar or compression lug to be connected at the rear.
Note
Right-angled nut keeper kits may only be connected to phases 1, 3 and 5 (top terminals)
owing to the gases expelled by 3VA molded case circuit breakers.
In addition, a box terminal can also be attached to the right-angled nut keeper kit allowing
direct connection of a cable.
All right-angled nut keeper kits are supplied as standard with phase barriers to provide
insulation between individual phases (see chapter Insulating measures (Page 246)).
An auxiliary connection can be implemented using a special control wire tap. For further
information, please refer to chapter Auxiliary conductor terminal (Page 269).
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The table below provides an overview of the minimum sizes of cables and busbars which
can be installed using the right-angled nut keeper kit.
Right-angled nut keeper kits can be ordered:
● as a pack of 3
● as a pack of 4
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Rear connection stud round
The rear connection studs round can be installed to connect busbars and compression lugs
to the rear panel of a 3VA molded case circuit breaker.
The dimensions of rear connection studs are given in the table below:
1)
Width across flats of the supplied lock nut
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Rear connection studs round can be ordered:
● as a pack of 3 (2 short connection studs and 1 long connection stud)
● as a pack of 4 (2 short studs and 2 long studs)
● as a pack of 1 (1 short connection stud)
● as a pack of 1 (1 long connection stud)
Note
In order to achieve degree of protection IP40, terminal covers (flat version) must also be
attached when a rear connection stud round is installed.
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Rear connection stud flat
The rear connection stud flat can be installed to connect busbars and compression lugs to
the rear panel of a 3VA molded case circuit breaker.
The rear connection stud flat can be rotated in steps of 45°, i.e. it can be installed at an angle
of 0°, 45° or 90°:
Note
In order to achieve degree of protection IP40, terminal covers (flat version) must also be
attached when a rear connection stud flat is installed.
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The dimensions of rear connection studs flat are stated in the table below:
Rear connection studs flat can be ordered:
● as a pack of 3 (2 short connection studs flat and 1 long connection stud flat)
● as a pack of 4 (2 short connection studs flat and 2 long connection studs flat)
● as a pack of 1 (1 short connection stud flat)
● as a pack of 1 (1 long connection stud flat)
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4.3.3
Further connection accessories
4.3.3.1
Insulating measures
The portfolio of connection accessories includes a broad range of insulating measures.
The diagram below provides an overview of insulation accessories available for 3VA molded
case circuit breakers.
①
Terminal cover
②
Terminal cover extended
③
Terminal cover offset
④
Insulating plate
⑤
Insulating plate offset:
⑥
Phase barriers
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Phase barriers
Phase barriers provide insulation between the individual phases of the molded case circuit
breaker. They are simply snapped into place on the 3VA molded case circuit breaker.
Phase barriers can be used in combination with the insulating plate and the insulating plate
offset. in order to provide additional insulation from the mounting plate.
Phase barriers are compatible with:
● Box terminal
● Wire connector
● Front bus connectors extended (included in scope of supply)
● Front bus connectors offset (included in scope of supply)
● Bus connectors edgewise (included in scope of supply)
● Nut keeper kit, right-angled (included in scope of supply)
● Other insulation accessories: Insulating plate or insulating plate, offset
Depending on the intended purpose of the phase barriers, they must be snapped into
position in the direction indicated by the arrows below:
①
Front connection
②
Rear connection for right-angled nut keeper kit
③
In combination with insulating plate
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Terminal cover, extended terminal cover, and offset terminal cover
All terminal covers afford degree of protection IP40 at the front of the breaker and degree of
protection IP20 at the infeed and load ends provided that they are correctly installed (cutting
of grille structure).
All terminal covers have a marking on the inside face which can be drilled through before the
cover is installed. A voltage detector can be inserted through this hole to test for safe
isolation.
WARNING
Reduced degree of protection
If a hole is drilled through the terminal cover, degree of protection IP40 is no longer
afforded.
Suitable precautions must be taken to safeguard against any hazards posed by this loss of
protection.
①
Marking for holes
Phase barriers can also be installed on all terminal covers in order to maintain the required
clearances and creepage distances which might be reduced as a result of ionized gas
following a short circuit.
Accessories
4.3 Connection system
3VA molded case circuit breakers with IEC certificate
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Terminal cover
The terminal cover is compatible with:
● Box terminals
● Wire connectors
● Nut keeper kits
The terminal cover is simply snapped into place on 3VA1 breakers, or is snapped into place
and secured with two screws on 3VA2 breakers.
Terminal cover extended
The terminal cover extended always consists of two parts:
①
Rear insulating plate, provides insulation from the panel mounting plate
②
Front half, pushed over the molded case circuit breaker from the front
The insulating plate is fitted to the rear panel of the molded case circuit breaker and then
secured by two screws to the front half of the terminal cover. The terminal cover extended is
also secured by two additional screws to the molded case circuit breaker itself.
The terminal cover extended is compatible with:
● Wire connectors, large (terminal cover extended included in scope of supply)
● Wire connectors, 2 cables (terminal cover extended included in scope of supply)
● Wire connectors, 6 cables (terminal cover extended included in scope of supply)
● Front bus connectors extended
● Bus connectors edgewise
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3VA molded case circuit breakers with IEC certificate
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Terminal cover offset
The terminal cover offset always consists of two parts:
①
Rear insulating plate, provides insulation from the panel mounting plate
②
Front half, pushed over the molded case circuit breaker from the front
The insulating plate is fitted to the rear panel of the molded case circuit breaker and then
secured by two screws to the front half of the terminal cover. The terminal cover offset is also
secured by two additional screws to the molded case circuit breaker itself.
The terminal cover offset is compatible with:
● Front bus connectors offset
Insulating plate and insulating plate offset
In certain cases it may be necessary to provide insulation from the panel mounting plate, see
section "Insulation measures" in chapter Insulating measures (Page 246). The insulating
plates for the 3VA molded case circuit breakers are designed for this purpose.
The insulating plate is fitted to the rear panel of the molded case circuit breaker and can be
installed in combination with phase barriers.
Potential applications:
● Insulating plate:
– Bus connectors extended
– Non-insulated, straight conductors / terminals
● Insulating plate, offset:
– Bus connectors offset
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3VA molded case circuit breakers with IEC certificate
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Side plate for 3VA1 2-pole
CAUTION
Risk of injury
A side plate must be fitted if the side surface at the handle end of a 2-pole 3VA1 breaker
with current rating In > 100 A is freely accessible.
For further information, please refer to Operating Instructions 3ZW1012-0VA10-2AA0.
The article number of the side plate is 3VA9112-0SG20.
DC insulating plate
A DC insulating plate must be installed on 3-pole and 4-pole molded case circuit breakers for
some applications:
● Ue > 415 V AC: For IT system applications and for entry of incoming feeder cables
through the bottom panel of the circuit breaker with non-insulated mounting plate
● Ue > 250 V DC: with non-insulated mounting plate
For further information, please refer to Operating Instructions 3ZW1012-0VA10-0AA0
The article numbers for the DC insulating plates are 3VA9113-0SG10 (3-pole) and 3VA9114-
0SG10 (4-pole)
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Insulating measures
1) The 3VA12 molded case circuit breaker requires a rear insulating plate in the case of infeed from below.
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Insulation requirements for inputs/outputs of the molded case circuit breakers
The insulation requirements are represented by letters in the tables below. These letters
stand for the following insulation accessories:
Legend for insulation measures of molded case circuit breakers 3VA10 to 3VA24
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Note
All the insulation measures represent minimum requirements.
Covers can be replaced with higher-quality covers:
• Insulation measure A can be replaced with D and E
• Insulation measure B can be replaced with D and F
• Insulation measure E can be replaced with D
• Insulation measure L can be replaced with K
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4.3 Connection system
3VA molded case circuit breakers with IEC certificate
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Insulation measures for 3VA11 molded case circuit breaker, 1-pole
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Insulation measures for 3VA10 / 3VA 11 molded case circuit breakers, 2-pole, 3-pole, 4-pole
1) Insulating plate 3VA911.-0SG10 must
always
be used with these systems.
2) This connection type is only permissible for terminals 1 / 3 / 5.
3)
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3VA molded case circuit breakers with IEC certificate
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1) Insulating plate 3VA911.-0SG10 must
always
be used with these systems.
2) This connection type is only permissible for terminals 1 / 3 / 5.
3)
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Insulation measures for 3VA12 molded case circuit breaker
1) This connection type is only permissible for terminals 1 / 3 / 5.
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1) This connection type is only permissible for terminals 1 / 3 / 5.
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Insulation measures for 3VA13 and 3VA14 molded case circuit breakers
1) These terminals are only permissible for connections 1 / 3 / 5.
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1)
These terminals are only permissible for connections 1 / 3 / 5.
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Insulation measures for 3VA20, 3VA21 and 3VA22 molded case circuit breakers
1) This connection type is only permissible for terminals 1 / 3 / 5.
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1) This connection type is only permissible for terminals 1 / 3 / 5.
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Insulation measures for 3VA23 and 3VA24 molded case circuit breakers
1) This connection type is only permissible for terminals 1 / 3 / 5.
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1) This connection type is only permissible for terminals 1 / 3 / 5.
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Legend for insulation measures of 3VA25 molded case circuit breaker
1) Spare part, included in the scope of supply of the terminals below:
• 3VA950.-0JB23
• 3VA950.-0JG23
• 3VA950.-0JB32
• 3VA950.-0JG32
2) Spare part, included in the scope of supply of the terminals below:
• 3VA960.-0JJ43
• 3VA960.-0JC43
3) Included in the scope of supply of the circuit breaker
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Insulation measures for 3VA25 molded case circuit breaker
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Touch protection
Insulated cables and busbars
With insulated cables and busbars that have insulation that reaches inside the termination
area of the 3VA molded case circuit breaker, the unit is classed as finger-safe (IP2X) if it is
also equipped with a terminal cover. This protection is guaranteed only if the unit is installed
and wired correctly.
Non-insulated cables and busbars
With non-insulated cables and busbars, and bus connectors extended or bus connectors
offset, the unit is classed as finger-safe (IP2X) if it is also equipped with an extended or
offset terminal cover. This protection is guaranteed only if the unit is installed and wired
correctly.
External wire connectors
External wire connectors are supplied as standard with a terminal cover extended. The
external wire connectors are classed as finger-safe (IP2X) on condition that the extended
terminal cover is correctly installed.
Accessories
4.3 Connection system
3VA molded case circuit breakers with IEC certificate
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4.3.3.2
Auxiliary conductor terminal
A control wire tap can be implemented easily using components from the 3VA molded case
circuit breaker equipment portfolio.
1) Maximum current carrying capacity 15 A
Note
A maximum current limit of 15 A applies to all control wire taps for 3VA molded case circuit
breakers and must not be exceeded.
The control wire tap must be taken into account when configuring the molded case circuit
breaker. Suitable cable cross-sections: Cables up to a maximum of 2.5 mm2 can be
connected.
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All wire connectors can be ordered with control wire tap under a separate article number.
The wire connector is then supplied with a hole for the control wire tap. A ring terminal can
be installed in this hole. The screw required is supplied.
Control wire tap for box terminal
This control wire tap is inserted in the box terminal with the cable.
The following connections can be selected for the control wire tap:
①
Bare conductor
③
Wire-end ferrule
②
Ring terminal
④
Cable lug (connector)
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3VA molded case circuit breakers with IEC certificate
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Control wire tap for busbar connector
This control wire tap is installed at the 3VA molded case circuit breaker with the busbar.
It can also be installed using:
● Front bus connectors extended
● Front bus connectors offset
● Bus connectors edgewise
● Nut keeper kits, right-angled
The following connections can be selected for the control wire tap:
①
Bare conductor
③
Wire-end ferrule
②
Ring terminal
④
Cable lug (connector)
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4.4
Plug-in and draw-out technology
4.4.1
Introduction
With most applications, 3VA molded case circuit breakers are installed in a fixed position in
switchboards or distribution boards. The breaker is normally secured by mounting screws
directly to the mounting plate or other suitable supporting stays of the panel. The cables or
busbars of the main circuits are connected directly to the 3VA molded case circuit breaker by
various terminals or connectors. A rigid, permanent connection is thus created between the
3VA molded case circuit breaker and the panel.
For certain applications, e.g. cyclic inspections or service, it must be possible to replace the
3VA molded case circuit breakers quickly. To meet this requirement, 3VA molded case
circuit breakers can be converted to plug-in and draw-out units.
The main differences between plug-in units and draw-out units are convenience of operation
and the potential for functional expansion.
Plug-in technology
Plug-in technology is the less expensive and more space-saving of the two solutions. The
3VA molded case circuit breaker is inserted in the appropriate plug-in socket and fitted with
plug-in contacts which make a keyed, friction-locked connection with the corresponding
mating contacts (tulip-type contacts) in the plug-in socket. In this case, the device is plugged
in and withdrawn manually.
Accessories
4.4 Plug-in and draw-out technology
3VA molded case circuit breakers with IEC certificate
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Draw-out technology
Like the plug-in versions, draw-out versions of 3VA molded case circuit breakers are
equipped with plug-in contacts at the main current paths. In addition, side walls including
guide and support bolts are bolted to the sides of the 3VA molded case circuit breakers.
In this case, the mating contacts are in the draw-out socket. This is also equipped with a
guide mechanism via which the molded case circuit breaker is moved into the draw-out
socket by means of a crank handle in order to connect the breaker to the main circuits. The
operator can clearly read from a position indicator whether the breaker is properly connected
to the main circuits or is 100% safely isolated from them (so that it can be withdrawn).
Cable connection
With plug-in and draw-out circuit breakers, the cables or busbars are connected to the plug-
in socket or the draw-out socket. Here, the termination areas are implemented in the same
way as for the molded case circuit breaker. That is, all the connection technology available
for the 3VA molded case circuit breaker is also available in a similar way for the plug-in and
draw-out sockets.
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3VA plug-in and draw-out units
Plug-in and draw-out technology as it is implemented in 3VA molded case circuit breakers is
described below. But 3VA switch disconnectors in MCCB design can also be converted to
plug-in or draw-out technology. The information given below therefore applies analogously to
3VA switch disconnectors.
WARNING
Formation of arcs between contacts and irreparable damage to circuit breakers and
installation
When the 3VA molded case circuit breaker is moved into or out of the socket when the
main contacts are closed (breaker position ON), arcs can form between contacts and result
in irreparable damage to the circuit breaker or the electrical installation, and possibly cause
physical injury to personnel.
Do not move the 3VA molded case circuit breaker into or out of the plug-in socket or the
socket of the draw-out unit unless the main contacts are open, i.e. unless the breaker is in
the OFF position.
Before moving the molded case circuit breaker into or out of the socket, use the handle to
switch it to the OFF position. In order to prevent operating errors, 3VA molded case circuit
breakers are equipped with an autotrip plunger when they are converted to plug-in or draw-
out units. This plunger automatically trips the circuit breaker (breaker position TRIP) and thus
opens the main contacts whenever an attempt is made to move a unit into or out of the
socket when the breaker contacts are closed.
Accessories
4.4 Plug-in and draw-out technology
3VA molded case circuit breakers with IEC certificate
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4.4.2
Overview of variants / products
Installation overview
3-pole and 4-pole 3VA molded case circuit breakers are available in a version for fixed
mounting, as a plug-in version and a draw-out version, as shown in the table below:
Apart from the complete kit for plug-in or draw-out technology, a plug-in or draw-out
"conversion kit" for the 3VA molded case circuit breaker can be ordered as a separate item.
These conversion kits are used to prepare 3VA molded case circuit breakers in advance so
that ready-assembled units are available at short notice in the event that a defective breaker
needs to be replaced.
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4.4.3
General information
With plug-in and draw-out circuit breakers, the cables or busbars are connected to the plug-
in socket or the draw-out socket. The same socket unit is used for the same sizes of both
variants.
The incoming and outgoing feeder ends of the socket unit termination area is designed to
match the relevant 3VA molded case circuit breaker. The major benefit of this design feature
is that all terminal and connection variants of the 3VA molded case circuit breaker are fully
compatible with the corresponding plug-in or draw-out unit. To facilitate the ordering process,
the components used in combination with plug-in and draw-out units have been given
separate article numbers. Furthermore, an optional terminal cover for the molded case circuit
breaker can also be installed as a terminal cover over the plug-in socket or draw-out socket.
The connection systems available for a 3VA rated current version and the sizes of cable or
busbar cross section which are compatible with various connection types are described in
detail in chapter Connection system (Page 211).
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4.4 Plug-in and draw-out technology
3VA molded case circuit breakers with IEC certificate
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4.4.4
Information about installation, built-on and built-in components
Securing plug-in and draw-out units to the mounting plate
Bolts supplied with complete kit
Supplied with each complete kit for plug-in or draw-out technology:
● 4 fastening bolts, metric thread, Phillips pan head
The fastening bolts are used to attach the relevant socket unit to a mounting plate or
supporting stay. Sets of fastening bolts can also be ordered separately as spare parts.
Fastening bolts with an inch thread are also available.
Mounting positions
The permissible mounting positions are described in Chapter Permissible mounting positions
and mounting positions with accessories (Page 60).
See also
Connection system (Page 211)
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4.4.5
Plug-in technology
4.4.5.1
Product description
Applications
The plug-in versions of 3VA molded case circuit breakers are designed for use in complex
applications for which speedy replacement of molded case circuit breakers is a basic
requirement. Plug-in technology can be used, for example, when clear visual evidence of
safe electrical isolation of circuits is essential, e.g. when overhaul work is in progress.
Description
With a plug-in system, the molded case circuit breaker is moved into and out of the plug-in
socket manually.
WARNING
Risk of large magnetic forces in the event of short circuits
Accident hazard posed by short circuit events. The molded case circuit breaker can be
ejected from its socket by the resulting magnetic forces.
The 3VA molded case circuit breaker must be bolted securely in position in the socket. The
complete kit for plug-in technology contains assembly bolts for this purpose.
Accessories
4.4 Plug-in and draw-out technology
3VA molded case circuit breakers with IEC certificate
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A complete kit for plug-in technology contains all the components required to convert the
fixed mounting version of a 3VA molded case circuit breaker or 3VA switch disconnector to a
plug-in version.
A complete kit for plug-in technology contains:
● Plug-in socket
● 4 mounting screws for installing the socket in the panel
● Mounting screws for fixing the molded case circuit breaker in the plug-in socket
– 3-pole version:
2 mounting screws from the scope of supply of the plug-in unit and
2 mounting screws from the scope of supply of the molded case circuit breaker
– 4-pole version:
No additional mounting screws in the scope of supply of the plug-in unit
4 mounting screws from the scope of supply of the molded case circuit breaker
● Plug-in contacts for attachment to the main terminals of the molded case circuit breaker
– 3-pole: 6 plug-in contacts
– 4-pole: 8 plug-in contacts
● Autotrip plunger, labeled "Plug-in"
● 2 screw-mounted terminal covers for the molded case circuit breaker
● Cable cages (see chapter Cable cage (Page 306))
A conversion kit for plug-in technology contains:
● Plug-in contacts for attachment to the main terminals of the molded case circuit breaker
– 3-pole: 6 plug-in contacts
– 4-pole: 8 plug-in contacts
● Autotrip plunger, labeled "Plug-in"
● 2 screw-mounted terminal covers for the molded case circuit breaker
● Cable cages (see chapter Cable cage (Page 306))
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Scope of supply of the 3VA molded case circuit breaker and the 3VA switch disconnector in
molded case circuit breaker design:
● For 3-pole version up to 250 A: 2 assembly bolts
● For 3-pole version up to 630 A: 4 assembly bolts
● For 4-pole version up to 630 A: 4 assembly bolts
①
Plug-in contacts for attachment to the main terminals of the 3VA molded case circuit breaker
②
3VA molded case circuit breaker
③
Screw-mounted terminal cover for the molded case circuit breaker
④
Autotrip plunger
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4.4 Plug-in and draw-out technology
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Terminal covers
As described above, two screw-mounted terminal covers are included in the plug-in socket
complete kit and the plug-in socket conversion kit. These feature molded grips to ease
withdrawal of the molded case circuit breaker from its socket. Since it requires significant
force to remove a molded case circuit breaker from its socket, the plug-in terminal covers are
bolted to the contact unit.
If the termination area of the plug-in socket needs to be protected by terminal covers, a
variety of models of terminal cover are available to order as options for this purpose.
Autotrip plunger
An autotrip plunger is supplied as standard with every complete kit and every conversion kit
for converting a 3VA molded case circuit breaker to plug-in technology. The plunger
performs safety functions in operation.
When a 3VA molded case circuit breaker is converted to a 3VA plug-in unit, this plunger is
installed from the rear of the device and latched. The plunger performs safety functions in
operation. It prevents the molded case circuit breaker from being switched to the ON position
if the breaker is not correctly bolted to the socket. For further information, see also section
"Signal 'Plug-in unit - MCCB correctly bolted to plug-in socket'" in chapter Position signaling
switches (Page 295).
WARNING
Make sure that the autotrip plunger is correctly installed
The molded case circuit breaker cannot be safely moved into or out of the socket without
an autotrip plunger. Insertion and removal in switched-on state (circuit breaker position ON)
can lead to formation of arcs between contacts and can result in irreparable damage to the
breaker and electrical installation as well as physical injuries.
Once installed, the autotrip plunger cannot be dismantled again!
Note the color coding and labels for the autotrip plunger:
• Plug-in technology: Black, labeled "Plug-in"
• Draw-out technology: Grey, labeled "Draw-out"
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4.4 Plug-in and draw-out technology
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Auxiliary circuit connectors
Molded case circuit breakers or switch disconnectors in molded case circuit breaker design
are frequently equipped with internal accessories, e.g. with an auxiliary switch and auxiliary
release. A broad range of internal accessory components is also available for the 3VA
molded case circuit breaker. For further information, please refer to chapter Internal
accessories (Page 191).
To ensure that the electrical connections required by plug-in units can be quickly and safely
disconnected, auxiliary circuit connectors can be installed.
The part of the auxiliary circuit connectors on the circuit breaker side is mounted on the
underside of the molded case circuit breaker using the cable cages and is electrically
connected to the internal accessories. Appropriate openings and cable ducts are provided in
the molded case circuit breaker for routing stranded wires. The plug-in socket half of the
auxiliary circuit connector is inserted in the socket and electrically connected to the
customer's installation.
When the molded case circuit breaker is inserted into the plug-in socket, the internal
accessories in the breaker are quickly connected to the customer's installation without the
use of tools.
Note
Plug-in and draw-out units use different versions of the auxiliary circuit connector. The draw-
out version has a longer, movable telescopic rail because the distance to be bridged in the
draw-out socket is longer.
Further details about auxiliary circuit connectors can be found in chapter Auxiliary circuit
connector (Page 301).
Accessories
4.4 Plug-in and draw-out technology
3VA molded case circuit breakers with IEC certificate
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Position signaling in the plug-in socket
Several position signaling switches (number depends on socket size) can be fitted in the
plug-in socket. Auxiliary switches are capable of signaling "Plug-in unit - MCCB correctly
bolted to plug-in socket" via electrical connections.
For further information, please refer to chapter Position signaling switches (Page 295).
Padlocks for preventing insertion of a molded case circuit breaker
The socket unit can be locked with padlocks to prevent unauthorized insertion of a molded
case circuit breaker during service calls and inspections. Using these locks to prevent
insertion and operation of a molded case circuit breaker helps to protect personnel and the
installation itself. The socket unit of the plug-in socket is equipped with three openings for
padlocks.
Openings for padlocks:
● Up to three padlocks
● Shackle diameter 6 mm to 8 mm / 0.25" to 0.31"
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Benefits of plug-in technology
● Defective molded case circuit breakers can be replaced quickly and easily
● Clear visual evidence of safe electrical isolation of main circuits
● Remote signaling of molded case circuit breaker positions:
– "INSERTED": The 3VA molded case circuit breaker is properly inserted and bolted to
the socket
– "WITHDRAWN": The bolts have been removed and the 3VA molded case circuit
breaker removed
● Plug-in socket can be locked by padlocks to prevent insertion of a molded case circuit
breaker
● Degree of protection IP20 at all termination points
● No grounding required
See also
Locking and interlocking (Page 360)
4.4.5.2
Combination with other accessories
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4.4 Plug-in and draw-out technology
3VA molded case circuit breakers with IEC certificate
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4.4.6
Draw-out technology
4.4.6.1
Product description
Typical applications for draw-out versions of 3VA molded case circuit breakers are
installations in which inspections and overhauls need to be carried out at regular intervals
and, for reasons of safety, clear visual evidence of safe electrical isolation of plant sections
must be provided at short notice so that work can commence. Draw-out versions of 3VA
molded case circuit breakers are also suitable for applications which require that molded
case circuit breakers or switch disconnectors can be replaced very rapidly when necessary.
In the draw-out version, the 3VA molded case circuit breaker is supported by the side walls
of the draw-out unit and can be moved into three defined positions by rotation of a crank
handle. The current breaker position is indicated by the breaker status indicator.
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Defined positions
● CONNECT position: The molded case circuit breaker is connected to the main circuits.
The auxiliary circuits are also electrically connected to the installation via the auxiliary
circuit connectors.
This is the normal operating position of the molded case circuit breaker.
● TEST position: The main circuits are not connected to the installation. The auxiliary
circuits are connected to the installation via auxiliary circuit connectors.
The auxiliary circuits can be function-tested with the breaker in the TEST position even
when the installation itself is not live.
● DISCON position: Neither the main circuits nor the auxiliary circuits are connected to the
installation.
The molded case circuit breaker is electrically isolated.
If the molded case circuit breaker is not in any of these defined positions, the breaker status
indicator displays the word UNBLOCK on a white background. When the breaker is in this
position, its main contacts cannot be closed if the autotrip plunger is correctly installed (see
below).
Move the molded case circuit breaker into a defined position
NOTICE
Gear damage
The following operations will lead to irreparable damage of the draw-out socket gear:
• Molded case circuit breaker is in DISCONNECT position:
Insertion of the crank handle (position indicator changes to UNBLOCK) and
counterclockwise turning of the crank handle toward DISCONNECT.
• Molded case circuit breaker is in CONNECT position:
Insertion of the crank handle (position indicator changes to UNBLOCK) and clockwise
turning of the crank handle toward CONNECT.
In the situations described above, pay attention not to turn the crank handle in the indicated
direction.
Note
If the breaker status indication is CONNECT, TEST or DISCON, the sliding clutch of the
crank gear is engaged and rotation of the crank handle has no effect.
By removing and reinserting the crank handle, it is possible to disengage the gear. The
breaker status indicator will then show UNBLOCK. The molded case circuit breaker can now
be moved to a new position.
1. If the crank handle is inserted in the crankcase, pull it out.
2. Insert the crank handle into the crankcase again.
By removing and reinserting the crank handle, it is possible to disengage the gear.
3. Turn the crank handle until the breaker status indication shows the required position.
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3VA molded case circuit breakers with IEC certificate
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Remove the molded case circuit breaker
NOTICE
Gear damage
The following operations will lead to irreparable damage of the draw-out socket gear:
• Molded case circuit breaker is in DISCONNECT position:
Insertion of the crank handle (position indicator changes to UNBLOCK) and
counterclockwise turning of the crank handle toward DISCONNECT.
• Molded case circuit breaker is in CONNECT position:
Insertion of the crank handle (position indicator changes to UNBLOCK) and clockwise
turning of the crank handle toward CONNECT.
In the situations described above, pay attention not to turn the crank handle in the indicated
direction.
1. Move the molded case circuit breaker into the DISCON position.
The molded case circuit breaker is electrically isolated.
2. To disengage the lock, press the safety lock slide underneath the breaker status
indication downwards as indicated by the arrow.
3. Remove the molded case circuit breaker.
Components of a complete kit for draw-out technology
A complete kit for draw-out technology contains all the components required to convert the
fixed mounting version of a molded case circuit breaker or switch disconnector to a draw-out
version.
● Draw-out socket including side walls with the mechanical components required to guide
the molded case circuit breaker into and out of the socket under the control of a crank
handle
● 4 mounting screws for installing the socket in the panel
● Plug-in contacts for attachment to the main terminals of the molded case circuit breaker
– 3-pole: 6 plug-in contacts
– 4-pole: 8 connectors
● Side walls with guide bolts for mounting on the molded case circuit breaker
● Autotrip plunger, labeled "Draw-out"
● 2 screw-mounted terminal covers for the molded case circuit breaker
● Cable cage (see chapter Cable cage (Page 306))
Note
Information about the crank handle
The crank handle is not supplied as part of the complete kit and must be ordered separately.
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3VA molded case circuit breakers with IEC certificate
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Components of a conversion kit for draw-out technology
● Plug-in contacts for attachment to the main terminals of the molded case circuit breaker
– 3-pole: 6 plug-in contacts
– 4-pole: 8 plug-in contacts
● Side walls with guide bolts for mounting on the molded case circuit breaker
● Autotrip plunger, labeled "Draw-out"
● 2 screw-mounted terminal covers for the molded case circuit breaker
①
Plug-in contacts for attachment to the main terminals of the molded case circuit breaker
②
Side walls with guide bolts for mounting on the molded case circuit breaker
③
Screw-mounted terminal cover for the molded case circuit breaker
④
Autotrip plunger
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Installation instructions
The draw-out socket is permanently mounted in the panel by means of the mounting screws
included in the complete kit for draw-out technology.
The molded case circuit breaker / switch disconnector in molded case circuit breaker design
is supplied with two assembly bolts (3-pole version) or four assembly bolts (4-pole version).
These bolts are not required if the device is to be converted to a draw-out unit.
Terminal cover
Two terminal covers are included in the scope of supply of the complete kit for draw-out
technology and the conversion kit for draw-out technology for the molded case circuit
breaker. These two terminal covers are intended for installation over the molded case circuit
breaker. If terminal covers are to be attached to the busbars of the draw-out socket, they
must be ordered separately, see chapter Insulating measures (Page 246).
Autotrip plunger
An autotrip plunger is supplied as standard with every complete kit and every conversion kit
for converting a molded case circuit breaker to draw-out technology.
WARNING
Make sure that the autotrip plunger is correctly installed
The molded case circuit breaker cannot be safely moved into or out of the socket without
an autotrip plunger. Moving it into or out of the socket when the main contacts are closed
(breaker position ON) can cause arcs to form between contacts and result in irreparable
damage to the circuit breaker or the electrical installation, and possibly cause physical
injury to personnel.
Once installed, the autotrip plunger cannot be dismantled again!
Note the color coding and labels for the autotrip plunger:
• Plug-in technology: Black, labeled "Plug-in"
• Draw-out technology: Grey, labeled "Draw-out"
When a molded case circuit breaker is converted to a molded case circuit breaker for draw-
out technology, the autotrip plunger is installed from the rear of the device and latched.
The plunger performs various safety functions in operation:
● It prevents closure of the main contacts of the molded case circuit breaker when the
breaker is inserted in the draw-out socket and in an undefined position (breaker status
indication is UNBLOCK).
● It allows the breaker to be closed in the defined positions TEST and CONNECT.
● It trips the molded case circuit breaker (TRIP) when the breaker's main contacts are
closed (switching position ON) and an attempt is made to move the breaker out of one of
the three defined positions CONNECT, TEST or DISCON using the crank handle.
Accessories
4.4 Plug-in and draw-out technology
3VA molded case circuit breakers with IEC certificate
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Auxiliary circuit connectors
3VA molded case circuit breakers or 3VA switch disconnectors are frequently equipped with
internal accessories, e.g. auxiliary switches and auxiliary releases. A broad range of internal
accessory components is also available for the 3VA molded case circuit breaker. For further
information, please refer to chapter Internal accessories (Page 191).
To ensure that the electrical connections required by draw-out units can be quickly and
safely disconnected, auxiliary circuit connectors can be installed.
The part of the auxiliary circuit connectors on the circuit breaker side is mounted on the
underside of the molded case circuit breaker using the cable cages and is electrically
connected to the internal accessories. Appropriate openings and cable ducts are provided in
the 3VA molded case circuit breaker for routing stranded wires. The socket-end half of the
auxiliary circuit connector with the movable telescopic rail is inserted in the socket and
electrically connected to the customer's installation.
When the molded case circuit breaker is inserted into the draw-out unit, an electrical
connection between the internal accessories in the breaker and the customer's installation is
quickly established.
Note
Plug-in and draw-out units use different versions of the auxiliary circuit connector.
The draw-out version has a longer, movable telescopic rail because the distance to be
bridged in the draw-out socket is longer.
Further details about auxiliary circuit connectors can be found in chapter Auxiliary circuit
connector (Page 301).
Position signaling in the draw-out socket
Several position signaling switches (number depends on socket size) can be installed in the
right-hand side wall of the draw-out socket. These auxiliary switches are capable of signaling
breaker positions DISCON, TEST and CONNECT. The auxiliary switches also output a
position indication signal if the molded case circuit breaker in the draw-out socket is not in
one of the positions specified above. For information, please refer to chapter Position
signaling switches (Page 295).
Accessories
4.4 Plug-in and draw-out technology
3VA molded case circuit breakers with IEC certificate
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Protection against unauthorized operation of molded case circuit breaker
Padlocks for protection against unauthorized operation
To provide protection against unauthorized operation of the molded case circuit breaker,
padlocks can be inserted through the plastic frame opening of the padlock locking unit on the
right side wall of the draw-out socket. The plastic frame is simple to pull out. The crank
handle opening is mechanically sealed when the plastic frame is in the OUT position.
Openings for padlocks in plastic frame:
● Up to three padlocks
● Shackle diameter 6 mm to 8 mm / 0.25" to 0.31"
Attach padlocks
1. Move the molded case circuit breaker into the CONNECT, TEST or DISCON position.
The breaker must be in one of these positions before the plastic frame can be pulled out.
2. Pull out the plastic frame.
The crank handle opening is sealed off.
3. Insert padlock shackles through the plastic frame and lock padlocks as illustrated above.
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Cylinder lock for protection against unauthorized operation
A cylinder lock can be retrofitted in the right-hand side wall of the draw-out socket. Like the
plastic frame and padlocks, this cylinder lock is capable of locking a molded case circuit
breaker in either the CONNECT, TEST or DISCON position. The cylinder lock utilizes the
locking mechanism of the plastic frame. This is evident from the way the plastic frame moves
into or out of the socket as the cylinder lock is turned.
Signaling of locked/unlocked status
The locked or unlocked status of a draw-out unit can be signaled electrically. This requires
the installation of a position signaling switch (3VA9987-0KB00) in the right-hand side wall of
the draw-out socket. This switch signals whether the plastic frame described above is in the
"IN" or "OUT" position. For further details, refer to chapter Position signaling switches
(Page 295).
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3VA molded case circuit breakers with IEC certificate
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Integration of molded case circuit breaker position signal into a communication network
By means of the COM100 and COM800 breaker data servers, various statuses of multiple
molded case circuit breakers can be queried and passed on by bus systems. This includes
messages such as "Breaker tripped", "Breaker on", "Breaker off", reason for tripping.
Depending on the version of the 3VA molded case circuit breaker, actual current and voltage
measurements can also be passed on. To provide this communications capability, the
molded case circuit breaker itself is equipped with a COM060 communication module which
functions as the breaker's actual communications interface.
In addition to the status information listed above, the position of the molded case circuit
breaker in the draw-out unit can also be transferred. For this purpose, the molded case
circuit breaker and the draw-out socket must be equipped with the communications interface
for the draw-out unit. This kit allows the position of the molded case circuit breaker in the
draw-out unit to be picked up and transferred to the COM060 communication module and
from there to the higher-level communication network. For further information about the
communication kit for draw-out units, please refer to chapter Communications interface for
draw-out unit (Page 300).
Operation through the panel door
The molded case circuit breaker can be optionally installed in the panel in such a way that
the breaker can be operated even when the panel door is closed. Draw-out versions of
molded case circuit breakers can then be switched on or off when the panel door is not
open. This is made possible by a cutout in the panel door which allows access to the main
control elements, i.e the handle and the <PUSH TO TRIP> button of the molded case circuit
breaker, but prohibits access to other live components inside the panel. This solution is
referred to as a "door feedthrough".
Door feedthroughs are mounted on the front of the molded case circuit breaker and securely
attached to the breaker by means of two bolts and a latch.
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The door cutout must be positioned such that it is flush with the door feedthrough. It must
also be positioned in such a way as to minimize the size of the gap between the feedthrough
walls and the cutout. A cover frame can be fitted as well in order to obtain an optimum finish.
An opening in the panel through which the crank handle can be inserted must be provided in
addition to the cutout for the door feedthrough.
With its straight sides, the door feedthrough is designed to allow the molded case circuit
breaker to be moved through positions DISCON, TEST and CONNECT, while at the same
time providing a permanently tight seal around the feedthrough area (degree of protection
IP30) and preventing access to live components inside the panel.
Markings are visible on the door feedthrough to help the user identify the current position of
the molded case circuit breaker as it is moved into or out of the panel. Since mounting
dimensions may vary slightly, however, these markings should be regarded as a rough guide
only. The crank handle mechanism provides the user with feedback information about the
molded case circuit breaker position, e.g. whether it has been correctly inserted.
Benefits of draw-out technology
● Defective molded case circuit breakers can be replaced quickly and easily
● Clear visual evidence of safe electrical isolation of main circuits
● Molded case circuit breaker and accessories can be function-tested in the TEST position
● Remote signaling of molded case circuit breaker positions CONNECT, TEST and
DISCON
● Padlocks and / or cylinder locks can be used to lock draw-out unit so that the molded
case circuit breaker cannot be inserted or removed by unauthorized persons
● Molded case circuit breaker can be operated through the panel door
● Degree of protection IP20 at all termination points
● No grounding required
See also
Locking and interlocking (Page 360)
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4.4.6.2
Combination with other accessories
See also
Locking and interlocking (Page 360)
4.4.7
Accessories for plug-in and draw-out units
4.4.7.1
Description of individual product variants
Position signaling switches
These auxiliary switches are capable of signaling a variety of states via electrical
connections. The position signaling switch is available in only one version.
Applications:
● Signal "Position of breaker in the draw-out unit"
● Signal "Draw-out unit locked / open"
● Signal "Plug-in unit - MCCB correctly bolted to plug-in socket"
The position signaling switches are changeover switches, i.e. they have three connections:
①
NO contact
②
NC contact
③
Common potential contact
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Signal "Position of molded case circuit breaker in the draw-out unit"
Up to three position signaling switches can be integrated in the draw-out unit in order to
transmit breaker position information to monitoring and control systems. They are installed in
the right-hand side wall of the unit at the positions indicated in the diagram below:
①
41a or 41b: Detects position CONNECT
②
42a or 42b: Detects position TEST
③
43a or 43b: Detects position DISCON
Signal "Position of molded case circuit breaker in the draw-out unit"
It is irrelevant whether the position signaling switch is inserted in slot a or b. Only one
position signaling switch per position is usually installed. The remaining free slots can be
used for the signaling switches of the communication link kit or for an additional position
signaling switch.
If the molded case circuit breaker in the draw-out unit is moved into a defined position with
the crank handle, the corresponding position signaling switch outputs a signal that can be
further used electrically, e.g. for visual or acoustic alarm indications.
If the molded case circuit breaker is not in any of the defined positions, the breaker status
indicator displays the word UNBLOCK on a white background. In this position, the molded
case circuit breaker is either off (position OFF, contacts open) or tripped (position TRIP,
contacts open). The breaker main contacts cannot be closed with the breaker in the
UNBLOCK state.
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Depending on the position of the molded case circuit breaker in the draw-out unit, the
outputs of the position signaling switches assume one of the following states:
Signal "Draw-out unit locked / open"
①
Slot for position signaling switch for signal "Draw-out unit locked / open"
②
Plastic frame for padlock locking unit
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Signal "Draw-out unit locked / open"
A position signaling switch to transmit this signal is installed in position 44 of the right-hand
side wall of the draw-out unit.
A position signaling switch in position 44 outputs a signal which indicates whether the
padlock locking unit is in the OUT position, thereby locking the draw-out unit.
The draw-out unit can be locked in the defined breaker positions CONNECT, TEST and
DISCON by padlocks or a cylinder lock (available as retrofit component). The position of the
molded case circuit breaker cannot be changed when the draw-out is locked. In the locked
state, the opening for the crank handle is mechanically sealed and the handle cannot be
inserted.
To lock the unit using padlocks, the padlock locking unit on the draw-out unit must be pulled
out manually so that the shackles of the padlocks can be inserted through the opening.
When the draw-out unit is locked by the cylinder lock, the padlock locking unit moves out
automatically as the cylinder lock is turned because it is mechanically coupled with the
cylinder lock in the draw-out unit. The position of the padlock locking unit ultimately
determines the position of the contacts of the position signaling switch.
Accessories
4.4 Plug-in and draw-out technology
3VA molded case circuit breakers with IEC certificate
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Signal "Plug-in unit - MCCB correctly bolted to plug-in socket"
This option is provided for plug-in units only. Depending on the socket size, up to two
position signaling switches can be installed in slot No. 46.
①
Slot 46 for position signaling switch of the plug-in socket
②
Slot 46 for position signaling switch of the plug-in socket
③
Mechanical system for actuation of position signaling switches when the bolt is tightened
④
Bolt hole which determines the signal output by the position signaling switches
With this application, the position signaling switches indicate whether the molded case circuit
breaker is inserted in the plug-in socket and secured by at least one bolt. The reason for this
application is that the molded case circuit breaker needs to be secured in position by
mounting screws in the plug-in socket. The four mounting screws supplied with the complete
kit for plug-in technology must be used for this purpose.
Accessories
4.4 Plug-in and draw-out technology
3VA molded case circuit breakers with IEC certificate
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Communications interface for draw-out unit
The pre-assembled cable set which functions as the communications interface for the draw-
out unit consists of a pre-assembled cable with a mini USB port at one end and three special
position signaling switches at the other. It is also supplied with another cable with mini USB
connector and tab connector.
Attaching the cable set
1. Insert the three position signaling switches of the cable set in the right-hand side wall
according to the color coding of the cables, see diagram below.
It is irrelevant whether the switches are inserted in slots a or b.
①
CONNECT: Position signaling switch with green cables
②
TEST:
Position signaling switch with blue cables
③
DISCON: Position signaling switch with red cables
The remaining slots are normally used to install standard position signaling switches.
2. Remove the seal over the opening for the micro USB port on the right-hand side wall.
3. Insert the USB connector attached to the cable set into the micro USB port in the right-
hand side wall.
4. Store the cable in the space available behind the side wall.
5. Connect the position signaling switches and the COM060 communication module to the
USB connector and tab connector of the second cable.
Accessories
4.4 Plug-in and draw-out technology
3VA molded case circuit breakers with IEC certificate
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The cable with pre-assembled USB and tab connectors can also be ordered as an individual
item for installation on molded case circuit breakers prepared for use as draw-out units.
For detailed instructions on how to install the communications interface for the draw-out unit,
please refer to the relevant Operating Instructions
(http://support.automation.siemens.com/WW/view/en/80597324).
For instructions on how to read out data via remote data transfer, refer to the operating
instructions for the COM100/COM800 breaker data server.
Auxiliary circuit connector
①
Plug-in technology
②
Draw-out technology
Auxiliary circuit connectors are required only if the molded case circuit breaker to be
converted to plug-in or draw-out technology is equipped with internal accessories. Plug-in
units use a different design of auxiliary circuit connector than draw-out units.
The number of auxiliary circuit connectors required depends on the accessories to be
installed in the molded case circuit breaker and ultimately on the number of electrical
connections which need to be brought out of the molded case circuit breaker. Each auxiliary
circuit connector can be used to connect up to four cables. Accordingly, the breaker-end and
socket-end halves of the auxiliary circuit connectors have four screw-type terminals which
are labeled ".1" to ".4".
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A total of nine auxiliary circuit connectors can be installed depending on the size of the
molded case circuit breaker and the size of the plug-in or draw-out socket. The slots for
auxiliary circuit connectors are labeled from right to left in the socket, starting at 1.
①
Socket-end auxiliary circuit connector
②
Breaker-end auxiliary circuit connector
③
Cable cage
Cable cages are used to attach the breaker-end half of the auxiliary circuit connector to the
underside of the molded case circuit breaker. Slot numbers are also printed on the cable
cages. The design of the cable cages for the top and bottom halves of the molded case
circuit breaker is different so that the cages cannot be mixed up or installed in the wrong
position. The fixing tongues of the breaker-end half of the auxiliary circuit connectors latch
into small recesses in the cable cages which are screw-mounted to the rear panel of the
circuit breaker. The auxiliary circuit connectors are securely fixed once the cable cages have
been installed.
Accessories
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①
Fixing tongue (breaker end)
②
Fixing hook (socket end)
③
Latching element (socket end)
The socket-end half of the auxiliary circuit connectors is simply snapped into the socket.
Various cable routing openings and ducts are provided in the socket and the molded case
circuit breaker. For further details, please refer to the operating instructions for the complete
kits for plug-in or draw-out technology.
See also
Cable cage (Page 306)
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4.4 Plug-in and draw-out technology
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Door feedthrough
Door feedthroughs must be installed for applications which require
● direct operation of a molded case circuit breaker even when the panel door is closed,
● the draw-out version of a molded case circuit breaker to be electrically isolated from or
connected to the installation while the panel door is closed,
● prevention of access to live components inside the panel.
Door feedthroughs are mounted over the front of the molded case circuit breaker and
securely attached to the breaker by means of two bolts and a latch.
Accessories
4.4 Plug-in and draw-out technology
3VA molded case circuit breakers with IEC certificate
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Terminal cover for a molded case circuit breaker converted to plug-in or draw-out technology
①
Terminal cover with molded grips, can be screwed to contact unit
②
Terminal cover for covering the termination area
Two screw-mounted terminal covers ① are included in the scope of supply of the complete
kits and the conversion kits for plug-in and draw-out technology. These feature molded grips
to ease withdrawal of the molded case circuit breaker from its socket. Since it requires
significant force to remove a molded case circuit breaker from its socket, the plug-in terminal
covers are bolted to the contact unit.
These terminal covers can be ordered separately as spare parts.
The additionally available terminal covers ② are used for the plug-in technology as well as
the draw-out technology for covering the terminal area.
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4.4 Plug-in and draw-out technology
3VA molded case circuit breakers with IEC certificate
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Cable cage
Cable cages are used to attach the breaker-end half of auxiliary circuit connectors to the
molded case circuit breaker. They are also designed to act as cable ducts for installing wires
from internal accessories to the auxiliary circuit connector. For further information about
cable cages, please refer to chapter Auxiliary circuit connector (Page 301).
Cable cages consist of a top half and a bottom half. These parts are designed such that they
cannot be mounted in the wrong position at the rear of the molded case circuit breaker.
Cable cages are included in the scope of supply of the conversion kits and complete kits for
converting molded case circuit breakers to plug-in or draw-out units and are therefore also
supplied with complete kits. They are available as standard only in the broadened version for
4-pole units. For use on 3-pole units, part of the cable cage need only be cut away (at the
required breaking point).
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4.4.7.2
Overview of technical specifications
Technical specifications of the accessories for internal components of molded case circuit
breakers in plug-in and draw-out technology:
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4.4.7.3
Combination with other accessories
Information about combination with other accessories
● The communications interface for the draw-out unit and the switches for signaling the
position of the molded case circuit breaker in the draw-out unit are mutually compatible.
For further information, please refer to the following chapters:
Position signaling switches (Page 295)
Communications interface for draw-out unit (Page 300)
● The switches for signaling whether or not the molded case circuit breaker is locked have
no influence on other accessories described in chapter Position signaling switches
(Page 295)
Note
No transfer of "locked / not locked" signals
The information "locked / not locked" cannot be transferred via the COM060
communication module.
● A molded case circuit breaker which requires a communications interface to transfer
signals must be equipped with a COM060 communication module.
● When internal accessories are integrated in a molded case circuit breaker, auxiliary circuit
connectors and cable cages for plug-in and draw-out technology must also be installed.
● Door feedthroughs are required only if the molded case circuit breaker needs to be
operated when the cubicle door is closed. The door feedthrough is compatible with
position signaling switches, communications interface and auxiliary circuit connectors
with cable cages.
● The terminal cover for plug-in technology can be installed in combination with any other
internal accessories. It does not have any effect on other accessories.
● A variable depth adapter (see section Door mounted rotary operator (Page 316)) can be
used in conjunction with the door mounted rotary operator in order to compensate the
racking distance and so allow the molded case circuit breaker to be moved out when the
cubicle door is closed.
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4.5 Manual operators
3VA molded case circuit breakers with IEC certificate
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4.5
Manual operators
The manual operators for 3VA molded case circuit breakers are described in this chapter.
Overview of manual operators
The manual operators available for 3VA molded case circuit breaker are listed below:
● Front mounted rotary operator (optionally with door interlock)
● Door mounted rotary operator
– Fixing bracket for long shafts
– Variable depth adapter for draw-out units
– Supplementary handle for door mounted rotary operator
● Side wall mounted rotary operator (optionally with mounting plate)
The following accessories are available for all manual operators:
● Illumination kit
● Cylinder locks for locking, blocking and interlocking
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4.5.1
Opening, closing and resetting the 3VA molded case circuit breaker
Opening and closing
● To close the 3VA molded case circuit breaker:
Turn the manual operator to the ON (I) position.
● To open the 3VA molded case circuit breaker:
Turn the manual operator to the OFF (O) position.
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Resetting the manual operator after the molded case circuit breaker has tripped
When the molded case circuit breaker trips, the manual operator moves automatically from
the ON (I) to the TRIP position.
The molded case circuit breaker remains in the tripped state until the manual operator is
reset:
1. Clear the fault which has caused the molded case circuit breaker to trip.
2. Turn the manual operator counter-clockwise to the limit stop (RESET position, at or just
past OFF (O)).
The manual operator remains in the OFF (O) position.
3. Turn the manual operator to the ON (I) position.
The molded case circuit breaker is closed again.
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4.5.2
Front mounted rotary operator
The front mounted rotary operator is available in two versions:
● With door interlock
● Without door interlock
①
Front mounted rotary operator with door
interlock
⑥
Indication of the breaker status (on, off, trip)
(see below)
②
Front mounted rotary operator without door
interlock
⑦
Handle with mechanism for up to 3 padlocks
③
Device for up to 3 padlocks
⑧
Trip unit button <PUSH TO TRIP>
④
Door contact (door interlock element)
⑨
Defeat function (door interlock element)
⑤
Cylinder lock device
⑩
Door interlock
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Indication of the breaker status on front mounted rotary operator
①
ON: Breaker closed
④
OFF: Breaker open
②
TRIP: Breaker tripped
⑤
RESET: Reset following a trip
③
Mounting position
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Front mounted rotary operator with door interlock
The front mounted rotary operator with door interlock projects through the panel door. This
arrangement ensures that the molded case circuit breaker can be switched on only when the
panel door is closed. The door is locked automatically when the front mounted rotary
operator is turned to position ON (I).
Overriding the door interlock
The door interlock can be overridden by a deliberate action. This means that the door can be
opened with the operator in position ON (I), e.g. so that maintenance can be carried out.
①
Door position switch
②
Door interlock
③
Defeat function
Procedure
1. Press the door interlocking pin with a sharp object.
2. Hold the pin down while the door is opened.
Switch on the circuit breaker with the panel door open
The door contact must be operated manually in order to switch on the molded case circuit
breaker with the panel door open. The handle can then be moved to the ON (I) position.
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Testing the tripping mechanism
The button <PUSH TO TRIP> can be pressed to perform a function test on the tripping
mechanism.
Procedure
1. Turn the front mounted rotary operator to position ON (I) in order to close the molded
case circuit breaker.
2. Press the button <PUSH TO TRIP> with a tool such as a screwdriver.
The front mounted rotary operator moves from position ON (I) to position TRIP. The
molded case circuit breaker is now in the tripped state.
3. Turn the front mounted rotary operator counter-clockwise to the limit stop (RESET
position, at or just past OFF (O)).
The front mounted rotary operator remains in the OFF (O) position and the molded case
circuit breaker can now be closed again.
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4.5.3
Door mounted rotary operator
With the door mounted rotary operator installed, it is possible to operate the molded case
circuit breaker through the panel door without opening the door.
①
Door mounted rotary operator
②
Indication of the breaker status ON, TRIP, mounting position, OFF, RESET
For mounting position, see chapter Front mounted rotary operator (Page 312)
③
Handle with device for up to 3 padlocks
④
Tolerance compensation
⑤
Device for up to 3 padlocks
⑥
Cylinder lock device (type Ronis)
⑦
Trip unit button <PUSH TO TRIP>
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Door interlock with door mounted rotary operator
The door interlock of the door mounted rotary operator locks the door as soon as the door
mounted rotary operator is turned to position ON (I).
Overriding the door interlock
The door interlock can be overridden by a deliberate action. This means that the door can be
opened with the operator in position ON (I), e.g. so that maintenance can be carried out. The
door interlock can also be completely deactivated by a small modification on the inside of the
handle. The panel door can then also be opened at any time without additional measures if
the circuit breaker is switched on (position ON). For details, see the Operating Instructions
(https://support.industry.siemens.com/cs/ww/en/view/80600132).
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Procedure
1. Press the door interlocking pin with a sharp object.
2. Hold the pin down while the door is opened.
See also
(https://support.industry.siemens.com/cs/ww/en/view/80600132)
Tolerance compensator
Door mounted rotary operators are supplied as standard with a tolerance compensator. This
device compensates any potential minor offset between the rotary switch of the cubicle
doors and the shaft of the door mounted rotary operator.
①
Tolerance compensator
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Offset compensator
Testing the tripping mechanism
The button <PUSH TO TRIP> can be pressed to perform a function test on the tripping
mechanism.
Procedure
1. Turn the door mounted rotary operator to the OFF (O) position.
2. Open the panel door.
3. Use a tool to turn the shaft to the ON (I) position in order to close the molded case circuit
breaker.
Alternatively, the supplementary handle for the door mounted rotary operator can also be
used to close the breaker.
4. Press the button <PUSH TO TRIP> with a tool such as a screwdriver.
The door mounted rotary operator moves from position ON (I) to position TRIP. The
molded case circuit breaker is now in the tripped state.
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5. Turn the door mounted rotary operator counter-clockwise to the limit stop (RESET
position, just beyond OFF (O)).
The manual operator remains in the OFF (O) position.
6. Close the panel door.
The molded case circuit breaker can now be closed again.
Supplementary handle for door mounted rotary operator
The supplementary handle can be used to operate the molded case circuit breaker when the
cubicle door is open.
Use the supplementary handle to close the molded case circuit breaker:
A deliberate action is required to turn the molded case circuit breaker to the ON (I) position:
1. Push in the supplementary handle.
2. Turn the supplementary handle to the ON (I) position in order to close the molded case
circuit breaker.
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Variable depth adapter
The variable depth adapter enables adjustment of the travel distance Connect - Test -
Disconnect when using draw-out technology. As a result, the panel door does not have to be
opened in the Connect, Test and Disconnect positions. See also chapter Draw-out
technology (Page 285)
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4.5.4
Side wall mounted rotary operator
The side wall mounted rotary operator allows the molded case circuit breaker to be operated
through the right-hand or left-hand side wall of the cubicle.
①
Side wall mounted rotary operator
②
Handle with device for up to 3 padlocks
③
Side wall of cubicle
④
Device for up to 3 padlocks
⑤
Device for cylinder lock
⑥
Trip unit button <PUSH TO TRIP>
⑦
Switching position indicator ON, TRIP, mounting position, OFF, RESET
For mounting position, see chapter Front mounted rotary operator (Page 312)
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Side wall mounted rotary operator with mounting plate
The side wall mounted rotary operator is available in a version with mounting plate for
molded case circuit breakers up to 250 A. The mounting plate can be installed on the right-
hand or left-hand side panel. The space on the mounting plate can be used to install other
components.
If there is insufficient space available on the mounting plate to install terminals, a terminal
plate ① can be bolted to the cubicle.
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4.5.5
Locking and interlocking for manual operators
The following accessories for locking, blocking and interlocking are used:
● Locking at the handle
● Locking, blocking and interlocking at the rotary operator
4.5.5.1
Locking by the handle
The following manual operators can be locked by the handle:
● Front mounted rotary operator
● Door mounted rotary operator
● Side wall mounted rotary operator
Up to three padlocks with a shackle diameter of between 5 and 8 mm can be used to lock
the rotary operators. Padlocks are not included in the scope of supply.
Front mounted rotary operator
Lockable switching positions:
● Position OFF (O)
● Position ON (I)
Possible only if the front mounted rotary operator has been modified accordingly during
installation.
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Door mounted rotary operator and side wall mounted rotary operator
Lockable switching positions:
● Position OFF (O)
When the door mounted rotary operator or the side wall mounted rotary operator is
locked in the OFF (O) position, the molded case circuit breaker cannot be closed, nor can
the cubicle door be opened. The door interlock cannot be overridden.
● Position ON (I)
Possible only if the door mounted rotary operator or the side wall mounted rotary operator
has been modified accordingly during installation.
Note
No impairment of protection functions
Locking the rotary operators in the ON (I) position does not impair the protective functionality
of the molded case circuit breakers. In the event of a fault, the molded case circuit breaker
trips in the normal way.
When the rotary operator is unlocked, the switching position changes to TRIP.
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4.5.5.2
Locking and interlocking by the rotary operator
The following manual operators can be locked and interlocked by the rotary operator:
● Front mounted rotary operator
● Rotary operator with shaft stub
● Door mounted rotary operator
● Side wall mounted rotary operator
The manual operators can be locked by up to three padlocks with a shackle diameter of
between 5 and 8 mm or by means of cylinder locks (type Ronis). Manual operators can be
interlocked only by means of cylinder locks (type Ronis).
In addition, the door mounted rotary operator and side wall mounted rotary operator at the
masking plate in the panel door or side panel can also be locked using cylinder locks (type
Kaba).
Padlocks and cylinder locks are not included in the scope of supply of manual rotary
operators.
Locking with padlocks
All rotary operators are equipped with a padlock locking unit. This locking unit is simply
pulled out of the rotary operator.
Example of rotary operator with shaft stub:
Lockable switching positions:
● Position OFF (O)
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Locking or interlocking using a cylinder lock (type Ronis)
Rotary operators can be locked or interlocked (depending on how the lock holder is installed)
by means of the cylinder lock (type Ronis).
Example of a front mounted rotary operator and a rotary operator with shaft stub:
Locking with cylinder lock (type Ronis):
The cylinder lock (type Ronis) locks the rotary operators in the OFF (O) position.
Mutual interlocking with cylinder lock (type Ronis):
By using the cylinder lock insert for interlocking, it is possible to establish a mutual interlock
between an unlimited number of rotary operators. This requires that the keys of all molded
case circuit breakers locked in the open position are removed from the lock and stored in a
safe place. Only the key of the rotary operator which is in the ON (I) position is left in the
cylinder lock. This key cannot be removed while the rotary operator is in the ON (I) position.
The key can be removed only after the rotary operator has been turned to the OFF (0)
position, the cylinder lock turned to the "locked" position so that the molded case circuit
breaker is interlocked. See also chapter Cylinder locks for implementing interlocks between
multiple 3VA molded case circuit breakers (Page 369).
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Locking with cylinder lock (Kaba)
The door mounted rotary operator and the side wall mounted rotary operator can be locked
by means of a cylinder lock (type Kaba) fitted in the panel door or side panel.
The cylinder lock (type Kaba) is not included in the scope of supply.
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4.5.6
Degree of protection
When fitted with an escutcheon (see illustration below), a front mounted rotary operator
installed in the cubicle door has degree of protection IP30.
Note
To ensure that the control cabinet door can still be opened, the front mounted rotary operator
must not project over the cover frame by more than 5 mm when the door is closed.
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4.5.7
Accessories
Illumination kit
With this kit installed, the front edge of the handle of the front mounted operator of the door
mounted rotary operator or side wall mounted rotary operator lights up to indicate the
switching position of the circuit breaker. The illumination kit can be ordered with the operator
as a pre-assembled accessory, or individually as a retrofit component.
The illumination kit operates on a 24 V DC supply.
Its power consumption is 0.16 W.
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4.6
Motor operators
4.6.1
MO310 side mounted motor operator
The MO310 side mounted motor operator makes it possible to implement remote control of
the 3VA1 molded case circuit breaker without having to attach anything to the front of the
circuit breaker. Its compact design (cover size of 45 mm) and the DIN rail mounting option
make this MO310 side mounted motor operator especially suitable for:
● Building distribution boards
● Distribution boards
MO310 side mounted motor operators are also used in conjunction with automatic transfer
control devices.
①
MO310 motor operator
⑤
<PUSH TO TRIP> button
②
Plastic cover
⑥
Reset mode setting
③
Seal
⑦
LED "Active"
④
Handle for manual operation
⑧
Mechanism for padlocks
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Description
The switchstick on the front panel clearly shows the switching position of the molded case
circuit breaker. The MO310 side mounted motor operator meets the requirements pertaining
to isolating features stipulated by IEC / EN 60947-1.
Switchstick on the front panel
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4.6.1.1
MANUAL, AUTO and LOCK modes
The MO310 side mounted motor operator is switched to MANUAL or AUTO mode when the
plastic cover is opened (MANUAL) or closed (AUTO).
MANUAL:
When the plastic cover is open, the MO310 side mounted motor operator is in MANUAL
mode. The switchstick on the front panel can be operated to move the molded case circuit
breaker to the ON (I) or OFF (O) position.
AUTO:
If the plastic cover is closed, the MO310 side mounted motor operator is operated via control
cables, e.g. via pushbuttons or a PLC.
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LOCK:
The MO310 side mounted motor operator can be interlocked to prevent reclosing by
operating the locking bar in the OFF (O) position. The locking device can be locked with up
to three padlocks (shackle diameter 5.0 mm to 8.0 mm). Padlocks are not included in the
scope of supply.
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4.6.1.2
Closing, opening and resetting the 3VA molded case circuit breaker
Closing and opening in MANUAL mode
The plastic cover is open. The MO310 side mounted motor operator is in MANUAL mode.
● Close the molded case circuit breaker:
Push the switchstick to the ON (I) position.
The molded case circuit breaker is closed ON (I). The contacts are closed.
● Open the molded case circuit breaker:
Push the switchstick to the OFF (O) position.
The molded case circuit breaker is open OFF (O). The contacts are open.
Closing and opening in AUTO mode
The plastic cover is closed. The MO310 side mounted motor operator is in AUTO mode. The
3VA molded case circuit breaker can only be closed or opened by means of electrical
signals.
● Close the 3VA molded case circuit breaker by means of an electrical ON signal at the
terminal block:
The molded case circuit breaker is ON (I). The contacts are closed. The switchstick is in
the ON (I) position.
● Open the 3VA molded case circuit breaker by means of an electrical OFF signal at the
terminal block:
The molded case circuit breaker is OFF (O). The main contacts are separated. The
switchstick is in the OFF (O) position.
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Resetting the molded case circuit breaker
The method by which the molded case circuit breaker is reset by the MO310 side mounted
motor operator depends on the selected reset mode.
Selectable reset mode
The reset mode can be set. After the molded case circuit breaker has tripped, the selected
reset mode determines the response of the motor operator in the TRIP position.
Response of MO310 side mounted motor operator to tripping of the molded case circuit
breaker, depending on the selected reset mode:
Connection diagram for control of the MO310 motor operator
The MO310 motor operator is edge-controlled, i.e. it reacts only to the positive edge of an
ON or OFF command at the relevant terminals 3 and 4. In this case, the OFF signal is
dominant, i.e. the motor operator will be switched off in response to an OFF edge even if an
ON signal is applied.
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The MO310 requires a pause period of 80 ms between the end of an OFF signal and the
edge of an ON signal. Since the OFF signal is dominant, it does not require a pause period.
4.6.1.3
Faults, causes of faults and rectification of faults
Device defective and internal fault:
● "Device defective" refers to a fault or defect in the motor operator which cannot be
rectified. The device must be replaced. This can be caused by a defective microswitch,
for example.
● "Internal error" refers to faults which can be rectified (e.g. an undefined switching position,
fault during automatic RESET, excessively long switching times). If the motor operator
fault condition cannot be rectified by switching it ON/OFF again, the switching position
must be corrected manually.
Note
You must first ensure that the rotary switch for RESET mode is in a defined state.
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4.6.2
Motor operator MO320
The motor operator MO320 transmits commands via electrical control cables to open and
close the molded case circuit breaker. The source of commands transmitted via electrical
control cables can be a pushbutton or a PLC, for example.
Motor operators must also used in conjunction with automatic transfer control devices.
①
MO320 motor operator
⑦
Handle for manual operation
②
Characteristic data of the molded case
circuit breaker
⑧
Connecting terminals for power supply
(AC/DC depending on version)
③
LED "TRIP"
⑨
Seal
④
Indication of the breaker status ON/OFF
⑩
Reset mode setting
⑤
Mechanism for padlocks
⑪
LED "Active"
⑥
Button for trip unit <PUSH TO TRIP>
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Description of front panel
The front panel of the motor operator MO320 features an indication of the breaker status and
an LED labeled "TRIP". The indication directly reflects the status of the actuating shaft. With
its clear breaker status indication, the motor operator MO320 meets the requirements
pertaining to isolating features stipulated by IEC / EN 60947-1.
Indication of the breaker status on the front panel
LED status displays
See also chapter Faults, causes of faults and rectification of faults (Page 346).
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4.6.2.1
MANUAL, AUTO and LOCK modes
The motor operator MO320 is switched to MANUAL or AUTO mode when the plastic window
is opened (MANUAL) or closed (AUTO).
MANUAL:
When the plastic window is open, the motor operator MO320 is in MANUAL mode. The
motor operator is moved to position ON (I) or OFF (O) by manual operation of the handle.
AUTO:
When the plastic window is closed, the motor operator MO320 is in AUTO mode. The motor
operator can be operated via control cables, e.g. in response to signals issued by a
pushbutton or by control commands output by a PLC.
LOCK:
The motor operator can be locked in the OFF (O) position to prevent reclosure of the
breaker. The padlock locking device snaps out if the slide above it is moved to the "LOCK"
position.
Up to three padlocks with a shackle diameter of between 5 and 8 mm can be inserted
through the openings in the padlock locking unit. Padlocks are not included in the scope of
supply.
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4.6.2.2
Opening, closing and resetting the 3VA molded case circuit breaker
Closing and opening in MANUAL mode
The plastic window is open, the motor operator is in MANUAL mode. The supply to the LEDs
is also disconnected, but the motor operator remains fully operational.
● Close the 3VA molded case circuit breaker:
Turn the handle clockwise until the breaker status indicator displays ON (I).
The molded case circuit breaker is now ON (I). The contacts are closed.
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● Open the 3VA molded case circuit breaker:
Turn the handle clockwise until the breaker status indication indicates OFF (O).
The molded case circuit breaker is now OFF (O). The contacts are open.
Closing and opening in AUTO mode
The plastic window is closed, the motor operator is in AUTO mode. The 3VA molded case
circuit breaker can only be closed or opened by means of electrical signals.
● Close the 3VA molded case circuit breaker by means of an electrical ON signal at the
terminal block:
The molded case circuit breaker is ON (I). The contacts are closed. The switching
position indicator on the front panel of the motor operator displays ON (I).
● Open the 3VA molded case circuit breaker by means of an electrical OFF signal at the
terminal block:
The molded case circuit breaker is OFF (O). The main contacts are separated. The
switching position indicator on the front panel of the motor operator displays OFF (O).
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Resetting the molded case circuit breaker
If the 3VA molded case circuit breaker has tripped, the LED labeled "TRIP" lights up
①
Reset mode setting
The method by which the 3VA molded case circuit breaker is reset by the motor operator
depends on the selected reset mode.
Reset modes
The reset mode can be set. After the molded case circuit breaker has tripped, the selected
reset mode determines the response of the motor operator in the TRIP position.
Motor operator response to tripping of the 3VA molded case circuit breaker depending on the
reset mode selection:
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Connection diagram for control of the motor operator MO320
Note
An EMERGENCY-OFF circuit is implemented by means of undervoltage releases
(Page 191).
For further circuit diagrams, see chapter "Circuit diagrams" (Page 539).
The MO320 motor operator is edge-controlled, i.e. it reacts only to the positive edge of an
ON or OFF command at the relevant terminals 3 and 4. In this case, the OFF signal is
dominant, i.e. the motor operator will be switched off in response to an OFF edge even if an
ON signal is applied.
The MO320 requires a pause period of 80 ms between the end of an OFF signal and the
edge of an ON signal. Since the OFF signal is dominant, it does not require a pause period.
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4.6.2.3
Faults, causes of faults and rectification of faults
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4.6.3
SEO520 motor operator with stored energy operator
The front motor operator with SEO520 stored energy operator is primarily designed for
network synchronization applications on account of its fast switching times. It also offers the
option of a communication link which allows the 3VA2 molded case circuit breaker to be
remotely controlled in fieldbus systems associated with the 3VA range.
①
Connecting terminals
②
Cylinder lock installation option (type Ronis) for mode interlocking
③
OFF button
④
Tool insertion slot for manually winding up the stored energy operator
⑤
Installation option for mechanical operating cycles counter
⑥
ON button
⑦
Slot for storing tool for manual wind-up
⑧
<PUSH TO TRIP> test button
⑨
Locking device for padlocks
⑩
Active and Communication LEDs
⑪
Mode slide switch
⑫
Reset mode selector switch
⑬
Indication of status of stored energy operator
⑭
Indication of the breaker status (ON/OFF)
⑮
Power supply top unit (24 V DC, 42 - 60 V AC/DC, 110 - 230 V AC/DC)
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Description of front panel
The front panel of the motor operator with SEO520 stored energy operator features an
indication of the breaker status and an LED labeled "TRIP". The clear breaker status
indication allows the SEO520 motor operator to meet the requirement pertaining to isolating
features stipulated by IEC / EN 60947-1.
Indication of the breaker status on the front panel
LED status displays
Stored energy operator status display
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4.6.3.1
MANUAL, AUTO and LOCK modes
The SEO520 motor operator with stored energy operator features the operating modes
● MANUAL (manual mode)
● AUTO (remote control mode)
● LOCK (locked)
These are selected using a slide switch on the front of the SEO.
MANUAL
In MANUAL mode (slide switch on the left), the SEO520 motor operator can only be
operated using the buttons on the front panel of the SEO520 motor operator.
AUTO
In AUTO mode (slide switch in the middle), the SEO520 motor operator is operated via
control cables, e.g. via pushbuttons or a PLC, or via the optional communication function.
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LOCK
In LOCK mode (slide switch on the right, only possible in the OFF (O) position), the SEO520
motor operator can be interlocked to prevent reclosing. The locking device can be locked
with up to three padlocks (shackle diameter 5.0 mm to 8.0 mm).
Padlocks are not included in the scope of supply.
4.6.3.2
Closing, opening and resetting the 3VA molded case circuit breaker
Closing and opening
In MANUAL mode
In MANUAL mode, the molded case circuit breaker is operated using the buttons on the front
panel of the SEO520 motor operator. Remote control is not possible.
Operating the ON (I) button causes the contacts of the molded case circuit breaker to close.
Operating the OFF (O) button causes the contacts to open. This is not performed by means
of a TRIP. It is an actual switch-off operation.
In AUTO mode
In AUTO mode, the molded case circuit breaker can be closed and opened by means of
electrical signals at the terminal block.
Versions with the communication module can be closed and opened via the connection to
the COM060 communication module in the molded case circuit breaker. This takes place via
the communication environment selected for the 3VA2 molded case circuit breaker, e.g.
PROFIBUS, PROFINET, Ethernet (Modbus TCP). ON/OFF commands can also be issued
via the powerconfig commissioning and parameterization software. Here too, an actual
switch-off operation is performed and not a TRIP.
In AUTO mode, the OFF (O) button on the SEO520 operator can be used. The ON (I) button
cannot be operated.
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Resetting the molded case circuit breaker
The method by which the molded case circuit breaker is reset by the SEO520 motor operator
depends on the selected reset mode.
Selectable reset mode
The reset mode can be set. After the molded case circuit breaker has tripped, the selected
reset mode determines the response of the motor operator in the TRIP position.
Response of SEO520 motor operator to tripping of the molded case circuit breaker,
depending on the selected reset mode:
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4.6 Motor operators
3VA molded case circuit breakers with IEC certificate
352 Manual, 03/2019, A5E03603177010-03
Connection diagram for control of the SEO520 motor operator
The SEO520 motor operator is edge-controlled, i.e. it reacts only to the positive edge of an
ON or OFF command at the relevant terminals 3 and 4. In this case, the OFF signal is
dominant, i.e. the motor operator will be switched off in response to an OFF edge even if an
ON signal is applied.
The SEO520 requires a pause period of 80 ms between the end of an OFF signal and the
edge of an ON signal. Since the OFF signal is dominant, it does not require a pause period.
Accessories
4.6 Motor operators
3VA molded case circuit breakers with IEC certificate
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4.6.3.3
Faults, causes of faults and rectification of faults
"Device defective" refers to a fault or defect in the motor operator which cannot be rectified.
The device must be replaced. This can be caused by a defective microswitch, for example.
"Internal error" refers to faults which can be rectified (e.g. an undefined switching position,
fault on automatic RESET, excessively long switching times). If the motor operator fault
condition cannot be rectified by (remotely) switching it ON/OFF again, the following actions
are necessary:
● Ensure that the rotary switch for RESET mode is in a defined state (1, 2 or 3)
● Correct the switching position manually (manually charge the stored energy and operate
the ON/OFF button).
Accessories
4.6 Motor operators
3VA molded case circuit breakers with IEC certificate
354 Manual, 03/2019, A5E03603177010-03
4.6.3.4
Communication
A communication-capable version of the SEO520 motor operator can be ordered as an
option. This integrates it in the 3VA communication environment and makes it possible to
remotely control the molded case circuit breaker. The signal transmission takes place via an
SEO-COM adapter to the COM060 communication module in the right-hand accessory
compartment of the molded case circuit breaker.
1. Insert the COM060 communication module and the SEO-COM adapter in the molded
case circuit breaker.
2. Break off the assembly support of the SEO-COM adapter.
3. Fit the SEO520 in the mounting position.
The communication connection is established automatically when the COM060 is
connected to COM800/100, thereby contacting the 24 V DC.
Accessories
4.6 Motor operators
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 355
4.6.3.5
Accessories
Cylinder lock (type Ronis)
The SEO520 motor operator can be fitted with a cylinder lock (type Ronis) at the front. The
lock kit comprises a cylinder lock with four possible key versions and the SEO-specific lock
insert. The cylinder lock interlocks the selected operating mode (MANUAL, AUTO, LOCK) to
prevent any unauthorized change of operating mode.
Operating cycles counter
The mechanical operating cycle counter can be installed at the front. It counts the number of
ON/OFF cycles from the time it is installed.
Accessories
4.6 Motor operators
3VA molded case circuit breakers with IEC certificate
356 Manual, 03/2019, A5E03603177010-03
Compatibility with other accessories
CAUTION
Irreparable damage to the molded case circuit breaker
If the SEO520 motor operator is equipped with a communication option, the use of auxiliary
(AUX) switches is
not
permitted in the HP version (3VA9988-0AA11) due to requirements
pertaining to air and creepage distances in the right-hand accessory compartment of the
molded case circuit breaker.
This warning notice is relevant for cases where an SEO520 motor operator with a
communication option is used in an application without communication. If the SEO520 motor
operator is connected to a communication system, the COM060 communication module
occupies the mounting location of the auxiliary (AUX) switch in the HP version in the right-
hand accessory compartment.
Accessories
4.6 Motor operators
3VA molded case circuit breakers with IEC certificate
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4.6.4
Technical specifications
MO310 motor operator
Accessories
4.6 Motor operators
3VA molded case circuit breakers with IEC certificate
358 Manual, 03/2019, A5E03603177010-03
MO320 motor operator
Accessories
4.7 Locking and interlocking
3VA molded case circuit breakers with IEC certificate
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SEO520 motor operator with stored energy operator
Details of breaking capacity of inputs/outputs
Accessories
4.7 Locking and interlocking
3VA molded case circuit breakers with IEC certificate
360 Manual, 03/2019, A5E03603177010-03
4.7
Locking and interlocking
4.7.1
General information
With all types of 3VA molded case circuit breaker, a basic distinction is made between:
● Locking of molded case circuit breakers
● Interlocking of molded case circuit breakers
4.7.1.1
Locking
Padlock devices can be used to lock 3VA molded case circuit breakers in the OFF (O) or ON
(I) position. A molded case circuit breaker cannot be operated when it is locked.
Locking a molded case circuit breaker in the OFF (O) position
In order to prevent closure of a 3VA molded case circuit breaker, it can be locked in the OFF
(O) position by a padlock. Once it is locked, the 3VA molded case circuit breaker is safely
locked in the OFF (O) position. It can be unlocked again only by an authorized person.
The padlock devices for locking the 3VA molded case circuit breaker in the OFF (O) position
ensure safe separation of the main contacts as defined by IEC 60947-2.
Accessories
4.7 Locking and interlocking
3VA molded case circuit breakers with IEC certificate
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Locking a molded case circuit breaker in the ON (I) position
It is also possible to safely lock a 3VA molded case circuit breaker in the ON (I) position
using a padlock device. The breaker contacts cannot be opened when it is locked in this
position. A 3VA molded case circuit breaker can be released from its ON position again only
by an authorized person.
The TRIP function, i.e. the protective functionality of the 3VA molded case circuit breaker, is
not affected by locking the breaker in the ON (I) position. In the event of a fault, the 3VA
molded case circuit breaker trips in the normal way.
4.7.1.2
Interlocking
The available interlocking devices can be used to implement a mutual interlock between at
least two 3VA molded case circuit breakers.
The interlocking device only ever releases one 3VA molded case circuit breaker at a time,
thereby ensuring that only the released circuit breaker can be operated. All other 3VA
molded case circuit breakers remain in the safe OFF (O) position and are blocked by the
interlock.
Accessories
4.7 Locking and interlocking
3VA molded case circuit breakers with IEC certificate
362 Manual, 03/2019, A5E03603177010-03
Principle of two mutually interlocked 3VA molded case circuit breakers:
①
Molded case circuit breaker blocked/locked in the safe switching state OFF (O)
②
Molded case circuit breaker released for operation
The following interlocking systems are available for 3VA molded case circuit breakers:
● Front interlock
● Rear interlock
Front interlock
All front interlocks are installed on the front panel of the 3VA molded case circuit breaker.
Front interlocks make it impossible to install some other external accessories, e.g. motor
operator, rotary operators. They also partially restrict access to internal accessory
compartments.
Rear interlock
The rear interlock does not affect the front panel of the 3VA molded case circuit breaker. All
components of the interlocking system are concealed behind the molded case circuit breaker
or the mounting plate.
Accessories
4.7 Locking and interlocking
3VA molded case circuit breakers with IEC certificate
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4.7.2
Locking
The following locking devices are available for 3VA molded case circuit breakers:
● Padlock device for the handle
● Cylinder locks for locking the 3VA molded case circuit breaker
4.7.2.1
Padlock device for the handle
The padlock device for the handle is directly attached to the handle of the 3VA molded case
circuit breaker and latched in place.
Note
For installation instructions, please refer to operating instructions "Padlock device for the
handle".
When the padlock device for the handle is installed, the 3VA molded case circuit breaker can
be locked in the OFF (O) position by up to three padlocks (shackle diameter 4.5 to 8.5 mm).
Accessories
4.7 Locking and interlocking
3VA molded case circuit breakers with IEC certificate
364 Manual, 03/2019, A5E03603177010-03
If the application requires the 3VA molded case circuit breaker to be locked in the ON (I)
position as well, the metal pin ① must be removed by pliers from the handle, see illustration
below. This deliberate action is a safety precaution and prevents accidental locking of the
breaker in the ON position.
①
Metal pin
Padlock devices in INSTA distribution boards
Installed padlock devices for the handle of 3VA1 molded case circuit breakers in rated
current versions 100 A, 160 A and 250 A have a cover size of 45 mm. They are therefore
suitable for installation in INSTA distribution boards.
Installation of other accessories
When the padlock device for the handle is fitted, some other accessories cannot be installed,
see chapter Possible combinations of of accessories (Page 186).
Accessories
4.7 Locking and interlocking
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 365
4.7.2.2
Cylinder locks for locking the 3VA molded case circuit breaker
The 3VA molded case circuit breaker can also be locked in the OFF (O) or ON (I) position by
means of a cylinder lock (type Ronis). The 3VA molded case circuit breaker is protected
against further operation once it has been locked.
Cylinder locks (type Ronis) can be fitted to all types of 3VA molded case circuit breaker. The
cylinder lock is installed in an accessory compartment of the 3VA molded case circuit
breaker.
To provide a cylinder lock, the following two components need to be ordered:
● One cylinder lock (type Ronis)
One lock and two keys are always included in the order.
Selection of the lock number is highly flexible, i.e. it can be selected from a choice of
three different lock numbers. If different cylinder lock numbers are required for multiple
locks, they can be selected from the predefined article numbers stated in the catalog.
Accessories
4.7 Locking and interlocking
3VA molded case circuit breakers with IEC certificate
366 Manual, 03/2019, A5E03603177010-03
● One adapter kit
The adapter kit transfers the motion of the lock to the switching mechanism.
The article number includes the adapter kit and two cylinder lock housings. One cylinder
lock housing (locking) is used for locking applications and the other housing (interlocking)
for interlocking applications.
①
Slide for locking in the OFF position
②
Slide for locking in the ON position
③
Cylinder lock housing for locking
④
Cylinder lock housing for interlocking
Accessories
4.7 Locking and interlocking
3VA molded case circuit breakers with IEC certificate
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Locking in the OFF (O) position
The cylinder lock (type Ronis) is installed with the adapter kit and the cylinder lock housing
for locking in the right-hand accessory compartment of the 3VA molded case circuit breaker
so that the breaker can be locked in the OFF (O) position. The slide for locking in the OFF
position is fitted for this purpose.
①
Adapter kit with OFF position slide
④
Cylinder lock housing for locking
②
Actuating lever
⑤
Cylinder lock (type Ronis)
③
Accessory cover
1. Remove the accessory cover ③ from the 3VA molded case circuit breaker.
2. Drill a hole through the accessory cover at the position marked on the rear face and
smooth down the drilled surface with a file.
3. Insert a cylinder lock (type Ronis) ⑤ and the locking version of the cylinder lock housing
④ in the drilled hole and connect it securely to the accessory cover ② via the actuating
lever.
4. Install the adapter kit ① in the right-hand accessory compartment of the 3VA molded
case circuit breaker.
5. Reattach the accessory cover to the 3VA molded case circuit breaker.
Accessories
4.7 Locking and interlocking
3VA molded case circuit breakers with IEC certificate
368 Manual, 03/2019, A5E03603177010-03
To lock the 3VA molded case circuit breaker in the OFF (O) position, the key must be turned
to the vertical "locked" position.
Locking in the ON (I) position
For safety reasons, a deliberate action is required to lock the breaker in the ON (I) position.
The slide for locking in the ON position must be used for this purpose. Further information
can be found in the relevant operating instructions.
Use of cylinder locks (type Ronis) for other applications
Cylinder locks (type Ronis) can also be used in the following applications:
● For locking the racking distance in draw-out units, see chapter Draw-out technology
(Page 285)
● For locking in the manual operators of the 3VA molded case circuit breaker, see chapter
Manual operators (Page 309)
Installation of other accessories
The installation of the cylinder lock in the accessory compartment of the molded case circuit
breaker partly excludes the installation of other accessory components, e.g. front mounted
accessories such as manual and motor operators as well as front interlocks. Likewise the
cylinder lock blocks slots for internal accessories (for overview see chapter Mounting
locations on 3VA molded case circuit breakers (Page 191)).
Accessories
4.7 Locking and interlocking
3VA molded case circuit breakers with IEC certificate
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4.7.3
Front interlocking
Front interlocks are installed on the front panel of the 3VA molded case circuit breaker.
The following interlocking devices are available for 3VA molded case circuit breakers:
● Cylinder locks for implementing interlocks between an unlimited number of molded case
circuit breakers
● Sliding bar with Bowden cable
● Sliding bar
4.7.3.1
Cylinder locks for implementing interlocks between multiple 3VA molded case circuit
breakers
Cylinder locks (type Ronis) can be installed in the accessory compartments not only to lock
molded case circuit breakers, see chapter Cylinder locks for locking the 3VA molded case
circuit breaker (Page 365), but also to implement mutual interlocks between an unlimited
number of 3VA molded case circuit breakers. The purpose of this system is to ensure that
only one single 3VA molded case circuit breaker included in the interlock application can be
in the ON (I) position at any given time.
In order to implement a mutual interlock between multiple 3VA molded case circuit breakers,
the following two components must be ordered for each circuit breaker to be included in the
interlock arrangement:
● One cylinder lock (type Ronis)
One lock and two keys are always included in the order.
Note
It is important to order the same lock number for all circuit breakers to be included in the
interlock arrangement!
Accessories
4.7 Locking and interlocking
3VA molded case circuit breakers with IEC certificate
370 Manual, 03/2019, A5E03603177010-03
● One adapter kit
The adapter kit transfers the motion of the lock to the switching mechanism.
The article number includes the adapter kit and two cylinder lock housings.
①
Slide for locking in the OFF position
②
Slide for locking in the ON position
③
Locking version of cylinder lock housing
④
Interlocking version of cylinder lock housing
If, for example, three 3VA molded case circuit breakers are to be interlocked, three cylinder
locks (type Ronis) with the same lock number and 3 adapter kits suitable for the particular
3VA molded case circuit breaker must be ordered.
Accessories
4.7 Locking and interlocking
3VA molded case circuit breakers with IEC certificate
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Installing the cylinder lock in the accessory compartment
The cylinder lock (type Ronis) is installed together with the adapter kit and the interlocking
version of the cylinder lock housing in the right-hand accessory compartment of the molded
case circuit breaker.
①
Adapter kit
④
Cylinder lock housing for interlocking
②
Actuating lever
⑤
Cylinder lock (type Ronis)
③
Accessory cover
1. Remove the accessory cover ③ from the 3VA molded case circuit breaker.
2. Drill a hole through the accessory cover at the position marked on the rear face and
smooth down the drilled surface with a file.
3. Insert a cylinder lock (type Ronis) ⑤ and the interlocking version of the cylinder lock
housing ④ in the drilled hole and connect it securely to the accessory cover ② via the
actuating lever.
4. Install the adapter kit ① in the right-hand accessory compartment of the 3VA molded
case circuit breaker.
5. Reattach the accessory cover to the 3VA molded case circuit breaker.
A cylinder lock (type Ronis) is installed at each 3VA molded case circuit breaker to be
interlocked.
Accessories
4.7 Locking and interlocking
3VA molded case circuit breakers with IEC certificate
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Interlocking of molded case circuit breakers
WARNING
Use of more than one key poses safety hazard and/or risk of damage to property
Only leave one key in the entire interlock arrangement.
Store all other keys in a safe place or lock them away.
In order to ensure reliable functioning of the interlock, only one must remain in the entire
interlock arrangement. This one key serves as the release instrument for only one molded
case circuit breaker at a time.
1. Move all 3VA molded case circuit breakers in the interlock arrangement to the OFF
position and lock them (turn the cylinder lock to the horizontal "locked" position).
2. Remove all keys.
All 3VA molded case circuit breakers in the interlock arrangement are now safely locked
in the OFF (O) position and cannot be operated.
3. Insert
one single
key in one circuit breaker included in the interlock; store or lock away
all other
keys.
Accessories
4.7 Locking and interlocking
3VA molded case circuit breakers with IEC certificate
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4. Use the single key to turn the cylinder lock of the 3VA molded case circuit breaker to be
released to the "unlocked" position.
Once the key is in the "unlocked" position, it must not be removed.
5. Move the handle of the released 3VA molded case circuit breaker to the ON (I) position.
Releasing a different molded case circuit breaker
1. Move the handle of the currently released molded case circuit breaker to the OFF (O)
position.
2. Turn the cylinder lock to the vertical "locked" position and remove the key.
This 3VA molded case circuit breaker is now safely locked in the OFF (O) position and
cannot be operated.
3. Use the same key to turn the cylinder lock of the 3VA molded case circuit breaker to be
released to the horizontal "unlocked" position.
4. Move the handle of the released 3VA molded case circuit breaker to the ON (I) position.
Interlock combinations
The following interlock combinations can be implemented with cylinder locks:
● All 3VA1 and 3VA2 molded case circuit breakers can be mutually interlocked.
● Interlocks can be implemented between all sizes of breakers.
● Mutual interlocks can be implemented between all 2-pole, 3-pole and 4-pole molded case
circuit breakers.
Accessories
4.7 Locking and interlocking
3VA molded case circuit breakers with IEC certificate
374 Manual, 03/2019, A5E03603177010-03
Installation of other accessories
When the cylinder lock is fitted in the accessory compartment of the circuit breaker, some
other accessories cannot be installed, see chapter Possible combinations of of accessories
(Page 186).
See also
Manual operators (Page 309)
Draw-out technology (Page 285)
4.7.3.2
Sliding bar with Bowden cable: Modules for sliding bar with Bowden cable
A mutual interlock between up to three molded case circuit breakers can be implemented by
means of the front Bowden cable interlock module. This interlock functions according to the
blocking principle: If one of the circuit breakers included in the interlock is unlocked, the
Bowden cables move in such a way as to ensure that the other molded case circuit breakers
are locked in the OFF (O) position.
In order to implement a front Bowden cable interlock, sliding bar modules must be mounted
on the 3VA molded case circuit breakers to be included in the interlock arrangement. These
modules are equipped with a handle blocking device to block or release operation of the
handle.
①
Sliding bar module
②
Slide
Accessories
4.7 Locking and interlocking
3VA molded case circuit breakers with IEC certificate
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A Bowden cable must be installed in addition to the sliding bar modules. This cable prevents
the slides from releasing more than one molded case circuit breaker at any one time. As a
result, only one 3VA molded case circuit breaker at a time can be operated and only
one
molded case circuit breaker can be in the ON (I) position.
①
3VA1 160 molded case circuit breaker, blocked by slide
②
3VA2 250 molded case circuit breaker, released by slide
Note
For installation instructions, please refer to operating instructions "Sliding bar modules".
Bowden cable lengths
The following lengths of Bowden cable can be ordered:
● 0.5 m
● 1.0 m
● 1.5 m
Accessories
4.7 Locking and interlocking
3VA molded case circuit breakers with IEC certificate
376 Manual, 03/2019, A5E03603177010-03
Interlock combinations
Interlocks can be implemented between the following 3VA molded case circuit breakers:
Possible combinations of handle positions
When a cable interlock module using a Bowden cable is installed to interlock
two
3VA molded case circuit breakers, the following combinations of handle position are
possible:
When a cable interlock module using a Bowden cable is installed to interlock
three
3VA molded case circuit breakers, the following combinations of handle position are
possible:
Accessories
4.7 Locking and interlocking
3VA molded case circuit breakers with IEC certificate
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Installation of other accessories
When the front Bowden cable interlock module is fitted, some other accessories cannot be
installed, see chapter Possible combinations of of accessories (Page 186).
4.7.3.3
Sliding bar
The sliding bar can be used to implement an interlock between three 3VA molded case
circuit breakers of the same size. Up to three padlocks (shackle diameter of between 4.5 and
8 mm) can be attached in order to lock the bar in position.
Installing the sliding bar
①
Side plate
②
Locking slide
1. Attach two side plates ① to the sides of the 3VA molded case circuit breakers.
2. Attach the locking slide ② securely to the two side plates.
Locking the handle
The handle of the 3VA molded case circuit breaker to be locked is blocked when the locking
slide is moved into position.
Up to three commercially available padlocks (shackle diameter 4.5 to 8 mm) can be fitted to
lock the slide in position and prevent operation of the blocked handle. The blocked 3VA
molded case circuit breaker is thus always locked in the safe OFF (O) position, while the
released circuit breaker can still be operated.
If the locking slide is in the midway position and locked there by padlocks, both or all three of
the molded case circuit breakers can be blocked or held securely in the OFF (O) position.
Accessories
4.7 Locking and interlocking
3VA molded case circuit breakers with IEC certificate
378 Manual, 03/2019, A5E03603177010-03
Example of an interlock between two 3VA molded case circuit breakers:
Scope of supply
One article number always includes:
● 2 side plates
● 1 locking slide
Interlock combinations
The following interlock combinations can be implemented with the sliding bar:
● Interlocks can be implemented between the same rated current versions of molded case
circuit breakers:
– 3VA11 with 3VA11
– 3VA12 with 3VA12
– 3VA13 / 3VA14 / 3VA23 / 3VA24 with 3VA13 / 3VA14 / 3VA23 / 3VA24
– 3VA20 / 3VA21 / 3VA22 with 3VA20 / 3VA21 / 3VA22
– Not available for 3VA25
● All 2-pole (see note below), 3-pole and 4-pole molded case circuit breakers of the same
size can be interlocked.
Note
The 2-pole molded case circuit breaker must always be mounted on the right-
hand side in
the sliding bar module.
Accessories
4.7 Locking and interlocking
3VA molded case circuit breakers with IEC certificate
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Possible combinations of handle positions
When a sliding bar interlock between
two
3VA molded case circuit breakers is locked by
padlocks, the following combinations of sliding bar position are possible:
When a sliding bar interlock between
three
3VA molded case circuit breakers is locked by
padlocks, the following combinations of handle position are possible:
Installation of other accessories
When the front handle blocking device is fitted, some other accessories cannot be installed,
see chapter Possible combinations of of accessories (Page 186).
4.7.4
Rear interlock
Rear interlock
The rear interlock system is capable of creating an interlock between two 3VA molded case
circuit breakers and does not restrict the number of accessories which can be assembled on
the front panel of the molded case circuit breaker.
The rear interlock operates according to the following principle: When one molded case
circuit breaker is closed, the other circuit breaker is prevented from closing by a tappet which
engages in the breaker mechanism directly from the rear panel of the molded case circuit
breaker.
The rear interlock is provided by two interlocking modules which are attached at the rear of
the molded case circuit breakers and behind the mounting plate. The two interlocking
modules are interconnected by means of the interlocking rod.
Accessories
4.7 Locking and interlocking
3VA molded case circuit breakers with IEC certificate
380 Manual, 03/2019, A5E03603177010-03
Machining work to the panel mounting plate is required.
①
Molded case circuit breaker 1
④
Interlocking modules
②
Molded case circuit breaker 2
⑤
Panel mounting plate
③
Mounting accessories
⑥
Interlocking rod
Note
The mounting frame for the rear interlocking rod can only be used with fixed-mounted
molded case circuit breakers.
For installation instructions, please refer to the operating instructions for the rear interlock.
Scope of supply
One article number always includes:
● Two interlocking modules
● Mounting accessories
● Interlocking rod
Accessories
4.7 Locking and interlocking
3VA molded case circuit breakers with IEC certificate
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Interlock combinations
The following interlock combinations are possible:
● All molded case circuit breakers 3VA11 / 3VA12 / 3VA13 / 3VA14 and 3VA20 / 3VA21 /
3VA22 / 3VA23 / 3VA24 can be independently interlocked.
● Mutual interlocks can be implemented between all 2-pole, 3-pole and 4-pole molded case
circuit breakers.
Handle positions
When a rear interlock is installed between two 3VA molded case circuit breakers, the
following combinations of handle position are possible:
Accessories
4.7 Locking and interlocking
3VA molded case circuit breakers with IEC certificate
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Aid to facilitate installation of rear interlock
An installation aid is available for all 3VA molded case circuit breakers. It facilitates
installation of the rear interlock and reduces the amount of work required to the panel
mounting plate.
①
Mounting plates (specific to molded case circuit breaker)
②
DIN rail
Accessories
4.7 Locking and interlocking
3VA molded case circuit breakers with IEC certificate
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1. Assemble installation frame:
– Place mounting plates ① on the molded case circuit breaker.
– Install rear interlock.
– Bolt the DIN rails ② to the adapter plates.
2. Bolt the assembled installation frame to the panel mounting plate.
No further work to the panel mounting plate is required.
The same rear interlock combinations can be implemented regardless of whether or not the
installation aid is used.
Note
For installation instructions, please refer to the operating instructions for the rear interlock.
Accessories
4.7 Locking and interlocking
3VA molded case circuit breakers with IEC certificate
384 Manual, 03/2019, A5E03603177010-03
Rear interlock for plug-in and draw-out units
In order to use a rear interlock for plug-in or draw-out versions of the molded case circuit
breakers, the tappet needs to be lengthened. The tappet extension transfers the interlocking
motion of the modules through the plug-in socket or the draw-out socket.
①
Interlocking module
③
Plug-in or draw-out socket
②
Tappet extension
④
Molded case circuit breaker
The rear interlock for plug-in or draw-out units is available as a complete kit containing all the
required components:
● Two interlocking modules
● Mounting accessories
● Interlocking rod
● All the required tappet extensions
An installation aid must be ordered separately if it is required.
Accessories
4.7 Locking and interlocking
3VA molded case circuit breakers with IEC certificate
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Interlock combinations
The same rear interlock combinations can be implemented for plug-in and draw-out versions
as for fixed-mounted versions.
Note
Plug-in and draw-out technology cannot be used in conjunction with mounting plates and
profile rails.
Accessories
4.8 Residual current devices
3VA molded case circuit breakers with IEC certificate
386 Manual, 03/2019, A5E03603177010-03
4.8
Residual current devices
Residual current devices afford fault protection (formerly referred to as: protection in case of
indirect contact) and supplementary protection (formerly referred to as: protection in case of
direct contact) in low-voltage systems. In the event of a basic insulation failure or direct
contact with live components, they provide some degree of protection to persons, material
assets and livestock against harm.
Operating principle of a residual current device
In fault-free electrical installation, the vector sum of the load currents of all connected
conductors equals zero. A residual current occurring in the protected circuit as the result of
an insulation fault, for example, induces a voltage in the secondary winding of a summation
current transformer. The evaluation electronics system monitors the induced voltage and
transmits a trip command to the RCD trip unit if the trip criterion is fulfilled. The molded case
circuit breaker with residual current protection combination is designed to ensure that the
molded case circuit breaker contacts open if the residual current exceeds a preset value.
4.8.1
Portfolio
The new portfolio of residual current devices includes different RCD designs so that an
optimum solution is available for every conceivable type of application. The types can be
distinguished as follows:
● Designs:
– Side mounted
– Loadside
– Modular
Because a wide variety of residual current waveforms (e.g. sinusoidal AC residual currents
or smooth DC residual currents) can occur in different applications (depending on the
electronic switch in the circuit), the following types of residual current devices are available:
● Type A
● Type B
● Type B+
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Since all residual current devices can be set to between 0.03 A and maximum 5 A or 30 A,
they are suitable for use in the following applications:
● Personnel protection: IΔn = 30 mA with instantaneous tripping
Note
In order to protect personnel, it is necessary to seal the transparent protective cover so
that the 30 mA setting range cannot be changed.
● Fire protection: IΔn ≤ 300 mA
● Protection in the case of indirect contact
● Ground-fault protection
While residual current devices attached to the circuit breakers are supplied with voltage from
all connected phases of the system to be monitored, the modular residual current device
(MRCD) is supplied from a 1-phase auxiliary voltage source (internal or external). The
modular residual current device utilizes an undervoltage release (UVR) or a shunt trip.
The recommended applications for different RCD designs are thus as follows:
+ Suitable
− Less suitable
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Sizes
Special "BASIC" residual current devices have been developed for use with 3VA1 molded
case circuit breakers.
Basic RCD310 and Basic RCD510
Side-mounted residual current devices are available for 3VA1 molded case circuit breakers
and 3VA1 switch disconnectors with box terminals up to 250 A. These residual current
devices are optimally designed for installation in distribution boards.
Features
The key features of the RCD310 and RCD510 series are:
● Type A
● Response current IΔn adjustable in eight steps from 0.03 A to 5 A
● Compact, L-shaped design
● Cover size 45 mm
● 3 and 4-pole versions
● LEDs to signal "ready" state and pre-alarms
● Tripped signal at device and via electrical contacts
● Signal must be acknowledged via the RESET button on the residual current device
● Through-hole technology allows connection of cables to circuit breaker's box terminals
● Electromagnetic release (RCR) with dual functionality
● Suitable for mounting on DIN rail
● Suitable for use as a display unit only
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Special characteristics
There are two different functional types of side mounted residual current device, i.e. the
RCD310 and the RCD510. The differences in functionality between these two types are
explained by the list of features below.
● Time delay:
– RCD310 without time delay (instantaneous)
– RCD510 with an adjustable delay time Δt from 0 to 3000 ms
● Number of poles:
– RCD310 is available only in a 4-pole version
– RCD510 is available in 3-pole and 4-pole versions
● Rated operating current:
– RCD310 available only up to 160 A (3VA11)
– RCD510 available up to 250 A
● Supplied connection technology:
– RCD510 (3VA12 molded case circuit breaker) is supplied with the necessary
connection components (1 set of box terminals).
Advantages
● Slimline, side mounted design (30 mm) leaves space for other components in the
distribution board.
● The residual current devices, the 3VA1 molded case circuit breakers and the 3VA1 switch
disconnectors all have a cover size of 45 mm, so that they are easy to install, for
example, adjacent to miniature circuit breakers in a distribution board.
● With the DIN rail adapter accessory installed, RCD310 and RCD510 units up to 160 A
can be mounted easily on a DIN rail.
The side mounted residual current devices also feature a screw mounting option so that
they can be attached directly to a mounting plate.
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Basic RCD320 and Basic RCD520
Features
The key features of the RCD320 and RCD520 series are:
● Type A
● Response current IΔn adjustable in eight steps from 0.03 A to 5 A
● Compact design
● Cover size 45 mm
● 3 and 4-pole versions
● LEDs to signal "ready" state and pre-alarms
● Tripped signal at device and via electrical contacts
● Signal must be acknowledged via the RESET button on the residual current device
● Suitable for use in 1-phase and 3-phase systems
Special characteristics
The differences between the two RCD320 and RCD520 residual current devices designed
for loadside mounting are explained below:
● Time delay:
– RCD320 without time delay (instantaneous)
– RCD520 with an adjustable delay time Δt from 0 to 3000 ms
● Number of poles:
– RCD320 is available only in a 4-pole version
– RCD520 is available in 3-pole and 4-pole versions
● Rated operating current:
– RCD320 available only up to 160 A (3VA11)
– RCD520 available up to 250 A
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Basic RCD520B
Residual current devices types B and B+ for loadside mounting are supplied for
3VA11 molded case circuit breakers up to 160 A.
Type B is also described as universal current sensitive. Unlike residual current devices
RCD320 or RCD520, devices of the type RCD520B detect smooth DC residual currents in
addition to pure sinusoidal AC residual currents and pulsating DC residual currents.
Features
The key features of the RCD520B series are:
● Types B and B+ (selectable)
● Type B+ meets the requirements for advanced preventative protection against fire
according to VDE 0664-400
● Use as residual current device or residual current display unit (selectable)
● Response current IΔn adjustable in
Type B: 8 steps from 0.03 A to 5 A
Type B+: 4 steps from 0.03 A to 0.3 A
● Delay time Δt adjustable in 10 steps from 0 to 10000 ms
● Compact design
● Cover size 45 mm
● 3 and 4-pole versions
● LEDs to signal "ready" state, pre-alarm and MONITORING mode
● Integrated auxiliary contacts for tripped signals and pre-alarms
● Signal must be acknowledged via the RESET button on the residual current device
● Tripping by means of plunger
● Periodic self-test functions
Special characteristics
● Selection between type B/type B+:
– Selection of tripping characteristic (B or B+) possible
● Selection between RCD mode and MONITORING mode:
– RCD520B functions as a protection device in "RCD mode"
– RCD520B functions purely as a display unit in "MONITORING mode"
● Number of poles:
– The 3-pole version of RCD520B is installed in a 4-pole enclosure
● Rated current:
– RCD520B available for 3VA11 (160 A) molded case circuit breaker
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A special "ADVANCED" residual current device has been developed for use with 3VA2
molded case circuit breakers.
Advanced RCD820
The RCD820 series is suitable for use in applications with exacting technical requirements:
● High residual current response values
● Long delay time settings for selective grading
● Onboard interface to a fieldbus communication system
● Graded alarm system
Features
The key features of the RCD820 series are:
● Residual current devices available with ratings up to 630 A
● Type A
● Response current IΔn adjustable in ten steps from 0.03 A to 30 A
● Delay time Δt adjustable in ten steps from 0 to 10000 ms
● 3 and 4-pole versions
● LEDs to signal "ready" state, pre-alarms and communication status
● Auxiliary contacts for tripped signals and pre-alarms
● With remote acknowledgement and remote commissioning capability
● Remote tripping possible via communication link or auxiliary contact
● Suitable for use in 1-phase and 3-phase systems
● Suitable for use as a display unit only
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Modular residual current device
The modular residual current device (MRCD) is ideal for applications which require a high
degree of flexibility. It can be retrofitted easily in an existing installation, for example, in order
to provide residual current protection without the need for any major modifications to the
existing application.
Thanks to its modular design, it is compatible with all breaker designs and can therefore be
combined with 3VA1 molded case circuit breakers and with circuit breakers from the 3VA2
range.
Note
For possible combinations, please refer to Chapter Modular residual current device
(Page 478). Further tested combinations available on request.
The key features of the MRCD are:
● Digital modular residual current device type A (compliant with IEC 60947-2 Annex M)
● Response current IΔn adjustable in seven steps from 0.03 A to 3 A
● Delay time Δt adjustable in twelve steps from 0 to 10 s
● Compact design
● Cover size 45 mm
● Suitable for 2-pole, 3-pole or 4-pole circuit breakers
● Summation current transformer with a diameter ranging from 35 mm to 210 mm
● Operated by means of 6 buttons
● Output of status and current measured value on color display screen
● Fault cause is displayed in the event of faults
● Two relay contacts, one for alarm (warning of continuous rise in residual current) and one
for trip, which can be programmed independently of one another
● Voltage of monitored circuit up to max. 690 V AC
● For installation on 35 mm DIN rail
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4.8.1.1
Possible combinations of residual current devices and 3VA circuit breakers
3p
3-pole
4p 4-pole
F Fixed-mounted circuit breaker
PI
Plug-in circuit breaker
DO Draw-out circuit breaker
1) Cannot be combined with switch disconnector
2)
3-pole version in 4-pole enclosure
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4.8.2
Residual current devices for mounting on circuit breakers
The RCD310, RCD510, RCD320, RCD520, RCD520B and RCD820 residual current devices
are available as accessories for mounting on specific 3VA molded case circuit breakers up to
the largest circuit breaker size/current rating.
Combination with circuit breakers
After a residual current device has been mounted on a molded case circuit breaker or switch
disconnector, the specifications of the breaker or disconnector remain unchanged with
respect to the following characteristics:
● Standards
● Conductor cross-sections
● Use of connection accessories
● Isolating features
● Selective behavior
When a basic type residual current device is mounted on a 3VA1 molded case circuit
breaker or a 3VA1 switch disconnector, the electrical rating of the equipment combination is
automatically downgraded to the lower electrical rating of the residual current device.
Example:
Ue: 3VA1 ≤ 690 V AC
3VA1 and Basic residual current device ≤ 480 V AC
For more information, refer to chapter Technical specifications (Page 472).
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Residual current devices
Standards
The combination of molded case circuit breaker and residual current device conforms to
IEC 60947-2 Annex B.
Power supply
The residual current devices do not require an external power supply, but tap a supply from
the main current paths of the molded case circuit breaker or switch disconnector.
Guaranteed to function properly
Proper functioning of the residual current device is guaranteed even with only one phase and
N (applies to RCD320, RCD520, RCD520B and RCD820) or two phases (alternating current
or pulsating direct voltage).
Direction of incoming supply
The direction of incoming supply to the combination of circuit breaker and residual current
device is optional, i.e. it can be connected at the top or bottom. The performance of the
residual current devices is not impaired by regenerative feedback from motors.
Device type
Residual current devices without an additional letter at the end of the short code (e.g.
RCD520) meet the requirements for device type A, i.e. they are capable of detecting all
sinusoidal AC residual currents and pulsating DC residual currents.
The letter B at the end of the short code (e.g. RCD520B) indicates that it is a universal
current-sensitive residual current device (type B or B+).
Combination with external accessories
DIN rail adapters
DIN rail adapters are available as accessories for side-mounted residual current devices
RCD310 and RCD510 up to 160 A. These permit fast and easy installation of residual
current devices on 35 mm DIN rails compliant with IEC / EN 60715 TH35-7.5 and TH35-15.
You can find more information in chapter DIN rail adapter (Page 531).
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4.8.2.1
Side mounted residual current devices Basic RCD310 and Basic RCD510
Front view of Basic RCD310 and Basic RCD510
RCD310
①
Type designation
⑪
Standard
②
Electromagnetic release (RCR = Residual
Current Release)
⑫
Article number
③
Maximum rated operational current, rated
operational voltage and frequency
⑬
Rated insulation voltage and rated impulse
strength
④
Device type
⑭
Transparent protective cover over setting
buttons
⑤
Location and date of manufacture
⑮
Setting button for response current
⑥
Only suitable for use in 3-phase systems
⑯
LED: ACTIVE and pre-alarm
⑦
Knowledge Manager
⑰
RESET button / tripped display
⑧
Contact hazard protective cover over main
current paths with sealing option
⑱
Test button (test device)
⑨
Circuit breaker
⑲
Auxiliary contacts
⑩
Product version
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RCD510
①
Type designation
⑪
Standard
②
Electromagnetic release (RCR = Residual
Current Release)
⑫
Article number
③
Maximum rated operational current, rated
operational voltage and frequency
⑬
Rated insulation voltage and rated impulse
strength
④
Device type
⑭
Transparent protective cover over setting
buttons
⑤
Location and date of manufacture
⑮
Setting button for delay time
⑥
Only suitable for use in 3-phase systems
⑯
Setting button for response current
⑦
Knowledge Manager
⑰
LED: ACTIVE and pre-alarm
⑧
Contact hazard protective cover over main
current paths with sealing option
⑱
RESET button / tripped display
⑨
Circuit breaker
⑲
Test button (test device)
⑩
Product version
⑳
Auxiliary contacts
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Description of front panel view
Display elements
"Ready" signals and alarms
● "Ready" signal of the residual current device:
The LED labeled "ACT" stands for ACTIVE and lights up when the residual current device
is ready.
● Pre-alarm:
Both the Basic RCD310 and the Basic RCD510 feature an alarm LED labeled "AL" (pre-
alarm) which lights up promptly to indicate potential shutdown of the installation due to
residual current.
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LED displays
Tripped display
The <RESET> button is not only used to reset the residual current device, but also as a
mechanical indication that the unit has "tripped". If a residual current is detected or the
button <TEST> is pressed, the button <RESET> is automatically released and so signals
that the residual current device has tripped. Even when the residual current device is at zero
potential, the <RESET> remains in the "TRIP" position.
①
Residual current device is operating nor-
mally and has not tripped
②
Residual current device has tripped
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Operator controls
Insulation tests
It is absolutely essential to isolate the evaluation electronics circuit while insulation tests are
in progress in order to protect the circuit against potential damage on the one hand and to
prevent detection of insulation faults due to the power pack on the other. This is done simply
by withdrawing (15 to 17 mm) the circuit breaker which is anchored in the enclosure.
Disconnection of the main conductor connections is thus unnecessary. On completion of the
tests, the circuit breaker must be pushed back into position before the residual current
device is commissioned.
Testing and resetting the residual current device
Testing
Depending on operating conditions, the test button on the front panel of the residual current
device should be pressed in order to function-test the device. The test button is labeled with
the letter "T". If the test button is pressed, the device is tested immediately irrespective of the
current delay time setting.
If the test button is pressed, a residual current is simulated on a test winding attached to the
summation current transformer. If the residual current device is functioning properly, it must
trip the molded case circuit breaker/switch disconnector.
The test button must be held down for at least two seconds. The design of the test button
prevents unintentional actuation.
Note
The residual current device can be successfully tested only if it is connected to a voltage
equal to at least 85% of the minimum rated operational voltage.
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Resetting
If the residual current device trips the molded case circuit breaker/switch disconnector due to
a high residual current or actuation of the test button, the <RESET> button on the RCD is
released. At the same time, the trip alarm switch which is mechanically coupled with the
<RESET> button also signals that a trip has occurred.
The <RESET> button is labeled with the letter "R".
The following actions must be taken in order to reset the residual current device and reclose
the main contacts of the molded case circuit breaker:
1. Press the <RESET> button on the residual current device.
The "tripped" signal at the signaling contacts is canceled, the residual current device is
now reset.
2. Reset and switch on the molded case circuit breaker or switch disconnector.
Note
If the main contacts of the molded case circuit breaker/switch disconnector are closed before
the residual current device has been reset, the molded case circuit breaker/switch
disconnector will be tripped again immediately (approx. 0.8 s) by the residual current device.
This also applies if the fault which leads to the trip has already been rectified.
Parameterization of the residual current device
①
Setting button for response current IΔn
②
Setting button for delay time Δt (RCD510 only)
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Button for setting the response current IΔn
The response current can be set in eight steps, ranging from 0.03 A to maximum 5 A. Each
response current has a dedicated setting range. The corresponding response current is set
as soon as the button is latched in the setting range.
If the white setting arrow is resting between two setting ranges, the residual current device is
automatically set to 0.03 A for safety reasons.
If the response current is set to 0.03 A, the delay time setting Δt is deactivated and the
breaker is tripped instantaneously. in order to afford personal protection in the case of direct
contact.
Note
In order to protect personnel, it is necessary to seal the transparent protective cover so that
the 30 mA setting range cannot be changed.
The factory setting for the response current is 0.03 A.
Button for setting the delay time Δt (RCD510 only)
The delay time on RCD510 units can be set in eight steps, ranging from 0 (instantaneous) to
a maximum value of 3000 ms.
Each delay time has a dedicated setting range. The corresponding delay time is set as soon
as the button is latched in the setting range.
If the white setting arrow is resting between two setting ranges, the residual current device
trips instantaneously in response to residual currents.
The factory setting for the delay time is 0 ms.
The delay time is not adjustable on the RCD310. The RCD310 always trips instantaneously.
Possible procedure for setting the response current and the delay time
1. Switch off the molded case circuit breaker/switch disconnector.
2. Open the transparent protective cover over the setting buttons.
3. Adjust the setting values for response current and delay time on the residual current
device to the maximum value in each case.
4. Switch on the molded case circuit breaker/switch disconnector.
The LED labeled "ACT" on the residual current device now lights up, the residual current
device is ready.
5. Reduce the setting for the response current until the LED labeled "AL" lights up.
The residual current is now 30% higher than the response current setting.
6. By turning the setting button clockwise, set the next higher response current.
The LED "AL" goes out, the correct response current is now set.
7. Set the required delay time.
8. Close the transparent protective cover over the setting buttons.
The device is now fully parameterized.
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Sealable protective covers of the residual current device
①
Contact hazard protective cover over auxiliary contacts
②
Transparent protective cover over setting buttons
③
Contact hazard protective cover over main current paths
Transparent protective cover over setting buttons
In order to prevent unauthorized access to the setting buttons for IΔn and Δt, the transparent
cover over the settings buttons can be optionally sealed.
Note
In order to protect personnel, it is necessary to seal the transparent protective cover so that
the 30 mA setting range cannot be changed.
Contact hazard protective cover over main current paths including sealing option
After the residual current device RCD310 or RCD510 has been mounted on the 3VA1
molded case circuit breaker or 3VA1 switch disconnector, a contact hazard protective cover
is installed over the main current paths to protect against direct contact. This cover can be
sealed optionally in order to block any attempt to dismantle the residual current device from
the molded case circuit breaker/switch disconnector.
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Terminals
Note
Cables for the following terminals must be routed separately from the main circuits. Their
maximum cable length is 300 m.
A number of auxiliary contacts which perform different functions are located underneath a
contact hazard protective cover:
Alarm switches
TRIP-IND (TRIP INDICATOR)
A tripped signal can be output via the floating contact for display via a warning lamp, for
example. This trip alarm switch operates as soon as the residual current exceeds the
response current setting value and has therefore caused the residual current device to trip.
The standard trip alarm switch has changeover contacts and screw-type connections.
The terminal designations of the relevant contact are shown in the diagram below.
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External control of the residual current release (RCR)
MCCB-TRIP
Although the RCR is utilized by the residual current device, it can also be accessed
externally via a floating contact by means of the auxiliary contact MCCB-TRIP. The floating
contact must be capable of switching a 5 mA current with a voltage supply of 24 V DC.
The RCR functions as a shunt trip, allowing the circuit breaker to be tripped by remote
control. External tripping of the molded case circuit breaker or switch disconnector via the
RCR does not affect the residual current device. In other words, neither the "tripped" display
on the residual current device nor the auxiliary contacts for the "tripped" signal are activated
in the event of an external trip.
It is not possible, however, to connect the contacts named above of several residual current
devices in parallel.
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Status indicators
The table below illustrates the behavior of pre-alarm and tripped signals on RCD310 and
RCD510 devices in response to various user actions and residual currents.
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Terminal labeling and cable installation
Labeling of terminals
The labels for individual terminals are printed on the rear of the contact hazard protection
cover for auxiliary contacts.
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Cable installation
Cable ducts for bringing out cables are provided to the left and right on the residual current
device.
①
Cable duct
Other labels on front panel
Approvals
The residual current device bears the CE mark. For an overview of all approvals, please
refer to Appendix (Page 647).
For all queries relating to approvals, please contact Technical Support (Page 10).
Technical specifications
In ≤ …A: Specifies the highest permissible rated operational current of the molded case
circuit breaker/switch disconnector with which the residual current device may
be combined.
Ue ∼ …V: Specifies the operating voltage range of the residual current device.
…Hz: Specifies the operating frequency range of the residual current device.
Denotes the response behavior to residual currents.
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Installation
The side mounted residual current device is attached to the left-hand side of the molded
case circuit breaker or switch disconnector. No tools are required:
1. Push the molded case circuit breaker/switch disconnector onto the residual current device
along the guides at the top.
2. Push the molded case circuit breaker/switch disconnector backwards until its rear panel is
flush with the rear panel of the residual current device.
3. Place the contact hazard protective cover over the circuit breaker/RCD assembly.
4. Attach the assembly to a mounting plate using the mounting screws or mount it on a DIN
rail adapter.
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The side mounted residual current devices feature through-hole technology.
①
Box terminals of the molded case circuit breaker
②
Phase barriers
③
Summation current transformer
With this technology, the cables are simply guided through the summation current
transformer ③ and connected directly to the box terminals ① of the molded case circuit
breaker or switch disconnector.
The phase barriers ② not only ensure safe operation, but also serve as a guide for correct
routing of cables.
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Tripping
In the event of a fault, the side mounted residual current device employs a residual current
release (RCR) to trip the molded case circuit breaker or switch disconnector. This release is
installed in the accessory compartment to the left of the handle.
The RCR and the connecting cable are included in the scope of supply of the side mounted
residual current device.
The release is connected to the "RCR" contacts on the residual current device via a plug-in
connection and receives a trip command if the residual current reaches or exceeds the
preset value.
①
Plug-in connection for RCR
②
RCR
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Use of the residual current device as a pure display unit
The RCD310 and RCD510 residual current devices can also operate as pure display units
without a tripping function, i.e. they detect and signal residual currents, but do not trip the
molded case circuit breaker or switch disconnector and therefore do not interrupt the circuit.
To operate the RCD310 or RCD510 purely as a display unit, the residual current release
(RCR) and its connecting cable are not installed. The residual current device can perform all
its normal functions, e.g. status signaling, in "display mode."
Note
Because the RCR and its connecting cable have not been installed, the LED "ACT" flashes
continuously.
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Function overview
The table below provides an overview of all the functions and data which are available in the
residual current device environment:
Value can be read
Value can be edited
Commands
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4.8.2.2
Loadside residual current devices Basic RCD320 and Basic RCD520
Loadside residual current devices are also available to order for 3VA1 molded case circuit
breakers.
Front view of Basic RCD320 and Basic RCD520
RCD320
①
②
③
④
⑤
⑥
⑦
⑧
⑨
⑩
Circuit breaker
Type designation
Standard
Approvals
LED: ACTIVE and pre-alarm
Knowledge Manager
Rated insulation voltage and rated impulse
strength
Location and date of manufacture
Device type
Product version
⑪
Article number
⑫
Maximum rated operational current, rated
operational voltage and frequency
⑬
Setting button for response current
⑭
Transparent protective cover over setting
buttons
⑮
Test button (test device)
⑯
RESET button / tripped display
⑰
Auxiliary contacts
⑱
Contact hazard protective cover over main
current paths with sealing option
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RCD520
①
②
③
④
⑤
⑥
⑦
⑧
⑨
⑩
Circuit breaker
Type designation
Standard
Approval
LED: ACTIVE and pre-alarm
Knowledge Manager
Rated insulation voltage and rated impulse
strength
Location and date of manufacture
Device type
Product version
⑪
Article number
⑫
Maximum rated operational current, rated
operational voltage and frequency
⑬
Setting button for delay time
⑭
Setting button for response current
⑮
Transparent protective cover over setting
buttons
⑯
Test button (test device)
⑰
RESET button / tripped display
⑱
Auxiliary contacts
⑲
Contact hazard protective cover over main
current paths with sealing option
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Description of front panel view
Display elements
"Ready" signals and alarms
● "Ready" signal of the residual current device:
The LED labeled "ACT" stands for ACTIVE and lights up when the residual current device
is ready.
● Pre-alarm:
Both the Basic RCD320 and the Basic RCD520 feature an alarm LED labeled "AL" (pre-
alarm) which lights up promptly to indicate potential shutdown of the installation due to
residual current.
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LED displays
Tripped display
The <RESET> button is not only used to reset the residual current device, but also as a
mechanical indication that the unit has "tripped". If a residual current is detected or the
button <TEST> is pressed, the button <RESET> is automatically released and so signals
that the residual current device has tripped. Even when the residual current device is at zero
potential, the <RESET> remains in the "TRIP" position.
①
Residual current device is operating normally
and has not tripped
②
Residual current device has tripped
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Operator controls
Insulation tests
It is absolutely essential to isolate the evaluation electronics circuit while insulation tests are
in progress in order to protect the circuit against potential damage on the one hand and to
prevent detection of insulation faults due to the power pack on the other. This is done simply
by withdrawing (15 - 17 mm) the circuit breaker which is anchored in the enclosure.
Disconnection of the main conductor connections is thus unnecessary. On completion of the
tests, the circuit breaker must be pushed back into position before the residual current
device is commissioned.
Testing and resetting the residual current device
Testing
Depending on operating conditions, the test button on the front panel of the residual current
device should be pressed in order to function-test the device. The test button is labeled with
the letter "T". If the test button is pressed, the device is tested immediately irrespective of the
current delay time setting.
If the test button is pressed, a residual current is simulated on a test winding attached to the
summation current transformer. If the residual current device is functioning properly, it must
trip the molded case circuit breaker.
The test button must be held down for at least 2 seconds. The design of the test button
prevents unintentional actuation.
Note
The residual current device can be successfully tested only if it is connected to a voltage
equal to at least 85% of the minimum rated operational voltage.
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Resetting
If the residual current device trips the molded case circuit breaker due to a high residual
current or actuation of the test button, the <RESET> button on the RCD is released ("RCD"
mode must be selected). At the same time, the trip alarm switch which is mechanically
coupled with the <RESET> button also signals that a trip has occurred.
The <RESET> button is labeled with the letter "R".
The following actions must be taken in order to reset the residual current device and reclose
the main contacts of the molded case circuit breaker:
1. Press the <RESET> button on the residual current device.
The "tripped" signal at the signaling contacts is canceled, the residual current device is
now reset.
2. Reset and switch on the molded case circuit breaker.
Note
The molded case circuit breaker cannot be switched on before the <RESET> button on the
residual current device has been actuated and a residual current is no longer present
(IΔn > IΔ).
Parameterization of the residual current device
①
Setting button for response current IΔn
②
Setting button for delay time Δt (RCD520 only)
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Button for setting the response current IΔn
The response current can be set in eight steps, ranging from 0.03 A to maximum 5 A. Each
response current has a dedicated setting range. The corresponding response current is set
as soon as the button is latched in the setting range.
If the white setting arrow is resting between two setting ranges, the residual current device is
automatically set to 0.03 A for safety reasons.
If the response current is set to 0.03 A, the delay time setting is deactivated and the breaker
is tripped instantaneously in order to afford personal protection in the case of direct contact.
Note
In order to protect personnel, it is necessary to seal the transparent protective cover so that
the 30 mA setting range cannot be changed.
The factory setting for the response current is 0.03 A.
Button for setting the delay time Δt (RCD520 only)
The delay time on the RCD520 residual current device can be set in eight steps, ranging
from 0 (instantaneous) to a maximum value of 3000 ms.
Each delay time has a dedicated setting range. The corresponding delay time is set as soon
as the button is latched in the setting range.
If the white setting arrow is resting between two setting ranges, the residual current device
trips instantaneously in response to residual currents.
The factory setting for the tripping delay is 0 ms.
The delay time is not adjustable on the RCD320. The RCD320 always trips instantaneously.
Possible procedure for setting the response current and the delay time
1. Switch off the molded case circuit breaker.
2. Open the transparent protective cover over the setting buttons.
3. Adjust the setting values for response current and delay time on the residual current
device to the maximum value in each case.
4. Switch on the molded case circuit breaker.
The LED labeled "ACT" on the residual current device now lights up, the residual current
device is ready.
5. Reduce the setting for the response current until the LED labeled "AL" lights up.
The residual current is now 30% higher than the response current setting.
6. By turning the setting button clockwise, set the next higher response current.
The LED "AL" goes out, the correct response current is now set.
7. Set the required delay time.
8. Close the transparent protective cover over the setting buttons.
The device is now fully parameterized.
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Sealable protective covers of the residual current device
①
Contact hazard protective cover over main current paths and auxiliary contacts
②
Transparent protective cover over setting buttons
Transparent protective cover over setting buttons
In order to prevent unauthorized access to the setting buttons for IΔn and Δt, the transparent
cover over the settings buttons can be optionally sealed.
Note
In order to protect personnel, it is necessary to seal the transparent protective cover so that
the 30 mA setting range cannot be changed.
Contact hazard protective cover over main current paths and auxiliary contacts including
sealing option
After the residual current device RCD320 or RCD520 has been mounted on the 3VA1
molded case circuit breaker, a contact hazard protective cover is installed over the main
current paths to protect against direct contact. This cover can be sealed optionally in order to
block any attempt to dismantle the residual current device from the molded case circuit
breaker.
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Terminals
Note
Cables for the following terminals must be routed separately from the main circuits. Their
maximum cable length is 300 m.
A number of auxiliary contacts which perform different functions are located underneath the
contact hazard protective cover:
Alarm switch
TRIP-IND (TRIP INDICATOR)
A tripped signal can be output via the floating contact for display via a warning lamp, for
example. This trip alarm switch operates as soon as the residual current exceeds the
response current setting value and has therefore caused the residual current device to trip.
The standard trip alarm switch has changeover contacts and screw-type connections.
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The terminal designations of the relevant contact are shown in the diagram below.
Status indicators
The table below illustrates the behavior of pre-alarm and tripped signals on RCD320 and
RCD520 devices in response to various user actions and residual currents.
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Cable installation
Cable ducts for bringing out cables are provided to the left and right on the residual current
device.
①
Cable duct
Other labels on front panel
Approvals
The residual current device bears the CE mark. For an overview of all approvals, please
refer to Appendix (Page 647).
For all queries relating to approvals, please contact Technical Support (Page 10).
Technical specifications
In ≤ …A: Specifies the highest permissible rated operational current of the molded case
circuit breaker with which the residual current device may be combined.
Ue ∼ …V: Specifies the operating voltage range of the residual current device.
…Hz: Specifies the operating frequency range of the residual current device.
Denotes the response behavior to residual currents.
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Installation
Installation
Regardless of the type of connection technology installed on the 3VA1 molded case circuit
breaker, the residual current devices RCD320 and RCD520 are mounted on the load side
(i.e. beneath the thermal-magnetic trip unit) of the breaker:
1. Dismantle the loadside connection components of the molded case circuit breaker and
install the supplied connection components for the residual current device.
2. Insert the residual current device into the T slots of the molded case circuit breaker.
3. Push the residual current device backwards until its rear panel is flush with the rear panel
of the molded case circuit breaker.
4. Screw the molded case circuit breaker to the residual current device. Special connecting
screws are provided on the line side of the residual current device for this purpose.
5. Place a contact hazard protective cover over the circuit breaker/RCD assembly.
6. Reinstall the loadside connection components of the molded case circuit breaker at the
outgoing feeder end of the residual current device.
7. Attach the assembly to a mounting plate using the mounting screws.
Note
Since the outgoing feeder end of the residual current device has exactly the same
connection contours as the 3VA1 molded case circuit breaker, all connection accessories,
e.g. phase barrier, terminal cover, can also be mounted on the residual current device.
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Tripping
The molded case circuit breaker is tripped by means of a direct-acting tappet which engages
in the breaker mechanism from the residual current device. The electromagnetic trip unit is
integrated in the residual current device.
Function overview
The table below provides an overview of all the functions and data which are available in the
residual current device environment:
Value can be read
Value can be edited
Commands
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4.8.2.3
Loadside residual current device Basic RCD520B
Front view of the Basic RCD520B
①
Circuit breaker
⑪
Maximum rated operational current, rated
operational voltage and frequency
②
Type designation and standard
⑫
Transparent protective cover over setting
buttons
③
Approvals
⑬
Selection slide switch for
MONITORING / RCD mode
④
LED: ACTIVE, pre-alarm and MONITORING
⑭
Button for setting tripping characteristic type
B / type B+
⑤
Knowledge Manager
⑮
Setting button for response current
⑥
Rated insulation voltage and rated impulse
strength
⑯
Setting button for delay time
⑦
Location and date of manufacture
⑰
Test button (test device)
⑧
Device type
⑱
RESET button / tripped display
⑨
Product version
⑲
Auxiliary contacts
⑩
Article number
⑳
Contact hazard protective cover over main
current paths with sealing option
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Description of front panel view
Display elements
"Ready" signal, alarms and monitoring
● "Ready" signal of the residual current device:
The LED labeled "ACT" stands for ACTIVE and lights up when the residual current device
is ready to operate.
● Pre-alarm:
The Basic RCD520B features an alarm LED labeled "AL" which lights up promptly to
indicate potential shutdown of the installation due to residual current.
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● Monitoring:
The "MONITORING" LED indicates the operating mode of the RCD520B.
When the selection slide switch is set to "MONITORING", the "MONITORING" LED is lit
and the "ACT" LED flashes. RCD520B Basic functions purely as a display unit without a
tripping function.
LED displays
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Tripped display
In RCD mode, the <RESET> button is used not only to reset the residual current device, but
also as a mechanical indication that the unit has "tripped". If a residual current is detected or
the button <TEST> is pressed, the button <RESET> is automatically released and so signals
that the residual current device has tripped. Even when the residual current device is at zero
potential, the <RESET> remains in the "TRIP" position.
①
Residual current device is operating normally
and has not tripped
②
Residual current device has tripped
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Operator controls
Insulation tests
It is absolutely essential to isolate the evaluation electronics circuit while insulation tests are
in progress in order to protect the circuit against potential damage on the one hand and to
prevent detection of insulation faults due to the power pack on the other. This is done simply
by withdrawing (15 to 17 mm) the circuit breaker which is anchored in the enclosure.
Disconnection of the main conductor connections is thus unnecessary. On completion of the
tests, the circuit breaker must be pushed back into position before the residual current
device is commissioned.
Testing and resetting the residual current device
Testing
Depending on operating conditions, the test button on the front panel of the residual current
device should be pressed in order to function-test the device. The test button is labeled with
the letter "T". If the test button is pressed, the device is tested immediately irrespective of the
current delay time setting.
If the test button is pressed, a residual current is simulated on a test winding attached to the
summation current transformer. If the residual current device is functioning properly, it must
trip the molded case circuit breaker (in "RCD" mode).
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The test button must be held down for at least two seconds. The design of the test button
prevents unintentional actuation.
When the residual current device is in "MONITORING" mode, it behaves in the same way as
in RCD mode (e.g. when the tripped auxiliary switch operates), the only difference being that
the molded case circuit breaker is not tripped and the <RESET> button is not released.
Note
The residual current device can be successfully tested only if it is connected to a voltage
equal to at least 85% of the minimum rated operational voltage.
Resetting
If the residual current device trips the molded case circuit breaker due to a high residual
current or actuation of the test button, the <RESET> button on the RCD is released ("RCD"
mode must be selected). At the same time, the trip alarm switch which is mechanically
coupled with the <RESET> button also signals that a trip has occurred.
The <RESET> button is labeled with the letter "R".
The following actions must be taken in order to reset the residual current device and reclose
the main contacts of the molded case circuit breaker:
1. Press the <RESET> button on the residual current device.
The "tripped" signal at the signaling contacts is canceled, the residual current device is
now reset.
2. Reset and switch on the molded case circuit breaker.
Note
The molded case circuit breaker cannot be switched on before the <RESET> button on the
residual current device has been actuated and a residual current is no longer present
(IΔn > IΔ).
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Parameterization of the residual current device
①
Button for setting tripping characteristic type B / type B+
②
Setting button for response current I
Δn
③
Setting button for delay time Δt
Button for setting the tripping characteristic
This rotary switch can be used to change the tripping characteristic of the RCD520B
between type B (according to IEC 62423 and IEC 60947-2) and type B+ (according to
DIN VDE 0664-400 for IΔn = 30 to 300 mA and for frequencies over 1 kHz).
The same conditions apply for type B+ as for type B, i.e. the tripping characteristics of type B
and type B+ are identical up to 1 kHz. With device type B+ however, the frequency range for
the detection of residual currents extends up to 20 kHz. Tripping takes place below 420 mA
within this frequency range to provide increased fire protection. With type B, the tripping
threshold increases above 1 kHz to prevent spurious tripping due to discharge currents,
particularly in conjunction with frequency converters.
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Button for setting the response current IΔn
The response current can be set in 8 steps, ranging from 0.03 A to 0.3 A for type B+ and
0.03 A to maximum 5 A for type B (for detailed information, see "Overview of selection
settings in conjunction with IΔn"). Each response current has a dedicated setting range. The
corresponding response current is set as soon as the button is latched in the setting range.
If the white setting arrow is resting between two setting ranges, the residual current device is
automatically set to 0.03 A for safety reasons.
If the response current is set to 0.03 A, the delay time setting is deactivated and the breaker
is tripped instantaneously. in order to afford personal protection in the case of direct contact.
Note
In order to protect personnel, it is necessary to seal the transparent protective cover so that
the 30 mA setting range cannot be changed.
The factory setting for the response current is 0.03 A.
Button for setting the delay time Δt
The delay time on the RCD520B residual current device can be set in 10 steps, ranging from
0 (instantaneous) to a maximum value of 10000 ms.
Each delay time has a dedicated setting range. The corresponding delay time is set as soon
as the button is latched in the setting range.
If the white setting arrow is resting between two setting ranges, the residual current device
trips instantaneously in response to residual currents.
The factory setting for the delay time is 0 ms.
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Possible procedure for setting the response current and the delay time
1. Switch off the molded case circuit breaker.
2. Open the transparent protective cover over the setting buttons.
3. Adjust the setting values for response current and delay time on the residual current
device to the maximum value in each case.
4. Switch on the molded case circuit breaker.
The LED labeled "ACT" now lights up (RCD mode) on the residual current device or the
"ACT" LED flashes and the "MONITORING" LED lights up (monitoring mode); the
residual current device is ready.
5. Reduce the setting for the response current until the LED labeled "AL" lights up.
The residual current is now 30% higher than the response current setting.
6. By turning the setting button clockwise, set the next higher response current.
The LED "AL" goes out, the correct response current is now set.
7. Set the required delay time.
8. Close the transparent protective cover over the setting buttons.
The device is now fully parameterized.
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Selecting the operating mode
①
Selection switch for RCD / MONITORING mode
Two different operating modes can be selected using the selection switch on the RCD520B:
● RCD mode
The device functions as a residual current device in RCD mode. When IΔ > IΔn, the
residual current device trips the molded case circuit breaker by means of a plunger.
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Die <RESET> button on the residual current device releases, thus signaling that the
residual current device has tripped. At the same time, the trip alarm switch (TRIP-IND)
operates so that the tripped status can be transmitted to an indicator light in the panel
door, for example (see also Table "Scenario A" in chapter "Connecting terminals", section
"Status indicators").
The molded case circuit cannot be switched back on until the fault has been rectified and
the <RESET> button has been pressed.
The residual current device is set to RCD mode as supplied.
● MONITORING mode
In MONITORING mode, the device functions purely as a display unit. In this mode, the
"ACT" LED flashes and the "MONITORING" LED is lit.
If the residual current exceeds the response current set on the RCD520B, this does
not
result in tripping of the molded case circuit breaker. The <RESET> button also remains in
the depressed position and is
not
released. The trip alarm switch (TRIP-IND) operates
however. As soon as the residual current falls below the threshold again, the trip alarm
switch resets immediately (see also table "Scenario C" in chapter "Connecting terminals",
section "Status indicators").
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It is possible to switch between the two operating modes at all times, irrespective of whether
the RCD520B residual current device is operating in a running application. Proper
functioning of the selection switch is continuously monitored. In the event of a malfunction,
the device automatically switches to RCD mode internally, thereby excluding the possibility
of a safety-related risk.
Overview of selection settings in conjunction with IΔn:
1) Note: If IΔn = 0.03 A, the circuit breaker trips instantaneously irrespective of the setting of Δt.
Note
Observe the operating instructions.
Functional testing must be performed before the residual current device is put into operation.
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Sealable protective covers of the residual current device
①
Contact hazard protective cover over main current paths and auxiliary contacts
②
Transparent protective cover over setting buttons
Transparent protective cover over setting buttons
In order to prevent unauthorized access to the settings for IΔn, Δt, type B/B+ and
RCD/MONITORING mode, the transparent cover over the settings buttons can be optionally
sealed.
Note
In order to protect personnel, it is necessary to seal the transparent protective cover so that
the 30 mA setting range cannot be changed.
Contact hazard protective cover over main current paths and auxiliary contacts including
sealing option
After the residual current device RCD520B has been mounted on the 3VA11 molded case
circuit breaker, a contact hazard protective cover is installed over the main current paths to
protect against direct contact. This cover can be sealed optionally in order to block any
attempt to dismantle the residual current device from the molded case circuit breaker.
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Terminals
A number of auxiliary contacts which perform different functions are located underneath the
contact hazard protective cover:
Alarm switch
Floating auxiliary contacts for 2 different alarms are provided:
● TRIP-IND (TRIP INDICATOR)
A tripped signal can be output via this auxiliary switch, e.g. for connection to a warning
lamp. This trip alarm switch operates as soon as the residual current exceeds the set
response current, irrespective of whether the residual current device is in RCD or
MONITORING mode.
Since the relay for the tripped signal (TRIP-IND) is a bistable relay, the relay contact
states remain "stored" even in the event of a power outage. When the power supply
recovers, the indicated relay contact states are those which existed before the power
outage.
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● AL
Signaling switch for pre-alarm. This auxiliary switch operates as soon as the residual
current exceeds 30% of the operating current setting value. The relay for the pre-alarm
signal (AL) drops out again as soon as the residual current reaches or falls below the pre-
alarm threshold of 30%.
Since the relay for the pre-alarm signal (AL) is a monostable relay, the relay switches
back to the original state in the event of a power outage.
The standard auxiliary switches for pre-alarms and tripped signals have changeover contacts
and screw-type connections.
The terminal designations of the relevant contact, the maximum rated voltage and the
current carrying capacity are shown in the diagram below.
Each relay contact has a maximum rated operational current of 5 A at 250 V AC (AC-13).
The common terminal (11C = Common) is designed such that the maximum permissible
current of 5 A can be applied to both relay contacts (TRIP-IND and AL) simultaneously.
Note
Cables for the following terminals must be routed separately from the main circuits. Their
maximum cable length is 300 m.
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Use of signaling switches in SELV and PELV circuits:
The signaling switches TRIP-IND and AL meet the requirements for safety isolation
(including double insulation between the auxiliary current paths and the main circuit).
Requirement:
1. Molded case circuit breakers equipped with a residual current device are operated with a
rated operational voltage of 480 V AC.
2. The combination is installed at the distribution system level (overvoltage category III
according to DIN EN
-
60947-1 Annex H).
If these two requirements are met, the signaling switches are suitable for SELV and PELV
circuits.
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Status indicators
The table below illustrates the behavior of pre-alarm and tripped signals on RCD520B
devices in response to various user actions and residual currents.
Scenario A: Residual current device is in RCD mode, infeed at the top
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Scenario B: Residual current device is in RCD mode, infeed at the bottom
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Scenario C: Residual current device is in MONITORING mode, infeed at the top
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Scenario D: Residual current device is in MONITORING mode, infeed at the bottom
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Cable installation
Cable ducts for bringing out cables are provided to the left and right on the residual current
device.
①
Cable duct
Other labels on front panel
Approvals
The residual current device bears the CE mark. For an overview of all approvals, please
refer to Appendix.
For all queries relating to approvals, please contact Technical Support (Page 10).
Technical specifications
In ≤ …A: Specifies the highest permissible rated operational current of the mold-
ed case circuit breaker with which the residual current device may be
combined.
Ue ∼ …V: Specifies the operating voltage range of the residual current device.
…Hz: Specifies the operating frequency range of the residual current device.
Denotes the response behavior to residual currents.
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Installation
Installation
Regardless of the type of connection technology installed on the 3VA1 molded case circuit
breaker, the RCD520B residual current device is mounted on the load side (i.e. beneath the
thermal-magnetic trip unit) of the breaker:
1. Dismantle the loadside connection components of the molded case circuit breaker and
install the supplied connection components for the residual current device.
2. Insert the residual current device into the T slots of the molded case circuit breaker.
3. Push the residual current device backwards until its rear panel is flush with the rear panel
of the molded case circuit breaker.
4. Screw the molded case circuit breaker to the residual current device. Special connecting
screws are provided on the line side of the residual current device for this purpose.
5. Place a contact hazard protective cover over the circuit breaker/RCD assembly.
6. Reinstall the loadside connection components of the molded case circuit breaker at the
outgoing feeder end of the residual current device.
7. Attach the assembly to a mounting plate using the mounting screws.
Note
Since the outgoing feeder end of the residual current device has exactly the same
connection contours as the 3VA11 molded case circuit breaker, all connection accessories,
e.g. phase barrier, terminal cover, can also be mounted on the residual current device.
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Tripping
The molded case circuit breaker is tripped by means of a direct-acting tappet which engages
in the breaker mechanism from the residual current device.
Periodic self-test
In addition to manually checking the proper functioning of the residual current device by
pressing the test button, cyclic self-tests are performed inside the residual current device.
Checks are performed periodically, for example, to ensure that:
● the microcontroller is functioning properly
● the physical connection between the printed-circuit board and the maglatch is interrupted
● the current transformers and the detection electronics are functioning properly
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Function overview
The table below provides an overview of all the functions and data which are available in the
residual current device environment:
Value can be read
Value can be edited
Commands
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4.8.2.4
Loadside residual current device Advanced RCD820
The "Advanced" residual current devices of type RCD820 are available as an accessory for
3VA2 molded case circuit breakers.
Front view of Advanced RCD820
①
Circuit breaker
⑪
Product version
②
Auxiliary contacts
⑫
Article number
③
Type designation
⑬
Maximum rated operational current, rated
operational voltage and frequency
④
LED: ACTIVE, communication, pre-alarm
⑭
Setting button for response current
⑤
Tripped display
⑮
Transparent protective cover over setting
buttons
⑥
Knowledge Manager
⑯
Test button (test device)
⑦
Setting button for delay time
⑰
Approval
⑧
Rated insulation voltage and rated impulse
strength
⑱
Standard
⑨
Location and date of manufacture
⑲
RCD-to-ETU connecting cable
⑩
Device type
⑳
Contact hazard protective cover over main
current paths with sealing option
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Description of front panel view
Display elements
"Ready" signals, communication status and alarms
● "Ready" signal of the residual current device:
The LED labeled "ACT" ① stands for ACTIVE and lights up when the device is ready to
operate.
● Communication status:
The LED labeled "COM" ② stands for COMMUNICATION and indicates the
communication status of the residual current device.
● Pre-alarms:
The Advanced RCD820 has two LEDs labeled "AL1" (ALARM 1) ③ and "AL2" (ALARM
2) ③ which light up successively or simultaneously to promptly indicate potential
shutdown of the installation due to residual current.
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LED displays
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Tripped display
If the residual current device is tripped by a residual current, a remote trip command or
actuation of the test button, the trip is signaled mechanically on the RCD, i.e. by a rotating
disk.
①
Residual current device is operating nor-
mally and has not tripped
②
Residual current device has tripped
Note
In the case of infeed from below, an auxiliary switch must be connected by means of
auxiliary contacts CB-S to ensure correct functioning of the tripped display (for description,
see auxiliary contacts CB-S).
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Operator controls
Insulation tests
It is absolutely essential to isolate the evaluation electronics circuit while insulation tests are
in progress in order to protect the circuit against potential damage on the one hand and to
prevent detection of insulation faults due to the power pack on the other. This is done simply
by withdrawing (15 to 17 mm) the circuit breaker which is anchored in the enclosure.
Disconnection of the main conductor connections is thus unnecessary. On completion of the
tests, the circuit breaker must be pushed back into position before the residual current
device is commissioned.
Testing and resetting the residual current device
Testing
Depending on operating conditions, the test button on the front panel of the residual current
device should be pressed in order to function-test the device. The test button is labeled with
the letter "T". If the test button is pressed, the device is tested immediately irrespective of the
current delay time setting.
If the test button is pressed, a residual current is simulated on a test winding attached to the
summation current transformer. If the residual current device is functioning properly, it must
trip the molded case circuit breaker.
The test button must be held down for at least 2 seconds. The design of the test button
prevents unintentional actuation.
Note
The residual current device can be successfully tested only if it is connected to a voltage
equal to at least 85% of the minimum rated operational voltage.
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Resetting
The residual current device and the "tripped" display are reset by means of the handle of the
molded case circuit breaker, or the handle of the manual operator or by means of the motor
operator.
Parameterization of the residual current device
①
Setting button for response current IΔn
②
Setting button for delay time Δt
Button for setting the response current IΔn
The response current can be set in ten steps, ranging from 0.03 A to maximum 30 A. A
residual current of type A is detected within the 0.03 A to 10 A range. If the response current
is set to 30 A, the device detects only residual currents of type AC (i.e. purely sinusoidal
currents).
Each response current has a dedicated setting range. The corresponding response current
is set as soon as the button is latched in the setting range.
If the white setting arrow is resting between two setting ranges, the residual current device is
automatically set to 0.03 A for safety reasons.
If the response current is set to 0.03 A, the delay time setting is deactivated and the breaker
is tripped instantaneously. in order to afford personal protection in the case of direct contact.
Note
In order to protect personnel, it is necessary to seal the transparent protective cover so that
the 30 mA setting range cannot be changed.
The factory setting for the response current is 0.03 A.
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Button for setting the delay time Δt
The delay time can be set in ten steps, ranging from 0 (instantaneous) to a maximum value
of 10000 ms.
Each delay time has a dedicated setting range. The corresponding delay time is set as soon
as the button is latched in the setting range.
If the white setting arrow is resting between two setting ranges, the residual current device
trips instantaneously in response to residual currents.
The factory setting for the delay time is 0 ms.
Possible procedure for setting the response current and the delay time
1. Switch off the molded case circuit breaker.
2. Open the transparent protective cover over the setting buttons.
3. Adjust the setting values for response current and delay time on the residual current
device to the maximum value in each case.
4. Switch on the molded case circuit breaker.
The LED labeled "ACT" on the residual current device now lights up, the residual current
device is ready.
5. Reduce the setting for the response current until the LED labeled "AL1" lights up.
The residual current is now 30% higher than the response current setting.
6. By turning the setting button clockwise, set the next higher response current.
The LED "AL1" goes out, the correct response current is now set.
7. Set the required delay time.
8. Close the transparent protective cover over the setting buttons.
The device is now fully parameterized.
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Sealable protective covers of the residual current device
①
Contact hazard protective cover over main current paths and auxiliary contacts
②
Transparent protective cover over setting buttons
Transparent protective cover over setting buttons
In order to prevent unauthorized access to the setting buttons for IΔn and Δt, the transparent
cover over the settings buttons can be optionally sealed.
Note
In order to protect personnel, it is necessary to seal the transparent protective cover so that
the 30 mA setting range cannot be changed.
Contact hazard protective cover over main current paths and auxiliary contacts including
sealing option
After the residual current device RCD820 has been mounted on the 3VA2 molded case
circuit breaker, a contact hazard protective cover is installed over the main current paths to
protect against direct contact. This cover can be sealed optionally in order to block any
attempt to dismantle the residual current device from the molded case circuit breaker.
Terminals
Note
Cables for the following terminals must be routed separately from the main circuits. Their
maximum cable length is 300 m.
A number of auxiliary contacts which perform a broad range of functions are located
underneath the contact hazard protective cover.
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Alarm switch
Floating auxiliary contacts for 3 different alarms are provided:
● AL1
Signaling switch for pre-alarm threshold 1. This auxiliary switch operates as soon as the
residual current exceeds 30 % of the operating current setting value.
● AL2
Signaling switch for pre-alarm threshold 2. This auxiliary switch operates as soon as the
residual current exceeds 60 % of the operating current setting value.
● TRIP-IND (TRIP INDICATOR)
A tripped signal can be output via this auxiliary switch for connection to a warning lamp,
for example. The switch operates as soon as the residual current reaches or exceeds the
response current setting value and has therefore caused the residual current device to
trip.
Switches with changeover contacts and screw-type connections are used as standard as
auxiliary switches for pre-alarms and tripped signals.
The terminal designations of the relevant contact, the maximum rated voltage and the
current carrying capacity are shown in the diagram below.
Each relay contact has a maximum rated operational current of 5 A at 230 V AC. Since the
terminals have a maximum current carrying capacity of 13.5 A, the current flow across the
common terminal (01C = Common) must be limited to 13.5 A when all three signaling
switches are used.
The relays for the pre-alarm signals (AL1 and AL2) drop out again as soon as the residual
current reaches or exceeds the relevant pre-alarm thresholds.
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The relay for the tripped signal (TRIP-IND) drops out again as soon as the residual current
device is reset again by means of the molded case circuit breaker handle, or the handle of
the manual or motor operator.
Since the relay for the tripped signal (TRIP-IND) is a bistable relay, the relay contact states
remain "stored" even in the event of a power outage. When the power supply recovers, the
indicated relay contact states are those which existed before the power outage.
Other auxiliary inputs
Two further auxiliary inputs in the form of screw terminals are also provided:
REMOTE-T
The residual current device can be remotely tripped via this auxiliary input for test purposes
("Remote test button"), for example.
To utilize this function, the customer must connect, for example, a pushbutton (NO contact)
to terminals 1Y1 and 1Y2 by means of a two-core, twisted cable which must not be more
than 300 m in length. The switching contact should have a minimum breaking capacity of 5 V
/ 1 mA. The residual current device trips if the pushbutton is actuated for at least 2 seconds.
The terminals 1Y1 and 1Y2 are galvanically isolated from the mains supply (functional extra
low voltage, FELV).
In special cases, such as cable installation outdoors, the amplitude of overvoltages (e.g.
overvoltages due to thunderstorms) between the conductor and ground must be limited to
2.5 kV by suitable routing of the cable or other protection measures.
Each residual current device requires a separate NO contact and cable for remote tripping. It
is not possible to use one cable and connect two or more residual current devices in parallel.
It is necessary to use an unshielded cable or a shielded, twisted-pair cable with a maximum
capacitance of 36 nF as well as a maximum resistance of 50 ohms (total length out and
back).
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CB-S (Circuit Breaker Switch)
If the molded case circuit breaker / RCD820 assembly has an infeed from below (reverse
feed), it is absolutely essential to install an auxiliary switch (internal accessory, circuit
breaker with article number 3VA9988-0AA13) for interrogation of the circuit breaker status to
allow resetting of the tripped signal. In this case, the "
normally closed
contact", i.e. cable at
.1C and .2NC, of the changeover contact must be connected.
This switch is installed in the accessory compartment of the molded case circuit breaker. The
auxiliary switch is then connected to terminals 2Y1 and 2Y2 of the floating contact CB-S. It is
necessary to use an unshielded or shielded twisted-pair cable, no more than 1 m in length,
with a maximum capacitance of 36 nF as well as a maximum resistance of 50 ohms (total
length out and back).
When the molded case circuit breaker is reset and then switched on again, the contacts .1C
and .2NC of the auxiliary switch are closed and the tripped display on the residual current
device is reset.
The auxiliary switch is not included in the scope of supply and must be ordered separately.
The method for connecting the auxiliary switch to auxiliary contact CB-S is described in the
Operating Instructions for the RCD820 residual current device.
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Status indicators
The table below illustrates the behavior of pre-alarm and tripped signals on RCD820 devices
in response to various user actions and residual currents.
1) Infeed at top
2)
Infeed at bottom
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Cable installation
Cable ducts for bringing out cables are provided to the left and right on the residual current
device.
①
Cable duct
Other labels on front panel
Approvals
The residual current device bears the CE mark. For an overview of all approvals, please
refer to Appendix (Page 647).
For all queries relating to approvals, please contact Technical Support (Page 10).
Technical specifications
In ≤ …A: Specifies the highest permissible rated operational current of the molded case
circuit breaker with which the residual current device may be combined.
Ue ∼ …V: Specifies the operating voltage range of the residual current device.
…Hz: Specifies the operating frequency range of the residual current device.
Denotes the response behavior to residual currents.
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Installation
Installation
Regardless of the type of connection technology installed on the 3VA2 molded case circuit
breaker, the RCD820 is mounted underneath the electronic trip unit of the circuit breaker.
1. Dismantle the loadside connection components of the molded case circuit breaker and
install the supplied connection components for the residual current device.
2. Insert the residual current device into the T slots of the molded case circuit breaker.
3. Push the residual current device backwards until its rear panel is flush with the rear panel
of the molded case circuit breaker.
4. Screw the molded case circuit breaker to the residual current device. Special connecting
screws are provided on the line side of the residual current device for this purpose.
5. Place a contact hazard protective cover over the circuit breaker/RCD assembly.
6. Reinstall the loadside connection components of the molded case circuit breaker at the
outgoing feeder end of the residual current device.
7. Attach the assembly to a mounting plate using the mounting screws.
Note
Since the outgoing feeder end of the residual current device has exactly the same
connection contours as the 3VA2 molded case circuit breaker, all connection accessories,
such as phase barriers and terminal covers, can also be mounted on the residual current
device.
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Installation of the RCD-ETU connecting cable
1. Remove the contact hazard protective cover.
2. Open the slide over the interface <X3 RCD>.
The slide is fitted as a protective guard (e.g. to protect the interface against soiling).
3. Insert one end of the connecting cable into the interface on the residual current device.
The interfaces and the connecting cable are labeled to ensure that the cable ends are
inserted in the right interfaces.
Note
Plug in or remove the RCD-ETU cable only when the residual current device is
deenergized.
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4. Insert the other end of the connecting cable into the interface <X3 RCD> on the ETU.
The RCD-to-ETU connecting cable is free of silicone and halogen and is electrically isolated
from the main circuits.
The connecting cable is included in the scope of supply.
Tripping
The residual current device utilizes the maglatch of the electronic trip unit (ETU) in order to
trip the molded case circuit breaker. It therefore needs to be connected to the ETU of the
molded case circuit breaker. This connection is made by means of the RCD-ETU connecting
cable.
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Use of the residual current device as a pure display unit
The RCD820 residual current device can also operate as a pure display unit without a
tripping function, i.e. it detects and signals residual currents, but does not trip the molded
case circuit breaker or interrupt the circuit.
If the RCD820 device is to operate as a pure display unit, the connecting cable between the
residual current device and the ETU of the molded case circuit breaker can be omitted. With
the exception of its communications interface functionality, the residual current device can
perform all its normal functions (e.g. status signaling via LEDs or alarm switches) in "display
mode". Since there is no connection between the RCD and the ETU, the LED "ACT" flashes
continuously and the LED "COM" is not illuminated even if a 5-series or 8-series ETU is
installed.
Communications interface
The RCD-ETU connecting cable not only carries the trip command, but also acts as the
communications interface between the residual current device and the 3VA communication
system.
Precondition for interface functionality:
● The 3VA2 molded case circuit breaker is equipped with a communication-capable,
electronic trip unit (ETU 5-series or 8-series).
● The molded case circuit breaker is linked to the communication system via a COM060
communication module.
If the residual current device is linked to the communication system, the link can be used not
only to interrogate the device for important status, diagnostic, maintenance and identification
data, but also to transmit commands.
The residual current device is normally supplied with power by the main current paths. When
the molded case circuit breaker is switched off, the power supply will be interrupted if the
feed is at the top. In order to maintain the link to the communication system when the power
supply from the main current paths is disconnected, the residual current device is supplied
with the necessary power by the COM060 communication module.
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The table below provides an overview of all the functions and data which are available in the
residual current device environment:
Value can be read
Value can be edited
Commands
1) Reset by means of the molded case circuit breaker handle, or the handle of the manual or
motor operator
2)
Reset in combination with motor operators
3) On request
4.8.2.5
Special operating modes of residual current devices
Residual current devices also function in 1 and 2-phase operation. They are unrestricted in
functionality, including the test circuit, if at least 2 conductors are connected (2-pole
operation).
The phases can be selected freely.
Please note the following:
1. Adhere to the permissible rated operational voltage.
2. If a connection to the N pole (N) is made in a 4-pole MCCB-RCD assembly, the current
setting of the N pole determines the maximum current carrying capacity of the circuit.
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If the N pole is protected, the 100% setting (protection) is recommended with the
corresponding cable cross-section in the N pole. According to IEC 60947, the neutral
conductor must be connected to the designated terminal in the case of a 4-pole breaker.
Connecting a line conductor to the switching pole labeled N is not permitted.
3. The same conditions apply in 1 or 2-phase operation as in 3-phase operation with respect
to the parameter settings of the residual current device (IΔn or Δt) or the trip unit of the
molded case circuit breaker (e.g. Ir, Ii).
Connection of residual current device for 1-phase operation
The following 3 and 4-pole molded case circuit breakers equipped with a residual current
device can be operated in a single phase (L to N) with 2-pole switching:
● Loadside residual current devices for 3VA1: RCD320 and RCD520
Permissible rated operational voltage: 100 – 277 VAC 50/60 Hz
● Loadside residual current devices for 3VA2: RCD820
Permissible rated operational voltage: 100 – 400 VAC 50/60 Hz
Wiring example for 1-phase operation, 2-pole switching (3 and 4-pole molded case circuit
breakers)
①
3-pole
②
4-pole
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Connection of residual current device for 2-phase operation
The following 3 and 4-pole molded case circuit breakers equipped with a residual current
device can be operated in two phases (L to L) with 2-pole switching:
● Loadside residual current devices for 3VA1: RCD320 and RCD520
Permissible rated operational voltage: 127 – 480 VAC 50/60 Hz
● Side mounted residual current devices for 3VA1: RCD310 and RCD510
Permissible rated operational voltage: 127 – 480 VAC 50/60 Hz
● Loadside residual current devices for 3VA2: RCD820
Permissible rated operational voltage: 127 – 690 VAC 50/60 Hz
Wiring example for 2-phase operation, 2-pole switching (3 and 4-pole molded case circuit
breakers)
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4.8.2.6
Technical specifications
RCD type A
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1) 85 V AC minimum voltage (with phase to neutral conductor) for operation of the test function
2)
Reset by means of the circuit breaker handle
3) Via MO or SEO
4) Requirement: The 3VA2 molded case circuit breaker is equipped with an ETU 5-series or 8-series
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RCD type B
1) The 3-pole version of RCD520B is installed in a 4-pole enclosure
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4.8.3
Modular residual current device
Thanks to their design, the modular residual current devices (MRCD) type A 5SV8101-6KK
and type B (5SV8101-4KK, 5SV8111-4KK / 0 to 2000 Hz) are compatible with all molded
case circuit breaker designs and can therefore be combined with 3VA1 molded case circuit
breakers/switch disconnectors and with molded case circuit breakers from the 3VA2 range.
The MRCD is installed on a DIN rail (35 mm) as close as possible to the molded case circuit
breaker/switch disconnector.
Operating principle
The MRCD is connected to a summation current transformer through which all live
conductors (including neutral conductor where applicable) must be routed. The residual
current is detected in the summation current transformer and transferred to the MRCD. If this
current exceeds the limit value for the set rated residual current IΔn, the residual current
device trips the molded case circuit breaker/switch disconnector by means of a shunt trip or
undervoltage release.
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Front view
Parameterization of the MRCD
For a description of MRCD parameterization procedures and other operating options, please
refer to the operating instructions for the unit.
Summation current transformer
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Suitable summation current transformers
Depending on the rated operational current or maximum current of the circuit to be
monitored, the following summation current transformers can be used:
MRCD type A:
MRCD type B (5SV8101-4KK, 5SV8111-4KK / 0 … 2000 Hz):
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Alignment of conductors in the summation current transformer
In order to prevent measurement errors or spurious tripping, it is absolutely essential to
ensure that the conductors are properly aligned or arranged in the summation current
transformer.
Note
With MRCD type A, the summation current transformer used for the application must have
an inside diameter which is at least 1.5 times larger than the outside diameter of the
conductors which pass through it. With MRCD type B, the inside diameter must be at least 2
times larger.
If the combination MRCD, summation current transformer, trip unit and molded case circuit
breaker/switch disconnector is to be installed, the minimum clearances must be observed.
For more information, refer to the operating instructions.
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Combinations of molded case circuit breaker, MRCD and shunt trip/undervoltage release
Modular residual current devices, molded case circuit breakers, and shunt trips or
undervoltage releases UVR can be combined as indicated in the tables below:
MRCD type A:
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MRCS type B:
1) Cannot be combined with 3VA23 and 3VA24 molded case circuit breakers
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4.9
Communication and system integration
4.9.1
System description
Communication-capable 3VA molded case circuit breakers are presented in this chapter.
You will find out about the components that 3VA molded case circuit breakers require in
order to communicate, how these components are interconnected and what properties they
have.
The advantages of optimum integration of 3VA molded case circuit breakers into a software
or communication system are as follows:
● Acquisition of breaker status
● Remote control
● Remote parameterization
● Monitoring of capacity utilization
● Acquisition of consumption and performance data
● Local signaling via the EFB300 external function box
● Local visualization of 3VA molded case circuit breakers
A 3VA molded case circuit breaker can utilize all these functions only if a
COM060 communication module is installed in the 3VA breaker and connected to a
COM800 breaker data server for up to eight 3VA molded case circuit breakers, or a COM100
breaker data server for one breaker.
You can find detailed information on the communication module and breaker data server and
the communication link of the molded case circuit breaker in the 3VA Communication
System Manual.
4.9.2
Communication system of the 3VA molded case circuit breaker
The following components combine with the 3VA molded case circuit breaker to create a
communication system:
● Electronic trip unit (ETU)
● COM800 / COM100 breaker data server
● Optional expansion modules for three other communication networks
● COM060 communication module
● Draw-out unit with communication link
● Synchronizable motor operator SEO520
● EFB300 external function box (EFB)
● DSP800 display
● Commissioning and service software: powerconfig
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The diagram below presents the components which render a 3VA molded case circuit
breaker capable of communication.
Communication system architecture for 3VA
The central components of communication-capable 3VA molded case circuit breakers are
the ETUs 5-series or 8-series.
You can find additional information in the 3VA Communication System Manual. There the
components are regarded only as suppliers of information or receivers of commands.
Typical communication partners are:
● SIMATIC S7
● powermanager
While reference is frequently made to these systems, they are not an integral part of the 3VA
communication system.
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4.9.3
COM800 / COM100 breaker data server
The COM800/COM100 breaker data servers can be used to integrate communication-
capable 3VA molded case circuit breakers with ETUs 5-series and 8-series into
communication networks of various types.
● The COM800 breaker data server supports a maximum of eight 3VA molded case circuit
breakers
● The COM100 breaker data server supports one 3VA molded case circuit breaker
3VA molded case circuit breakers can be connected to higher-level communication networks
by the following methods:
● Direct Ethernet connection to Modbus TCP
● 7KM PAC PROFIBUS DP expansion module to PROFIBUS DPV1 / V2
● 7KM PAC Switched Ethernet PROFINET expansion module to PROFINET IO and
PROFIenergy, as well as Modbus TCP
● 7KM PAC RS 485 expansion module for Modbus RTU
3VA molded case circuit breakers are typically linked to the power monitoring software
powermanager or the automation concept TIA (Totally Integrated Automation) via a
communication network.
3VA molded case circuit breakers can also be connected to the commissioning and service
software powerconfig.
The 3VA molded case circuit breakers can also be linked to many non-Siemens systems
through such communication networks.
Furthermore, local visualization on the DSP800 display can be implemented with the
COM800/COM100 breaker data server.
Example: Configuration of the COM800/COM100 breaker data server with a 3VA-line of
three 3VA molded case circuit breakers and with connection to the power monitoring
software powermanager (left), to the DSP800 (center) and to the commissioning and service
software powerconfig (right).
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To establish a communication link, the COM800 or COM100 breaker data server is
connected via the 3VA-line to the COM060 communication module of the relevant circuit
breaker.
①
PAC expansion modules
②
T-connector
From a 24 V DC supply, the COM800/COM100 breaker data server supplies power to all the
connected 3VA molded case circuit breakers and the following components:
● COM060 communication module
● ETUs 5-series and 8-series
● Position signaling switch for draw-out socket
● 7KM PAC PROFIBUS DP expansion module
● 7KM PAC Switched Ethernet PROFINET expansion module
● 7KM PAC RS 485 expansion module
4.9.3.1
Area of application
The COM800/COM100 breaker data server can be used to link 3VA molded case circuit
breakers to:
● Power monitoring software powermanager
● Industrial automation systems
● Building automation systems
● Parameterization and breaker condition evaluation via communication link
● Maintenance systems
● MindSphere
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4.9.3.2
Features
Working in conjunction with the connected 3VA molded case circuit breakers with ETUs 5-
series and 8-series, the COM800/COM100 breaker data server supplies the following
information about the power distribution system:
● Condition of the 3VA molded case circuit breaker
● Tripping history with time stamp, cause of trip and number of trip events for breakers with
ETUs 5-series and 8-series
● Minimum and maximum values of measured variables
● Limit-value monitoring for measured variables in the 3VA molded case circuit breakers
● Load curves with power demands, e.g. 15-minute demands
● Energy values such as active energy (kWh) and reactive energy (kvarh)
● Power supply to connected 3VA molded case circuit breakers
● Three simultaneous communication connections via the integrated Ethernet interface
(e.g. DSP800, powermanager and, temporarily, powerconfig)
4.9.4
Communication with ETUs
Electronic trip units allow detailed setting of protection parameters from a central location.
They record measured variables and maintenance information in order to support power and
installation monitoring.
The electronic trip units (ETUs) provide the following protection functions:
● Overload protection L ("L" = Long time)
● Short-time delayed short-circuit release S ("S" = Short time) for time-selective response in
case of a short-circuit
● Instantaneous short-circuit release I ("I" = Instantaneous)
● Protection of the neutral conductor against overload and short-circuit ("N" = neutral)
● Protection against residual currents to ground G ("G" = Ground fault)
4.9.4.1
Area of application
Communication-capable ETUs are deployed for any application which requires the following
functions:
● Diverse protection functions
● Finer setting options for protection functions
● Metering functions
● For 50 and 60 Hz networks (45 to 65 Hz)
● The communication option provides a wide range of information about the status of the
molded case circuit breaker, as well as the actual measured values.
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4.9.5
DSP800 display
The DSP800 display is designed for mounting in the panel door and can be optionally
connected to the Ethernet (Modbus TCP) interface integrated in the COM800 / COM100
breaker data server. The DSP800 display shows the data of the breaker data server and
thus the data of up to eight connected 3VA molded case circuit breakers.
The start page of the DSP800 displays the status and maximum current of all 3VAs. All the
detailed information about individual molded case circuit breakers can be selected via the
efficiently structured menu. This includes
● Measured values of ETU 5-series and 8-series
● ETU setting parameters
● Status
● Diagnostics
With firmware version 2.07, up to three 3WL10 / 3VA27 circuit breakers can also be shown
on the DSP800 display. It must be noted that a maximum of 8 breakers can be displayed.
Templates for 1, 2, 4 and 8 breakers are available as default screens. These can either be
selected and arranged automatically or they can be manually assigned. In addition, the
measured values to be displayed can be selected in the overview.
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4.9.6
Commissioning and testing of electronic trip units using powerconfig
powerconfig
powerconfig performs the following functions for 3VA molded case circuit breakers:
● Parameterization of 3VA ETUs and other 3VA components
● Testing of 3VA
● Commissioning of 3VA
● Statistical analysis of 3VA
● Readout of measured variables such as energy, current, voltage and power from 3VA
molded case circuit breakers
● Readout of minimum and maximum values from 3VA molded case circuit breakers
● Diagnostics of 3VA
The PC on which powerconfig is installed is connected to the 3VA molded case circuit
breaker by means of the COM800 / COM100 breaker data server (optionally with modules)
or the TD500 test device.
The TD500 test device is required in order to perform function tests. You can find more
detailed information on the TD500 test device in chapter TD500 test device (Page 513).
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3VA molded case circuit breakers and, in some cases, other devices supported by
powerconfig are combined in powerconfig to form a project if they are related to one another
from a technical, organizational or some other perspective.
Electronic trip units (ETU), the EFB300 external function box and the communication
structure can be commissioned easily by means of the powerconfig software. On completion
of the commissioning process, the ETU settings can be stored as a project on the PC and
printed out.
powerconfig can also be used to perform ETU trip tests. A test report is generated
automatically and stored in the project every time a test is carried out.
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powerconfig supports a variety of different device communication links depending on the
SENTRON device used:
● USB
● Ethernet (Modbus TCP)
● PROFINET
● PROFIBUS
● MODBUS RTU
The possible means of connection of the COM800 / COM100 breaker data server are
described in detail in the 3VA Communication system manual (see Reference documents
(Page 10)).
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With 3VA molded case circuit breakers and 3-series ETUs, powerconfig is linked to the ETU
interface via the USB interface on the PC and the interface on the TD500 test device.
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4.9.7
Power management with powermanager
For power and plant monitoring, Siemens offers the powermanager software. Together with
SENTRON protection devices such as 3VA, 3WL and PAC measuring devices as well as
non-Siemens devices, powermanager provides a power monitoring system for reducing
energy costs and increasing energy availability.
powermanager acquires the measured variables that are needed to optimize power
consumption and so reduce costs. These variables not only include energy and power
values, but also electrical parameters such as current, voltage, or power factor. Not only is
this system able to display values, but also to monitor and archive them for later analysis. In
addition, the load monitoring function is capable of monitoring a specified setpoint and
making recommendations as to which loads should be connected and disconnected.
Identifying savings potential
The power monitoring software has been tested by the TÜV Rheinland for its suitability to
support an energy management system in accordance with ISO 50001.
Functionality and user-friendliness
The salient features and functions of the power monitoring software are as follows:
● Good scalability
● Enhanced report templates
● Response plans
● Mass parameterization
● Virtual measuring points for computing customer-specific parameters
● Load monitoring function for monitoring specified power limits for freely definable time
periods
● Switching recommendations in the event of limit violations
● Remote control of circuit breakers
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4.10
EFB300 external function box
4.10.1
General information
3VA molded case circuit breakers equipped with the electronic trip unit systems ETU 3-
series, ETU 5-series and ETU 8-series can be optionally upgraded with an EFB300 external
function box.
The EFB300 external function box receives information from the ETU via a cable connection.
This information can be used to output active trip alarms and tripping reasons (configurable
using powerconfig) via four digital outputs.
Zone selective interlocking ZSI (see chapter Zone selective interlocking (ZSI) (Page 82)) can
also be implemented via the EFB300. The EFB300 also supplies the ETU with power which
means that the ETU can be parameterized via the display even when a 3VA molded case
circuit breaker is in the de-energized state.
①
LED display
②
<SET> button
ZSI Zone selective interlocking
DI Digital input
DO 0 … 3 Digital output
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4.10.2
Power supply
The EFB300 external function box must be operated on a 24 V DC power supply unit. It acts
as a power supply for the connected ETU. This allows the ETU to remain operational even
when a 3VA molded case circuit breaker has tripped.
4.10.3
Functions of the digital input and digital outputs
Functions of the digital input
Two different functions can be implemented using the digital input:
● Tripped signals in the ETU can be reset (this also removes the reason for the tripped
signal from the ETU display and the default screen is displayed again).
● Information from a digital input can be made available via the communication interface of
the COM800/COM100 breaker data server, e.g. the status of a door contact transmitter.
Functions of the digital outputs
With the powerconfig software application, it is possible to selectively assign signals
transmitted by the connected ETU to the four digital outputs of the EFB300. powerconfig can
be accessed via the TD500 test device or by means of the COM800 or COM100 breaker
data server through the interface to the communication system.
The following signals (dependent on the ETU) can be assigned:
●
All the trip causes of the ETU
– Overload L
– Overload L in the neutral conductor
– Short-time delayed short circuit S
– Instantaneous short circuit I
– Ground-fault protection G
– Overtemperature
– Blocking protection (with motor protection)
– Idle running protection (with motor protection)
– Phase failure protection (with motor protection)
– RCD trip
– Group signal for trip due to short circuit (i.e. S or I)
This makes it possible to differentiate between overload and short circuit. This is an
important criterion for the question "May I reconnect?".
– Group alarm for trip by ETU
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●
Warnings
– Alarm level AL1 (90% Ir)
– Alarm level AL2 (105% Ir)
– Temperature alarm
– Load shedding or load pick up
By means of the load shedding and load pick up signals, a load can be switched off or
connected automatically depending on the capacity utilization of the 3VA molded case
circuit breaker.
– Ground-fault alarm
– Internal ETU fault
– Group signal for all warnings
– Pre-trip for overload
This warning appears 200 ms before an overload trip. This allows the user to bring
frequency converters into a safe state, for example.
●
Remote control
– The four digital outputs can be controlled directly from the fieldbus/Ethernet.
Possible application: Control of an MO320 motor operator without communication
capability
●
Limit values (4)
– The 8-series ETUs offer a total of four limit value settings. Almost all measured values
are available for monitoring. These can be assigned a hysteresis and an additional
time delay. In the event of upward or downward violation of the set measured value, a
limit value violation is generated which can be output via the EFB300 outputs and also
transmitted via the communication system.
One possible example is to signal the measured frequency in a combined heat and
power plant.
●
Energy pulse
(with ETU 8-series only)
An energy pulse (S0 signal pulse) contains information pertaining to the consumption of a
specific quantity of energy. The data are transmitted by weighted pulses, i.e. a specific
number of pulses are transferred to represent one kWh unit.
Settings for the energy pulse, see table on next page.
Example of energy pulse:
Energy meter source: Active energy kWh
Pulses per unit: 5
Unit: 20 kWh
Pulse length: 30 ms
Output of 140 kWh: Output of 35 pulses, each 30 ms in length
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Overview of functions available with EFB300 external function box
1) ETU860M (starter protection and motor protection)
2) ETU350M (motor protection)
3)
ETU550M (motor protection)
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Default output assignments
The four outputs of the EFB300 are automatically assigned factory defaults in ETUs with
firmware version 4.2 and higher.
4.10.4
Zone selective interlocking (ZSI)
Description
Microprocessor-controlled, zone selective interlocking (ZSI) has been developed in order to
control the total breaking time in low-voltage networks with multiple molded case circuit
breakers connected in series.
Advantage of ZSI:
Regardless of the number of series-connected molded case circuit breakers, all short circuits
in the network can be cleared within a maximum time period of 50 ms. Short-circuit
clearance times should be minimized, particularly in the case of system short circuits of very
large magnitude.
Note
Backward compatibility
The ZSI function is backward-compatible with the ZSI function of the 3WL molded case
circuit breakers.
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Connection
Use of the ZSI function is conditional upon the connection of a dedicated EFB300 external
function box to each 3VA2 molded case circuit breaker. The EFB300 allows molded case
circuit breakers to communicate with one another, a capability which is a basic requirement
for the ZSI function.
To permit utilization of the ZSI function, EFB300 external function boxes must be
interconnected as illustrated below:
See also
Zone selective interlocking (ZSI) (Page 82)
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4.10.5
<SET> button
The <SET> button performs the following functions depending on mode:
● Operating mode: Acknowledgment of signals
● Test mode: Execution of a test function
Operating mode
The EFB300 external function box is in operating mode during operation. Operation of the
EFB300 is indicated by steady illumination of the LED labeled "ACT".
If a tripped signal is present at an output (output is activated), the user can acknowledge the
signal or reset the output. This can be done by various methods:
● By application of a signal to the digital input of the EFB300
● By brief actuation of the <SET> button on the EFB300
● By actuation of the <ESC> button on the ETU
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LED states in operating mode
Steady illumination
Flashing
Off
Simultaneous flashing of all LEDs indicates that the EFB300 is defective.
Flashing
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Test mode
All inputs and outputs can be activated or deactivated manually in test mode. This can be
done to determine whether the digital outputs and the ZSI bus are functioning properly and
wired correctly.
The LED labeled "ACT" flashes to indicate that test mode is active. The powerconfig
software can also be used to test outputs.
Activating test mode and performing tests
1. In order to activate test mode, press the <SET> button for at least 2 seconds ① until all
the LEDs for the outputs light up briefly ②. Test mode is activated when the LED labeled
"ACT" starts to flash ③.
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2. Press the <SET> button briefly.
LED "ZSI_OUT" flashes, the ZSI output is selected.
3. In order to activate the selected output, press the <SET> button for longer than
2 seconds.
The LED of the selected output changes from flashing to steady illumination to indicate
activation of the selected output.
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4. In order to deactivate the output again, press the <SET> button again for longer than
2 seconds.
The LED of the activated output will change from steady illumination to flashing. The
output is deactivated, but still selected.
5. In order to select the next output, press the <SET> button briefly ①.
The LED of the next output starts to flash ②, the output is selected.
6. Repeat steps 3 to 5 in order to check the wiring of all digital outputs in succession.
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Terminating test mode
If the <SET> button is not pressed for a period of three minutes after selection of an output,
test mode is terminated automatically and the EFB300 reverts to operating mode.
Alternative method: After working through the entire menu structure (only the LED labeled
"ACT" flashes), press the <SET> button for longer than 2 seconds.
LED states in test mode
Steady illumination
Flashing
Off
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4.10.6
Technical specifications
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4.11
Test devices
Test devices are required in order to perform local tests on 3VA2 molded case circuit
breakers equipped with electronic trip units (ETUs).
Two versions of the test devices are available:
● TD300 activation and trip box
● TD500 test device
Functional scope of test devices
1) One energy transformer, one Rogowski coil
2) Via powerconfig
4.11.1
TD300 activation and trip box
The TD300 activation and trip box is a mobile, battery-operated local test device. Its purpose
is:
● To supply the ETU with power so that the ETU can be parameterized when the molded
case circuit breaker is switched off and de-energized.
● To test and service the electronic trip unit (ETU).
The power supply is provided by two AA batteries included in the scope of supply.
The TD300 activation and trip box is designed for ease of handling with dimensions of
76 x 107 x 25 mm (W x H x D).
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Description of the TD300 activation and trip box
①
LED "ACT" for indicating the battery status
②
Slide switch ON/OFF
③
<TRIP> pushbutton for testing the molded case circuit breaker
④
2 1.5 V AA batteries
⑤
Plug-in connector for insertion in the test socket on the ETU
4.11.1.1
Operation and execution of the TD300 tripping function
CAUTION
Personal injury, spurious tripping and irreparable damage to the TD300 activation and trip
box
Use of the TD300 when the molded case circuit breaker is not de-energized can result in
personal injury, spurious tripping of the circuit breaker and irreparable damage to the
TD300.
Disconnect the molded case circuit breaker from the power supply before using the TD300
activation and trip box.
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TD300: Connect, switch on and off, disconnect
Connect the TD300 to the 3VA2 molded case circuit breaker
1. Disconnect the molded case circuit breaker from the power supply.
2. Insert the connecting cable in the test socket of the ETU.
Switch the TD300 on and off
1. Check whether the molded case circuit breaker is disconnected from the power supply. If
it is not, disconnect it.
2. Push the slide switch to ON.
The LED labeled "ACT" on the TD300 lights up and the ETU display is activated. The
TD300 is ready.
If the "ACT" LED does not light up:
– Push the slide switch to OFF.
– Detach the connecting cable from the molded case circuit breaker.
– Replace the batteries.
– Follow the correct sequence of steps to connect the unit to the molded case circuit
breaker again.
– Push the slide switch to ON.
3. Push the slide switch to OFF.
The LED labeled "ACT" on the TD300 goes out to indicate that the unit is switched off.
Disconnect the TD300 from the 3VA2 molded case circuit breaker
1. Switch off the molded case circuit breaker (OFF position).
2. Detach the connecting cable from the molded case circuit breaker.
LED states when the TD300 and the molded case circuit breaker are switched on
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Test the molded case circuit breaker (mechanical trip test)
1. Connect the TD300 to the molded case circuit breaker in the correct sequence and switch
on.
2. Switch on the molded case circuit breaker (ON position).
3. Press the pushbutton labeled <TRIP> on the TD300.
The molded case circuit breaker trips
:
The molded case circuit breaker is functioning correctly.
The molded case circuit breaker does not trip
:
– Switch off the TD300.
– Switch off the molded case circuit breaker (OFF position).
– Detach the connecting cable from the molded case circuit breaker.
– Connect the TD300 correctly to the molded case circuit breaker again and switch on.
– Repeat the trip test (by pressing the pushbutton labeled <TRIP> on the TD300).
– If the molded case circuit breaker fails to trip again, contact Technical Support
(Page 10) .
4.11.1.2
Technical specifications of TD300
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4.11.2
TD500 test device
The TD500 mobile test device can be used to test the different causes of ETU trips. It is
therefore useful for checking the proper functioning and correct wiring of all connected
system components before the 3VA2 molded case circuit breaker is commissioned. The
system behaves as it would in the case of a real trip event. The molded case circuit breaker
trips when the set delay times expire and signals all alarms and tripped signals from
connected components.
Benefits of the TD500 test device
● A TD500 test device via powerconfig can be used to successively parameterize all
3VA2 molded case circuit breakers directly in situ.
● The device can store up to 100 test results.
● Using the TD500 test device and the powerconfig software, it is possible to read out all
diagnostic data of the 3VA2 molded case circuit breaker either digitally or as a hardcopy.
● In addition, test functions can be performed directly on the PC with the powerconfig
software.
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Description of the TD500
①
Plug-in connector for insertion in the test socket on the ETU
②
TD500-to-ETU connecting cable
③
TD500 test device
④
Power supply unit
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①
Connecting cable for ETU
⑨
Pushbutton for transformer test
②
LED "LOG" (available memory status)
⑩
Pushbutton for instantaneous short-circuit trip
test I
③
LED "RESULT"
⑪
Pushbutton for short-time delayed short-
circuit test S
④
Pushbutton for neutral trip test N
⑫
Pushbutton for overload trip test L
⑤
Pushbutton for ground fault trip test G
⑬
Pushbutton for ETU Power ON/OFF
⑥
Pushbutton for meter test (current measure-
ment display)
⑭
LED "ACT" (status)
⑦
PC connection
⑮
LED "COM" (communication status)
⑧
Mains cable connection
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LED display
Interfaces of the TD500 test device
The diagram below shows the physical interfaces of the TD500 test device.
①
Top of unit: Connection to 3VA2 molded case circuit breaker
②
Bottom of unit on right: 24 V DC supply
③
Bottom of unit on left: Connection to PC
Compatibility with molded case circuit breakers
The TD500 test device can be connected to all 3VA2 molded case circuit breakers equipped
with ETU 3-series, 5-series and 8-series. The connecting cable from the test device is
inserted in the test socket of the ETU.
Accessories
4.11 Test devices
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 517
Data stored in the TD500
The following data are stored in the TD500:
● Article number
● ETU parameter settings
● Causes of ETU trips
Note
Readout of data and clearing of the internal memory of the TD500
Using a PC and the powerconfig software, you can read these data out of the TD500 and
clear its internal memory.
Test functions of the TD500
The relevant pushbutton must be pressed in order to start a specific test. The molded case
circuit breaker is tripped electronically when the pushbutton is actuated. This is essential to
allow effectual testing of the electronic and mechanical control elements of the circuit
breaker.
Accessories
4.11 Test devices
3VA molded case circuit breakers with IEC certificate
518 Manual, 03/2019, A5E03603177010-03
4.11.2.1
Operation and execution of test functions
Connecting and disconnecting the TD500
CAUTION
Personal injury, malfunctions and false test results
Failure to connect the TD500 test device to the molded case circuit breaker according to
the sequence of steps specified below can result in personal injury, malfunctions and false
test results.
Disconnect the molded case circuit breaker from the power supply before connecting the
TD500.
Strictly adhere to the sequence of steps described below for connecting the two devices.
Connecting the TD500 to the 3VA2 molded case circuit breaker
1. Disconnect the molded case circuit breaker from the power supply.
2. Insert the connecting cable in the socket on top of the TD500 test device.
3. Insert the connecting cable in the test socket of the ETU.
4. Insert the cable of the power supply unit in the socket on the bottom of the TD500 test
device.
5. Connect the power supply unit to a socket.
The TD500 test device is now switched on and ready.
6. Press the pushbutton labeled <ETU Power ON/OFF> on the TD500 test device.
The ETU is now powered via the TD500 and activated. Successful communication
between the TD500 and ETU is indicated by illumination of the LED labeled "COM" on
the TD500.
All test functions available for the connected ETU are indicated by illumination of the
appropriately labeled LEDs.
Example: The L, S and I releases, the transformers (TRANS) and the current meter
(METER) can be tested on the ETU:
Accessories
4.11 Test devices
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 519
Disconnecting the TD500 from the 3VA2 molded case circuit breaker
1. Switch off the 3VA2 molded case circuit breaker.
2. Press the pushbutton labeled <ETU Power ON/OFF> on the TD500 test device.
The LED labeled "COM" on the TD500 goes out. The ETU is now no longer powered via
the TD500 and is deactivated.
3. Disconnect the power supply unit from the socket.
4. Detach the power supply unit cable from the TD500.
5. Detach the connecting cable between the TD500 and the ETU.
Test tripping functions L, S, I, N and G
1. Connect the TD500 to the 3VA2 molded case circuit breaker as described above.
2. Switch on the 3VA2 molded case circuit breaker.
3. To test the tripping function, press one of the pushbuttons <L>, <S>, <I>, <N> or<G on
the TD500 test device.
– When a pushbutton is pressed, its LED flashes while the test is in progress.
– The ETU trips when the set trip times expire and the molded case circuit breaker
switches from "ON" to "TRIP".
– On completion of the test, the LED of the selected pushbutton changes from flashing
to steady illumination.
4. Wait for the test to end and evaluate the test result by the status of the LED labeled
"RESULT":
Test was successful
:
The LED "RESULT" lights up green.
Test was unsuccessful
:
The LED "RESULT" flashes red.
Repeat the test. If the test fails again, contact Technical Support (Page 10) .
5. Press the pushbutton for the same tripping function again in order to confirm the test
result and restore the TD500 to its initial state.
6. Switch on the molded case circuit breaker again (ON position) in order to carry out further
tripping function tests.
Accessories
4.11 Test devices
3VA molded case circuit breakers with IEC certificate
520 Manual, 03/2019, A5E03603177010-03
Example: Testing the tripping function L on an ETU550 LSI
1. Connect the TD500 test device to the 3VA2 molded case circuit breaker.
2. Switch on the 3VA2 molded case circuit breaker.
3. Press pushbutton <L> on the TD500 test device.
The LED in the pushbutton <L> starts to flash.
4. Wait until the LED in the pushbutton <L> changes from flashing to steady illumination.
The test is completed.
5. Evaluate the test result by the status of the LED labeled "RESULT":
LED "RESULT" is
illuminated steadily in green: The test was successful
.
LED "RESULT" flashes
red: The test was unsuccessful
and must be repeated
.
If the test
fails again, contact Technical Support (Page 10) .
6. Press the pushbutton <L> again in order to confirm the test result and restore the TD500
to its initial state.
Accessories
4.11 Test devices
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 521
Carry out a meter test
The purpose of the meter test is to determine whether the ETU is measuring and displaying
current correctly. A test current of 0.4 x In is fed into the ETU. The current value measured by
the ETU is then checked to confirm that it matches the test current.
Note
The molded case circuit breaker does
not
need to be switched to position "ON" for this test.
Execute the test
1. Connect the TD500 test device to the 3VA2 molded case circuit breaker.
2. Press the pushbutton labeled <METER> ①.
The LED in the <METER> pushbutton begins to flash. The test takes approximately
30 seconds.
3. Wait until the LED in the pushbutton <METER> changes from flashing to steady
illumination.
The test is completed.
4. Evaluate the test result by the status of the LED labeled "RESULT":
LED "RESULT" is
illuminated steadily in green: The test was successful
.
LED "RESULT" flashes
red: The test was unsuccessful
and must be repeated
.
If the test
fails again, contact Technical Support (Page 10) .
5. Press the pushbutton <METER> again in order to confirm the test result and restore the
TD500 to its initial state.
Test transformers
This procedure tests the transformers (energy transformer or Rogowski coil) to determine the
following:
● Are transformers installed in the ETU?
● Are transformers correctly installed in the ETU?
● Are the installed transformers functioning correctly?
Note
In order to carry out this test, it is absolutely essential to disconnect all external power
supplies (e.g. EFB300, COM800, COM100, 24 V module) to the electronics.
Accessories
4.11 Test devices
3VA molded case circuit breakers with IEC certificate
522 Manual, 03/2019, A5E03603177010-03
Execute the test
1. Disconnect all external power supplies to the electronics.
2. Connect the TD500 test device to the 3VA2 molded case circuit breaker.
3. Switch on the 3VA2 molded case circuit breaker.
4. Press the pushbutton labeled <TRANS> ①.
The LED in the <TRANS> pushbutton begins to flash. The test takes several seconds.
5. Wait until the LED in the pushbutton <TRANS> changes from flashing to steady
illumination.
The test is completed.
6. Evaluate the test result by the status of the LED labeled "RESULT":
LED "RESULT" is
illuminated steadily in green: The test was successful
.
LED "RESULT" flashes
red: The test was unsuccessful
and must be repeated. If the test
fails again, contact Technical Support (Page 10) .
7. Press the pushbutton <TRANS> again in order to confirm the test result and restore the
TD500 to its initial state.
4.11.2.2
Executing the test functions using a PC and powerconfig
In addition to its capabilities as a stand-alone test device, the TD500 can also act as a PC
interface to the ETU.
If the TD500 test device is connected both to the ETU and a PC, the protective functions can
be triggered from a PC on which the powerconfig software is installed. A test log for the
molded case circuit breaker is generated and stored in the powerconfig project. The test log
can be printed out.
Accessories
4.11 Test devices
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 523
Connections between ETU - TD500 - PC
①
Plug-in connector for insertion in the test
socket on the ETU
④
Power supply unit
②
TD500-to-ETU connecting cable
⑤
USB connecting cable
③
TD500 test device
⑥
PC with powerconfig installed
4.11.2.3
Parameterizing using the powerconfig software
In addition to test functions, the powerconfig software package also provides tools for
assigning parameters to ETU 5-series and 8-series.
These tools allow you to:
● assign parameters to ETU 5-series and 8-series
● store parameter settings for ETU 5-series and 8-series in the powerconfig project and
print them out
Accessories
4.11 Test devices
3VA molded case circuit breakers with IEC certificate
524 Manual, 03/2019, A5E03603177010-03
4.11.2.4
Technical specifications of TD500
Accessories
4.12 External current transformer for N conductor
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 525
4.12
External current transformer for N conductor
The external current transformer for the N conductor is a current transformer for 3-pole 3VA2
molded case circuit breakers with 5-series and 8-series ETUs.
This transformer can be used to provide protection for the N conductor against overload as
well as for ground-fault protection.
4.12.1
Parameterization of the external N transformer
N conductor protection against overload
The function "N conductor protection IN" is deactivated ("OFF") as standard (factory setting)
in 5-series and 8-series ETUs.
If an external N transformer is connected to 5-series or 8-series ETUs, the "N conductor
protection IN" must be manually activated on the ETU and adjusted according to system
requirements.
Ground-fault protection
If the external N conductor is used with 5-series or 8-series ETU variants with ground-fault
protection, ETU560 and ETU860, no parameterization is required at the user end. As soon
as the external N transformer is connected to the ETU, the N conductor is also automatically
monitored for ground-fault protection.
Accessories
4.12 External current transformer for N conductor
3VA molded case circuit breakers with IEC certificate
526 Manual, 03/2019, A5E03603177010-03
4.12.2
External current transformer for front busbar connector up to 630 A
Technical specifications
Accessories
4.12 External current transformer for N conductor
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 527
4.12.3
External current transformer as straight-through transformer up to 1250 A
Technical specifications
Accessories
4.13 Escutcheon
3VA molded case circuit breakers with IEC certificate
528 Manual, 03/2019, A5E03603177010-03
4.13
Escutcheon
Molded case circuit breakers or supplementary motor operators or front mounted rotary
operators for molded case circuit breakers are often installed in panels or distribution boards
in such a way that only the operating device is directly accessible. Busbars, cables and the
termination area of the molded case circuit breaker are covered by metal or plastic plates in
order to prevent direct contact with live components. The panel door itself is often designed
as a protective cover.
Cutouts must be made in these covers
● in order to allow access to control elements,
● which are designed to prevent direct contact with cables, and
● which are large enough in size that the cover can be closed easily.
All these requirements necessitate gap dimensions of a few millimeters between the cutout
and the unit.
Cover frames are installed in cases where the gap size needs to be minimized and the gaps
covered. The use of cover frames makes for a clean-lined, attractive panel front face and
provides a higher degree of protection (IP30).
4.13.1
Product description
Cover frames are available for the following items of equipment from the 3VA product range:
● 3VA1 / 3VA2 molded case circuit breakers, 3-pole or 4-pole: Handle area only
●
3VA1 / 3VA2 molded case circuit breakers, 3-pole or 4-pole: Area around handle and trip unit
● Front mounted rotary operator
● Motor operators
● Loadside residual current devices, 3-pole or 4-pole
● Door feedthroughs
Accessories
4.13 Escutcheon
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 529
Installation
1. Cut out an opening in the cover plate.
Refer to the operating instructions for the correct cutout dimensions.
2. Insert the cover frame into the cutout from the front and fasten by means of small spring
steel sheets at the rear of the cover plate.
The fastening system is designed such that the the cover frame can move in the cutout. In
other words, the cover frame is "float-mounted". Tolerance compensation in the range
± 3 mm / ± 0.12" is thus possible in the horizontal direction and in the range ± 6 mm / ± 0.24"
in the vertical direction. On the one hand, this tolerance compensation is required to achieve
the small gap dimension of max. ± 0.5 mm / ± 0.19" between the cover frame and device. On
the other hand, it is needed to compensate for tolerances, e.g. in the panel, which are
always present due to the construction.
Typical tolerance compensation examples are:
● Tolerance compensation of the door angle with right-hinged or left-hinged doors
● Tilting of devices under their own weight when they are fastened to thin mounting plates
①
Molded case circuit breaker
②
Motor operator
③
Cover frame
④
Panel door (closed)
⑤
Panel door (open)
⑥
Tolerance compensation
Note
To ensure that the panel door can still be opened, a mounted accessory component must
not project beyond the cover frame by more than 5 mm / 0.19" when the door is closed.
Accessories
4.13 Escutcheon
3VA molded case circuit breakers with IEC certificate
530 Manual, 03/2019, A5E03603177010-03
4.13.2
Labeling plate
A supplementary labeling plate (3VA9087-0SX10) is available for the cover frame.
It can be latched in position in the center of any of the four sides of the cover frame. Paper or
plastic labels displaying plant-specific information are attached by adhesive to the labeling
plate.
The scope of supply includes ten labeling plates and ten aluminum-colored labels.
Accessories
4.14 DIN rail adapter
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 531
4.14
DIN rail adapter
4.14.1
Introduction
Description of application and basic function
The DIN rail adapter is used to mount molded case circuit breakers on 35 mm DIN rails of
meter or distribution cubicles, for example. DIN rail adapters are available exclusively for
3VA1 molded case circuit breakers in sizes 100 A and 160 A since, on the one hand, DIN
rails are not designed to support heavy weights and, on the other, only molded case circuit
breakers with thermal-magnetic trip units and rated operational currents up to maximum 160
A are normally installed in distribution boards.
The DIN rail adapters are snapped onto the rear panel of the molded case circuit breaker or
fastened by screws. With an adapter installed, the circuit breaker is simple to attach to a DIN
rail. This is done by placing the circuit breaker with attached DIN rail adapter from above
onto the DIN rail and then pressing the bottom half of the circuit breaker lightly against the
rail until the adapter engages.
Overview of variants and products
Accessories
4.14 DIN rail adapter
3VA molded case circuit breakers with IEC certificate
532 Manual, 03/2019, A5E03603177010-03
4.14.2
Information about installation, assembly and attachment
3VA1 160 1-pole and 2-pole molded case circuit breakers
3VA1 160 1-pole molded case circuit breakers
To attach these to a DIN rail, a 3VA9181-0SH10 DIN rail adapter is required. This DIN rail
adapter is not attached by screws to the molded case circuit breaker, but simply snapped
into place on the rear panel.
3VA1 160 2-pole molded case circuit breakers
To attach 2-pole molded case circuit breakers to 35 mm DIN rails, a 3VA9182-0SH10 DIN
rail adapter is required. This adapter is fitted with threaded nuts. The molded case circuit
breakers are screwed onto the adapter by means of the mounting screws supplied with the
circuit breakers. The nuts supplied with the circuit breakers are not required.
3VA1 100 and 3VA1 160 3-pole and 4-pole molded case circuit breakers
To attach 3-pole and 4-pole molded case circuit breakers to 35 mm DIN rails, a 3VA9187-
0SH10 DIN rail adapter is required. This adapter is fitted with threaded nuts. The molded
case circuit breakers are screwed onto the adapter by means of the mounting screws
supplied with the circuit breakers. The nuts supplied with the circuit breakers are not
required.
3VA1 100 and 3VA1 160 3-pole and 4-pole molded case circuit breakers with side mounted residual
current device
The 3VA9187-0SH20 DIN rail adapter has been specially developed for use with molded
case circuit breakers combined with side mounted residual current device. This DIN rail
adapter is also fitted with threaded nuts so that the molded case circuit breaker/residual
current device assembly can be fastened to it by means of the screws included in the scope
of supply of both devices.
Assembly instructions
The molded case circuit breaker must first be attached to the DIN rail adapter. 3-pole molded
case circuit breakers must be attached such that their right-hand edge (when viewed from
above) is flush with the DIN rail adapter. With 4-pole molded case circuit breakers, the N
pole is situated opposite on the left-hand side (when viewed from above). The screws are
inserted in the fastening holes between phases 1 and 2, and between phases 2 and 3, in the
molded case circuit breaker.
After the molded case circuit breaker has been attached to the DIN rail adapter, the residual
current device must also be mounted on the adapter. After the residual current device has
been secured in position on the DIN rail adapter, the main current paths of the residual
current device and the molded case circuit breaker must be checked to ensure that they are
properly aligned and connected.
Accessories
4.14 DIN rail adapter
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 533
Information about combination with other accessories
DIN rail adapters are normally used to install molded case circuit breakers (possibly with side
mounted residual current device) in distribution boards. The standard cover is then fitted
over the circuit breakers. The front panel (45 mm high) is the only part of the device which
protrudes through the cover. With this arrangement, it is not possible to use front mounted
accessories.
When molded case circuit breakers including DIN rail adapter are installed on rails in an
open system panel without a cover, it is possible to use front mounted accessories such as
motor operator, rotary operator with shaft stub, front mounted rotary operator and the front
mounted Bowden cable interlock module.
The following accessories are compatible with molded case circuit breakers and DIN rail
adapters:
Accessories
4.14 DIN rail adapter
3VA molded case circuit breakers with IEC certificate
534 Manual, 03/2019, A5E03603177010-03
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 535
Service and maintenance
5
5.1
Notes
Qualified personnel
It is essential to refer to this documentation when setting up and operating a device/system
described here. The device/system must only ever be serviced and maintained by qualified
personnel. For the purpose of the safety information in these operating instructions, a
"qualified person" is someone who is authorized to energize, ground, and tag equipment,
systems, and circuits in accordance with established safety procedures.
Maintenance category
5.2
Regular maintenance
Recommended maintenance/inspection intervals
Following initial commissioning, the equipment/system must be inspected at least once per
year.
In addition, an inspection should be carried out after 1000 trips at rated operational current.
If the molded case circuit breaker or switch disconnector is operated in an atmosphere that is
dust-laden or in which corrosive vapors, gases, or salt spray is present, it is advisable to
adjust the inspection intervals accordingly, e.g. to twice per year.
Service and maintenance
5.2 Regular maintenance
3VA molded case circuit breakers with IEC certificate
536 Manual, 03/2019, A5E03603177010-03
Inspection procedure recommended for 3VA molded case circuit breakers / switch disconnectors
Optional inspection procedure for the ETU of the 3VA2 molded case circuit breaker
Service and maintenance
5.3 Maintenance following tripping of a molded case circuit breaker
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 537
5.3
Maintenance following tripping of a molded case circuit breaker
If a 3VA molded case circuit breaker trips on overcurrent (overload, short circuit) or residual
current (ground fault or via residual current device), the cause of the trip must be identified
and rectified before the molded case circuit breaker is switched on again.
In the case of 3VA1 molded case circuit breakers with thermal-magnetic trip units, the cause
of tripping can be determined by means of the SAS short circuit alarm switch. With 3VA2
molded case circuit breakers, the cause of tripping can be output via the EFB300 external
function box. With electronic trip units 5-series and 8-series ETUs, the cause of tripping can
be indicated on the LCD and optionally transferred via communication modules.
An inspection as described in chapter Regular maintenance (Page 535) should be carried
out every time the molded case circuit breaker is tripped by the trip unit. In addition, all black
residues on the molded case circuit breaker must be removed as they might contain
conductive particles. The molded case circuit breaker should then be switched on and off
without load at least five times.
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 539
Technical specifications
6
6.1
Circuit diagrams
6.1.1
3VA1 molded case circuit breakers
6.1.1.1
Basic units
Switch disconnectors
①
Fixed mounting, 3-pole and 4-pole
②
Plug-in/draw-out units, 3-pole and 4-pole
Technical specifications
6.1 Circuit diagrams
3VA molded case circuit breakers with IEC certificate
540 Manual, 03/2019, A5E03603177010-03
3VA1 molded case circuit breakers with thermal-magnetic trip unit
Fixed mounting and plug-in/draw-out units, 3-pole and 4-pole
①
Fixed mounting, 3-pole and 4-pole
②
Plug-in/draw-out units, 3-pole and 4-pole
Technical specifications
6.1 Circuit diagrams
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 541
Fixed mounting and plug-in/draw-out units, 4-pole, unprotected N conductor
①
Fixed mounting, 4-pole, unprotected N conductor
②
Plug-in and draw-out units, 4-pole, unprotected N conductor
Technical specifications
6.1 Circuit diagrams
3VA molded case circuit breakers with IEC certificate
542 Manual, 03/2019, A5E03603177010-03
6.1.1.2
Accessories
Auxiliary switches, alarm switches and position signaling contacts
①
Changeover contacts for auxiliary switches AUX, trip alarm switches TAS and electrical alarm
switches EAS, position signaling switches for plug-in and draw-out units
②
Leading changeover contacts for leading changeover switch LCS
Auxiliary releases
①
Undervoltage release UVR
②
Universal release UNI
③
Shunt trip
Technical specifications
6.1 Circuit diagrams
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 543
Motor operators
MO310 side mounted motor operator and MO320 front mounted motor operator
MO310 / MO320 motor operator actuation controlled via control cable
S0 OFF (to be provided by customer)
S1 ON (to be provided by customer)
F1 Fuse in the control circuit (to be provided by customer)
L1 Indicator light AUTO mode (to be provided by customer)
L2 Indicator light MAN mode (to be provided by customer)
Technical specifications
6.1 Circuit diagrams
3VA molded case circuit breakers with IEC certificate
544 Manual, 03/2019, A5E03603177010-03
MO310 / MO320 motor operator actuation controlled via control cable and undervoltage
release
S0 OFF (to be provided by customer)
S1 ON (to be provided by customer)
S01 Remote command (to be provided by customer)
K1 Contactor relay (to be provided by customer)
U< Undervoltage release (to be provided by customer)
F1 Fuse in the control circuit (to be provided by customer)
L1 Indicator light AUTO mode (to be provided by customer)
L2 Indicator light MAN mode (to be provided by customer)
This circuit is deployed in order to prevent no-load operation of the molded case circuit
breaker. The contact of auxiliary contactor K1 prevents no-load operation when the
undervoltage release "U<" is de-energized.
No-load operations subject the molded case circuit breaker to high stresses. If the
undervoltage release is de-energized, auxiliary contactor K1 has not picked up. The contact
in the ON circuit (control circuit) of the motor operator is thus not closed, i.e. the molded case
circuit breaker cannot be switched.
This auxiliary contactor is not necessary when the undervoltage release is supplied
uninterrupted (e.g. pushbutton S01) from the same source as the motor operator itself (e.g.
contact 3).
Technical specifications
6.1 Circuit diagrams
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 545
Plug-in and draw-out units
①
Plug-in units, 3-pole and 4-pole, with two optionally integrated position signaling switches for
signaling "Plug-in unit - MCCB correctly bolted to plug-in socket".
②
Draw-out units, 3-pole and 4-pole, with an optional switch for signaling the condition "Draw-out
unit locked / open" and six optionally integrated position signaling switches for signaling "Posi-
tion of breaker in the draw-out unit".
Technical specifications
6.1 Circuit diagrams
3VA molded case circuit breakers with IEC certificate
546 Manual, 03/2019, A5E03603177010-03
RCD Basic
Type A
①
Side mounted RCD Basic, 3-pole and 4-pole
②
Loadside RCD Basic, 3-pole and 4-pole
Type B
Loadside Basic residual current device, 3-pole (in 4-pole enclosure) and 4-pole
Technical specifications
6.1 Circuit diagrams
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 547
6.1.1.3
Example: 3VA1 molded case circuit breaker with built-on/built-in accessories
Technical specifications
6.1 Circuit diagrams
3VA molded case circuit breakers with IEC certificate
548 Manual, 03/2019, A5E03603177010-03
6.1.2
3VA2 molded case circuit breakers
6.1.2.1
Basic units
Fixed mounting and plug-in/draw-out units, 3-pole and 4-pole
①
Fixed mounting, 3-pole and 4-pole
②
Plug-in/draw-out units, 3-pole and 4-pole
* Voltage tap
Technical specifications
6.1 Circuit diagrams
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 549
Fixed mounting, 3-pole 3VA2 molded case circuit breaker in 5-wire system
①
Optional external current transformer for N conductor (gray line)
* Voltage tap
Technical specifications
6.1 Circuit diagrams
3VA molded case circuit breakers with IEC certificate
550 Manual, 03/2019, A5E03603177010-03
6.1.2.2
Accessories
Auxiliary switches, alarm switches and position signaling contacts
①
Changeover contacts for auxiliary switches AUX, trip alarm switches TAS and electrical alarm
switches EAS, position signaling switches for plug-in and draw-out units
②
Leading changeover contacts for leading changeover switch LCS
Auxiliary releases
①
Undervoltage release UVR
②
Universal release UNI
③
Shunt trip
Technical specifications
6.1 Circuit diagrams
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 551
Other internal accessories
①
COM060 communication module
②
24 V module
Motor operators
MO320 front mounted motor operator
Technical specifications
6.1 Circuit diagrams
3VA molded case circuit breakers with IEC certificate
552 Manual, 03/2019, A5E03603177010-03
MO320 motor operator actuation controlled via control cable
S0 OFF (to be provided by customer)
S1 ON (to be provided by customer)
F1 Fuse in the control circuit (to be provided by customer)
L1 Indicator light AUTO mode (to be provided by customer)
L2 Indicator light MAN mode (to be provided by customer)
Technical specifications
6.1 Circuit diagrams
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 553
MO320 motor operator actuation controlled via control cable and undervoltage release
S0 OFF (to be provided by customer)
S1 ON (to be provided by customer)
S01 Remote command (to be provided by customer)
K1 Contactor relay (to be provided by customer)
U< Undervoltage release (to be provided by customer)
F1 Fuse in the control circuit (to be provided by customer)
L1 Indicator light AUTO mode (to be provided by customer)
L2 Indicator light MAN mode (to be provided by customer)
This circuit is deployed in order to prevent no-load operation of the molded case circuit
breaker. The contact of auxiliary contactor K1 prevents no-load operation when the
undervoltage release "U<" is de-energized.
No-load operations subject the molded case circuit breaker to high stresses. If the
undervoltage release is de-energized, auxiliary contactor K1 has not picked up. The contact
in the ON circuit (control circuit) of the motor operator is thus not closed, i.e. the molded case
circuit breaker cannot be switched.
This auxiliary contactor is not necessary when the undervoltage release is supplied
uninterrupted (e.g. pushbutton S01) from the same source as the motor operator itself (e.g.
contact 3).
Technical specifications
6.1 Circuit diagrams
3VA molded case circuit breakers with IEC certificate
554 Manual, 03/2019, A5E03603177010-03
SEO520 motor operator with stored energy operator
Technical specifications
6.1 Circuit diagrams
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 555
Actuation of SEO520 motor operator with stored energy operator controlled via control cable
S1 OFF (to be provided by customer)
S2
ON (to be provided by customer)
S3 Reset signal for operating mode 3 (to be provided by customer)
F1 Fuse in the control circuit (to be provided by customer)
L1
Indicator light AUTO mode (to be provided by customer)
L2 Indicator light MAN mode (to be provided by customer)
Technical specifications
6.1 Circuit diagrams
3VA molded case circuit breakers with IEC certificate
556 Manual, 03/2019, A5E03603177010-03
Actuation of SEO520 motor operator with stored energy operator controlled via control cable
and undervoltage release
S1 OFF (to be provided by customer)
S2
ON (to be provided by customer)
S3 Reset signal for operating mode 3 (to be provided by customer)
S01 Remote command (to be provided by customer)
K1
Contactor relay (to be provided by customer)
U< Undervoltage release (to be provided by customer)
F1 Fuse in the control circuit (to be provided by customer)
L1
Indicator light AUTO mode (to be provided by customer)
L2 Indicator light MAN mode (to be provided by customer)
Technical specifications
6.1 Circuit diagrams
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 557
Plug-in and draw-out units
Plug-in and draw-out units
①
Plug-in units, 3-pole and 4-pole, with two optionally integrated position signaling switches for signaling "Plug-in unit
- MCCB correctly bolted to plug-in socket".
②
Draw-out units, 3-pole and 4-pole, with an optional switch for signaling the condition "Draw-out unit locked / open"
and six optionally integrated position signaling switches for signaling "Position of breaker in the draw-out unit".
*
Voltage tap
Technical specifications
6.1 Circuit diagrams
3VA molded case circuit breakers with IEC certificate
558 Manual, 03/2019, A5E03603177010-03
Draw-out units with communication interface
* Voltage tap
Draw-out units, 3-pole and 4-pole, with an optional switch for signaling the condition "Draw-
out unit locked / open" and three optionally integrated position signaling switches for
signaling "Position of breaker in the draw-out unit".
Technical specifications
6.1 Circuit diagrams
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 559
RCD Advanced
Loadside RCD, 3-pole and 4-pole
type A
* Voltage tap
Technical specifications
6.1 Circuit diagrams
3VA molded case circuit breakers with IEC certificate
560 Manual, 03/2019, A5E03603177010-03
Other external accessories
T-connector
* A connection can also be optionally equipped with a bus terminating resistor.
The T-Connector is included in the scope of supply of the COM060 communication module.
COM800 / COM100 breaker data server
* A connection can also be optionally equipped with a bus terminating resistor.
Technical specifications
6.1 Circuit diagrams
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 561
COM800 / COM100 breaker data server with expansion modules
①
COM800 / COM100 breaker data server with 7KM PAC PROFIBUS DP expansion module
②
COM800 / COM100 breaker data server with 7KM PAC Switched Ethernet PROFINET expansion module
③
COM800 / COM100 breaker data server with 7KM PAC RS485 Modbus RTU expansion module
* A connection can also be optionally equipped with a bus terminating resistor.
EFB300 external function box
Technical specifications
6.1 Circuit diagrams
3VA molded case circuit breakers with IEC certificate
562 Manual, 03/2019, A5E03603177010-03
External current transformer for N conductor and illumination kit (24 V DC) for manual
handle
①
Connection for external current transformer for N conductor
②
Illumination kit (24 V DC) for manual handle
* Voltage tap
Time-delay device for undervoltage releases
Technical specifications
6.1 Circuit diagrams
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 563
6.1.2.3
Example: 3VA2 molded case circuit breaker with built-on/built-in accessories
* A connection can also be optionally equipped with a bus terminating resistor.
Technical specifications
6.1 Circuit diagrams
3VA molded case circuit breakers with IEC certificate
564 Manual, 03/2019, A5E03603177010-03
6.1.3
Application example
Electrical interlocking of two 3VA molded case circuit breakers with undervoltage releases
Q 1 Molded case circuit breaker 1
UVR1 Undervoltage release in molded case circuit breaker 1
AUX1 Auxiliary switch in molded case circuit breaker 1
Q2 Molded case circuit breaker 2
UVR2 Undervoltage release in molded case circuit breaker 2
AUX2 Auxiliary switch in molded case circuit breaker 2
Note
The undervoltage release UVR must not be connected to phases L1 and L3 for 690 V AC
applications. In this case, it is connected to phase L1 and the N conductor or to a control
voltage supply up to maximum 480 V AC.
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 565
6.2
Dimensional drawings
6.2.1
Dimensions of basic units
6.2.1.1
3VA10 and 3VA11
3VA11 160 A 1-pole / 2-pole
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
566 Manual, 03/2019, A5E03603177010-03
3VA10 100 A / 3VA11 160 A 3-pole / 4-pole
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 567
6.2.1.2
3VA12
3VA12 250 A 3-pole / 4-pole
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
568 Manual, 03/2019, A5E03603177010-03
6.2.1.3
3VA13 / 3VA14
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 569
6.2.1.4
3VA20 / 3VA21 / 3VA22
3VA20 100 A / 3VA21 160 A / 3VA22 250 A 3-pole / 4-pole
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
570 Manual, 03/2019, A5E03603177010-03
6.2.1.5
3VA23 / 3VA24
3VA23 400 A / 3VA24 630 A 3-pole / 4-pole
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 571
6.2.1.6
3VA25
3VA25 1000 A 3-pole / 4-pole
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
572 Manual, 03/2019, A5E03603177010-03
6.2.2
Dimensions of accessories
6.2.2.1
Connection technology
Bus connectors extended or offset for 3VA up to 630 A
Extension
Rotated extension
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 573
Offset
Right-angled extension
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
574 Manual, 03/2019, A5E03603177010-03
Bus connectors extended or offset for 3VA up to 1000 A
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 575
Wire connectors large / for 2 cables / for 6 cables up to 630 A
The dimensions of the terminal cover for wire connectors large / for 2 cables / for 6 cables up
to 630 A are shown below.
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
576 Manual, 03/2019, A5E03603177010-03
Rear connection stud flat
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 577
Rear connection stud round
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
578 Manual, 03/2019, A5E03603177010-03
Phase barrier
Phase barrier for 3VA up to 630 A
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 579
Phase barrier for 3VA up to 1000 A
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
580 Manual, 03/2019, A5E03603177010-03
Terminal cover extended
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 581
Terminal cover offset
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
582 Manual, 03/2019, A5E03603177010-03
Insulating plate
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 583
Insulating plate offset:
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
584 Manual, 03/2019, A5E03603177010-03
6.2.2.2
Plug-in and draw-out units
Plug-in socket
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 585
Draw-out unit
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
586 Manual, 03/2019, A5E03603177010-03
Door feedthrough
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 587
6.2.2.3
Manual operators
Front mounted rotary operator
Front mounted rotary operator for 3VA up to 630 A
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
588 Manual, 03/2019, A5E03603177010-03
Front mounted rotary operator for 3VA up to 1000 A
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 589
Door mounted rotary operator
Door mounted rotary operator for 3VA up to 630 A (3VA9..7 - 0FK2.)
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
590 Manual, 03/2019, A5E03603177010-03
Door mounted rotary operator for 3VA up to 630 A (3VA9..7 - 0FK61)
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 591
Door mounted rotary operator with variable depth adapter (3VA9487-0GB10, 3VA9..7 -
0FK2.)
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
592 Manual, 03/2019, A5E03603177010-03
Door mounted rotary operator with variable depth adapter (3VA9..7 - 0FK61)
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 593
Door mounted rotary operator for 3VA up to 1000 A
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
594 Manual, 03/2019, A5E03603177010-03
Supplementary handle for door mounted rotary operator
Supplementary handle for door mounted rotary operator 3VA9.87 - 0GC..
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 595
Supplementary handle for door mounted rotary operator 3VA9.87 - 0GA80
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
596 Manual, 03/2019, A5E03603177010-03
Side wall mounted rotary operator
Side wall mounted rotary operator
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 597
Side wall mounted rotary operator with mounting plate
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
598 Manual, 03/2019, A5E03603177010-03
Rotary operator with shaft stub
Rotary operator with shaft stub for 3VA up to 630 A
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 599
Rotary operator with shaft stub for 3VA up to 1000 A
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
600 Manual, 03/2019, A5E03603177010-03
6.2.2.4
Motor operators
MO310 motor operator
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 601
MO320 motor operator
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
602 Manual, 03/2019, A5E03603177010-03
SEO520 motor operator with stored energy operator
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 603
6.2.2.5
Accessories for locking, blocking and interlocking
Padlock device for handle
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
604 Manual, 03/2019, A5E03603177010-03
Locking, blocking or interlocking with cylinder lock
Cable interlock module using a Bowden cable
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 605
Handle blocking device
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
606 Manual, 03/2019, A5E03603177010-03
Rear interlock: Mounting on rear wall of panel, fixed-mounted
3VA up to 630 A
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 607
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
608 Manual, 03/2019, A5E03603177010-03
Rear interlock: Mounting with mounting plate and profile rail
3VA up to 630 A
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 609
3VA up to 1000 A
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
610 Manual, 03/2019, A5E03603177010-03
Rear interlock: Mounting on rear wall of panel, plug-in technology
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 611
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
612 Manual, 03/2019, A5E03603177010-03
Rear interlock: Mounting on rear wall of panel, draw-out technology
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 613
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
614 Manual, 03/2019, A5E03603177010-03
6.2.2.6
Residual current devices
Side-mounted residual current devices Basic RCD310 and Basic RCD510
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 615
Loadside residual current devices Basic RCD320 and Basic RCD520
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
616 Manual, 03/2019, A5E03603177010-03
Loadside residual current device Basic RCD520B
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 617
Loadside residual current device Advanced RCD820
With 3VA2 molded case circuit breaker sizes 100 A to 250 A
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
618 Manual, 03/2019, A5E03603177010-03
With 3VA2 molded case circuit breaker sizes 400 A to 630 A
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 619
6.2.2.7
Communication and system integration
COM800 and COM100 breaker data server
DSP800 display
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
620 Manual, 03/2019, A5E03603177010-03
6.2.2.8
EFB300 external function box
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 621
6.2.2.9
Test devices
TD300 activation and trip box
You can find more information in chapter Technical specifications of TD300 (Page 512).
TD500 test device
You can find more information in chapter Technical specifications of TD500 (Page 524).
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
622 Manual, 03/2019, A5E03603177010-03
6.2.2.10
External current transformer for N conductor
Dimensions of external current transformer for front busbar connector up to 630 A
Dimensions of external current transformer as straight-through transformer up to 1250 A
Dimensions 25 ... 630 A
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 623
Dimensions 600 A … 1250 A
Technical specifications
6.2 Dimensional drawings
3VA molded case circuit breakers with IEC certificate
624 Manual, 03/2019, A5E03603177010-03
6.2.2.11
Escutcheon
Technical specifications
6.3 Power losses
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 625
6.3
Power losses
6.3.1
Power losses of 3VA1 molded case circuit breakers
1) The following values for additional power losses result based on the derating factor of 0.9 (< 500 A) or 0.8 (≥ 500 A)
for plug-in and draw-out units
320 A: 24.5 W
400 A: 29.4 W
500 A: 31.7 W
630 A: 50.0 W
Technical specifications
6.3 Power losses
3VA molded case circuit breakers with IEC certificate
626 Manual, 03/2019, A5E03603177010-03
Note
The specified power loss applies to 3-pole and 4-pole devices in the case of 3-phase,
symmetrical loading.
Power losses of 3VA1 molded case circuit breakers - starter protection circuit breakers
Power losses of 3VA1 molded case circuit breakers - switch disconnectors
Technical specifications
6.4 Derating and temperature compensation
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 627
6.3.2
Power losses of 3VA2 molded case circuit breakers
Note
The specified power loss applies to 3-pole and 4-pole devices in the case of 3-phase,
symmetrical loading.
Technical specifications
6.4 Derating and temperature compensation
3VA molded case circuit breakers with IEC certificate
628 Manual, 03/2019, A5E03603177010-03
6.4
Derating and temperature compensation
6.4.1
Derating of 3VA1 molded case circuit breakers
The temperature inside the molded case circuit breaker is influenced by the ambient
temperature and the current-dependent power loss generated inside the unit. To prevent
overloading of 3VA1 molded case circuit breakers under difficult thermal conditions, the
maximum rated continuous operational current must be limited as a function of the ambient
temperature.
Note
The values were calculated for molded case circuit breakers without accessories. They do
not apply to all installation situations of the molded case circuit breaker and may deviate
depending upon factors such as cables and busbars, packing density, ventilation, etc.
Please observe the applicable overriding guidelines (e.g. IEC 61439).
1) For TM120M only (starter protection circuit breaker)
No derating up to the rated operational current In of the molded case circuit breaker
Technical specifications
6.4 Derating and temperature compensation
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 629
Derating in combination with accessories
None of the accessories from the extensive range available for 3VA1 molded case circuit
breakers has an influence on the thermal response thresholds of the switching devices
except for two accessories that require additional correction factors. These are:
1) For TM120M only (starter protection circuit breaker)
No derating up to the rated operational current In of the molded case circuit breaker
Technical specifications
6.4 Derating and temperature compensation
3VA molded case circuit breakers with IEC certificate
630 Manual, 03/2019, A5E03603177010-03
No derating up to the rated operational current In of the molded case circuit breaker
No derating up to the rated operational current In of the molded case circuit breaker
Technical specifications
6.4 Derating and temperature compensation
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 631
No derating up to the rated operational current In of the molded case circuit breaker
Technical specifications
6.4 Derating and temperature compensation
3VA molded case circuit breakers with IEC certificate
632 Manual, 03/2019, A5E03603177010-03
6.4.2
Temperature compensation for thermal-magnetic trip units TM210, TM220 and
TM240
The trip units for 3VA1 molded case circuit breakers are factory-calibrated to a temperature
of 50 °C. The thermal response threshold of the trip unit changes when the circuit breaker is
operated in a higher or lower ambient temperature. To obtain the characteristic tripping times
at a specific ambient temperature, it is necessary to apply correction factors when setting the
thermal trip units.
Correction factor TK is applied to compensate for the ambient temperature.
The first step in calculating the correction factor TK is to determine the setting factor at 50 °C:
EF(50 °C) Setting factor at 50 °C
I System current
In Rated operational current of the molded case circuit breaker
Using the setting factor calculated at 50 °C, it is possible to read the correction factor K off
the following charts:
No derating up to the rated operational current In of the molded case circuit breaker
Technical specifications
6.4 Derating and temperature compensation
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 633
Using the two calculated values, it is possible to determine the temperature compensation
TK and finally the setting value for the trip unit Ir(TU):
TK(TU) Temperature compensation for molded case circuit breaker with service tempera-
ture TU
K Correction factor
Tu Service temperature of molded case circuit breaker
Trip unit setting value:
Ir(TU) = In · EF(50 °C) · TK
Ir(TU) Trip unit setting value with service temperature Tu
The operational current must never exceed the maximum rated operational current In of the
molded case circuit breaker. If the current calculated for the operating conditions is higher
than the rated operational current of the unit, a molded case circuit breaker with the
appropriate rated operational current must be deployed.
Technical specifications
6.4 Derating and temperature compensation
3VA molded case circuit breakers with IEC certificate
634 Manual, 03/2019, A5E03603177010-03
Example 1: Correction of setting values as a function of ambient temperature
Starting point:
On a 3VA1 100 A molded case circuit breaker with a TM240 100 A trip unit, the real tripping
threshold for various different service temperatures must be set to a required system current
of I = 90 A.
●
Ambient temperature 60 °C:
Setting factor EF(50 °C) = (90 / 100) = 0.9
Correction factor K = 0.58 (see chart above)
Temperature compensation TK(60 °C) = (0.58 · (60 °C to 50 °C) / 100) + 1 = 1.058
Setting value Ir(60 °C) = 100 A · 0.9 · 1.058 =
95 A
●
Ambient temperature 40 °C:
Setting factor EF(50 °C) = (90 / 100) = 0.9
Correction factor K = 0.58
Temperature compensation TK(40 °C) = (0.58 · (40 °C ... 50 °C) / 100) + 1 = 0.942
Setting value Ir(40 °C) = 100 A · 0.9 · 0.942 =
85 A
If the setting value calculated for the thermal trip unit Ir(TU) is outside the possible setting
range, an appropriate molded case circuit breaker with a higher or lower rated operational
current must be selected and the compensation calculation then performed again.
Note
These values do not apply to all installation situations of the molded case circuit breaker and
may deviate depending upon factors such as cables and busbars, packing density,
ventilation, etc.
Please observe the applicable overriding guidelines (e.g. IEC 61439).
Example 2: Calculation of the tripping time
Starting point:
Based on the example above, the tripping time for an overcurrent IO = 360 A will now be
calculated.
To compensate for the ambient temperature of 60 °C, rather than 50 °C, the thermal trip unit
has been set Ir(60 °C) = 95 A for a system current I = 90 A.
The first step is to calculate the ratio between the overcurrent and the system current:
Io/I = 360 A / 90 A = 4
Technical specifications
6.4 Derating and temperature compensation
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 635
Using this value, it is now possible to read the tripping time from the characteristics chart:
①
Tripping time (schematic representation)
Inclusion of accessories
None of the accessories from the extensive range available for 3VA1 molded case circuit
breakers has an influence on the thermal response thresholds of the switching devices
except for two accessories that require additional correction factors. These are:
● Plug-in version / draw-out version
● Residual current devices
None of the other accessories has an influence on the thermal response thresholds of trip
units.
Technical specifications
6.4 Derating and temperature compensation
3VA molded case circuit breakers with IEC certificate
636 Manual, 03/2019, A5E03603177010-03
The table below shows the correction factors of setting value Ir for the trip units of 3VA1
molded case circuit breakers in plug-in / draw-out technology and for 3VA1 molded case
circuit breakers combined with residual current devices:
Example
Starting point:
The current loading of a 3VA1 molded case circuit breaker is calculated to be 90 A and the
ambient temperature 65 °C for a given application. The plug-in version of the molded case
circuit breaker will be used.
The appropriate size of molded case circuit breaker is determined first on the basis of the
correction factor for 3VA1 plug-in technology (see table above):
Design of assembly at 50 °C: Ir = (90 A / 0.9) = 100 A
It is therefore necessary to select a molded case circuit breaker that allows a setting value of
100 A on the thermal overload release at a calibration temperature of 50 °C. A 3VA1 molded
case circuit breaker 160 A with In = 125 A is therefore used for the application.
The temperature compensation is then calculated according to the method described above:
●
Ambient temperature 65 °C:
Setting factor EF(50 °C) = (100 / 125) = 0.8
Correction factor K = 0.69 (from chart)
Switching device temperature compensation TK(65 °C) = (0.69 · (65 °C ... 50 °C) /
100) + 1 = 1.1
Setting value Ir(65 °C) = 125 A · 0.9 · 1.1 =
124 A
Note
These values do not apply to all installation situations of the molded case circuit breaker and
may deviate depending upon factors such as cables and busbars, packing density,
ventilation, etc.
Please observe the applicable overriding guidelines (e.g. IEC 61439).
Technical specifications
6.4 Derating and temperature compensation
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 637
6.4.3
Additional correction factors with frequencies other than 50/60 Hz for 3VA1
molded case circuit breakers
The temperature rise in the bimetal is greater at frequencies above 50/60 Hz. This is due to
eddy-current losses and the reduction in the available conductor cross section as a result of
the skin effect.
The rated operational current must therefore be reduced from the value used in 50/60 Hz
applications.
In an application with 400 Hz, this means the following for the example from chapter
Derating of 3VA1 molded case circuit breakers (Page 628) with a 3VA1 molded case circuit
breaker when current Ir = 90 A is required:
● Setting value Ir(400 Hz) = 90 A · 0.9 = 81 A
Where ambient temperatures differ from the calibration temperature, temperature
compensation as described in chapter Derating of 3VA1 molded case circuit breakers
(Page 628) must be performed.
In addition, a correction factor for setting the magnetic trip unit as a function of frequency
must be applied.
Technical specifications
6.4 Derating and temperature compensation
3VA molded case circuit breakers with IEC certificate
638 Manual, 03/2019, A5E03603177010-03
Example
Starting point:
A 3VA1 molded case circuit breaker 100 A with a TM240 trip unit is used for a 400 Hz
application. The molded case circuit breaker is required to trip instantaneously in response to
an overcurrent of 900 A.
The maximum permissible rated continuous operational current is calculated first:
100 A · 0.9 =
90 A
The setting value for instantaneous short-circuit protection (Ii) is then determined on the
basis of the correction factor from the table above:
Ii = 900 A · 0.7 =
630 A
6.4.4
Correction factors with direct current for the thermal-magnetic trip units of 3VA1
molded case circuit breakers
With DC systems, a correction factor must be applied to the magnetic trip unit.
Where ambient temperatures differ from the calibration temperature, temperature
compensation as described in chapter Derating of 3VA1 molded case circuit breakers
(Page 628) must be performed.
Example:
Starting point:
A 3VA1 molded case circuit breaker 160 A with a TM240 trip unit is used in a DC system.
The molded case circuit breaker is required to trip instantaneously in response to an
overcurrent of 1200 A.
The setting value for the instantaneous short-circuit protection (Ii) is:
Ii = 1200 A · 0.7 =
840 A
Technical specifications
6.4 Derating and temperature compensation
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 639
6.4.5
Derating for the 3VA1 switch disconnector
The 3VA1 SD switch disconnectors do not have a trip unit. The temperature inside the switch
disconnector is however influenced by the ambient temperature and the current-dependent
power loss generated inside the unit. Nonetheless, 3VA1 switch disconnectors up to 125 A
do not require derating up to 70 °C.
To prevent overloading of switch disconnectors over 125 A under difficult thermal conditions,
the maximum rated continuous operational current must be limited as a function of the
ambient temperature:
No derating up to the rated operational current In of the switch disconnector
Technical specifications
6.4 Derating and temperature compensation
3VA molded case circuit breakers with IEC certificate
640 Manual, 03/2019, A5E03603177010-03
Limitation of the rated continuous operational current in combination with accessories
The table below shows the maximum rated continuous operational current for the plug-in
version of switch disconnectors in sizes 160 A, 250 A and 400 A and for switch
disconnectors combined with residual current devices:
No derating up to the rated operational current In of the molded case circuit breaker
No derating up to the rated operational current In of the molded case circuit breaker
None of the other available accessories require derating of the 3VA1 switch disconnector.
Technical specifications
6.4 Derating and temperature compensation
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 641
6.4.6
Derating for the electronic trip units of 3VA2 molded case circuit breakers
The current measuring circuits of the electronic trip units of 3VA2 molded case circuit
breakers are not affected by the ambient temperature. The Rogowski coils integrated in the
trip unit measure the current and compare it to the set tripping threshold. Higher or lower
ambient temperatures do not influence the tripping threshold, which means that it is not
necessary to apply correction factors.
Limitation of the rated operational current
The temperature inside the molded case circuit breaker is nonetheless influenced by the
ambient temperature and the current-dependent power loss generated inside the unit. To
prevent overloading of molded case circuit breakers under difficult thermal conditions, the
maximum rated continuous operational current must therefore be limited as a function of the
ambient temperature in some cases:
The tables below specify the maximum rated uninterrupted operational current as a function
of the accessories to be taken into account and the ambient temperature. The operational
current must never exceed the maximum rated operational current of the molded case circuit
breaker.
Note
These values do not apply to all installation situations of the molded case circuit breaker and
may deviate depending upon factors such as cables and busbars, packing density,
ventilation, etc.
Please observe the applicable overriding guidelines (e.g. IEC 61439).
Technical specifications
6.4 Derating and temperature compensation
3VA molded case circuit breakers with IEC certificate
642 Manual, 03/2019, A5E03603177010-03
3VA2 molded case circuit breakers, fixed-mounted versions
1) Only the COM060 communication module has an effect on derating. Other internal accessories can be used
without restriction.
COM060 COM060 communication module
No derating up to the rated operational current In of the molded case circuit breaker
Technical specifications
6.4 Derating and temperature compensation
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 643
3VA2 molded case circuit breakers, plug-in and draw-out versions
1) Only the COM060 communication module has an effect on derating. Other internal accessories can be used
without restriction.
COM060 COM060 communication module
No derating up to the rated operational current In of the molded case circuit breaker
Technical specifications
6.4 Derating and temperature compensation
3VA molded case circuit breakers with IEC certificate
644 Manual, 03/2019, A5E03603177010-03
3VA2 molded case circuit breakers with RCD820 residual current device
1) Only the COM060 communication module has an effect on derating. Other internal accessories can be used
without restriction.
COM060 COM060 communication module
No derating up to the rated operational current In of the molded case circuit breaker
Technical specifications
6.4 Derating and temperature compensation
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 645
Examples
Example 1
Starting point:
A plug-in version of a 3VA2 molded case circuit breaker 160 A with an ETU350 LSI trip unit
is to be operated at 70 °C:
Ir(max 70° C) =
160 A
No derating is required.
Example 2
Starting point:
A plug-in version of a 3VA2 molded case circuit breaker 250 A with an ETU850 LSI trip unit
is to be operated at 60 °C with the COM060 communication module:
Ir(max 60 °C) =
189 A
6.4.7
Use of terminals with auxiliary conductor connection
When connecting terminals with control wire tap are used, the total current from the main
circuit and control wire must not exceed the maximum rated operational current of the 3VA1
and 3VA2 molded case circuit breakers.
Technical specifications
6.4 Derating and temperature compensation
3VA molded case circuit breakers with IEC certificate
646 Manual, 03/2019, A5E03603177010-03
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 647
Appendix
A
A.1
Standards and approvals
Description
Table A- 1 3VA1 and 3VA2 molded case circuit breakers conform to the following international
standards
Standard
Title
CISPR11 Class A Limits and methods of measurement of radio interference suppression of
equipment in industrial environments.
Class B Limits and methods of measurement of radio interference suppression of
equipment in domestic environments.
IEC 60664-1 Insulation coordination for equipment within low-voltage systems.
IEC 60068-2-1 "Ab" Environmental testing - Part 2-1: Tests - Test A: Cold
IEC 60068-2-2 "Bd" Environmental testing - Part 2-2: Tests - Test B: Dry heat
IEC 60068-2-27 "Ea" Environmental testing - Part 2-27: Tests - Test Ea and guidance Shock
IEC 60068-2-30 "Db" Environmental testing - Part 2-30: Tests - Test Db: Damp heat, cyclic (12
+ 12 hours)
IEC 60068-2-52 Environmental testing - Part 2: Tests - Test Kb: Salt mist, cyclic (sodium
chloride solution)
IEC 60068-2-6 "Fc" Environmental testing - Part 2-6: Tests - Test Fc: Vibration (sinusoidal)
IEC 60228 Class 1 Solid conductors
IEC 60228 Class 2 Stranded conductors
IEC 60228 Class 5 Flexible conductors
IEC 60228 Class 6 Very flexible conductors (more flexibility than Class 5)
IEC 60364-4-41 Electrical installations of buildings - Part 4-41: Protection for safety - Pro-
tection against electric shock
VDE 0100-410
(IEC 60364-4-41)
Protection for safety - Protection against electric shock
IEC 60529 Degrees of protection provided by enclosures (IP code)
IEC 60947-1 /
DIN EN 60947-1
(VDE 0600-100)
Low-voltage switchgear and controlgear – General rules
IEC / EN 60947-1 Low-voltage switchgear and controlgear – General rules
IEC / EN 60947-1, An-
nex S
Digital inputs and/or digital outputs contained in switchgear and control-
gear
IEC / EN 60947-2 Edi-
tion 4.1, 05.2009
Low-voltage switchgear and controlgear - Part 2: Circuit-Breakers
IEC / EN 60947-2,
Annex B
Circuit-breakers incorporating residual current protection
Appendix
A.1 Standards and approvals
3VA molded case circuit breakers with IEC certificate
648 Manual, 03/2019, A5E03603177010-03
Standard
Title
IEC / EN 60947-2, An-
nex H
"Test sequence for circuit-breakers for IT systems"
"Circuit-breakers for IT systems"
IEC / EN 60947-3 /
DIN EN 60947-3
(VDE 0660-107)
Low-voltage switchgear and controlgear – Switches, disconnectors,
switch-disconnectors and fuse-combination units
IEC 60947-4-1 /
DIN EN 60947-4-1
(VDE 0660-102)
Contactors and motor-starters – Electromechanical contactors and motor-
starters
IEC / EN 61000-4-2 Electrostatic discharge immunity test
IEC / EN 61000-4-3 Radiated, radio-frequency, electromagnetic field immunity test
IEC / EN 61000-4-4 Electrical fast transient/burst immunity test
IEC / EN 61000-4-5 Surge immunity test
IEC / EN 61000-4-6 Immunity to conducted disturbances, induced by radio-frequency fields
IEC 61557-12 Electrical safety in low voltage distribution systems up to 1000 V a.c. and
1500 V d.c. - Equipment for testing, measuring or monitoring of protective
measures - Part 12: Performance measuring and monitoring devices
(PMD)
UL489 Annex SE "Firmware analysis for safety-relevant applications in electronic trip units"
RoHS Directive 2002/95/EC (Directive on the restriction of the use of
certain hazardous substances in electrical and electronic equipment)
3VA molded case circuit breakers conform to the following national standards
Please go to (http://www.siemens.com/3VA-Documentation) for a list of national standards to
which 3VA molded case circuit breakers conform.
Certification by marine classification societies
You can find a list of certifications by marine classification societies for 3VA molded case
circuit breakers at (http://www.siemens.com/3VA-Documentation).
Disposal of waste electronic equipment
Waste electronic equipment must not be disposed of as unsorted municipal waste, e.g.
household waste. When disposing of waste electronic equipment, the current local
national/international regulations must be observed.
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 649
ESD guidelines
B
B.1
Electrostatic sensitive devices (ESD)
ESD components are destroyed by voltage and energy far below the limits of human
perception. Voltages of this kind occur as soon as a device or an assembly is touched by a
person who is not electrostatically discharged. ESD components which have been subject to
such voltage are usually not recognized immediately as being defective, because the
malfunction does not occur until after a longer period of operation.
ESD Guidelines
NOTICE
Electrostatic sensitive devices
Electronic modules contain components that can be destroyed by electrostatic discharge.
These modules can be easily destroyed or damaged by improper handling.
• You must discharge your body electrostatically immediately before touching an
electronic component. To do this, touch a conductive, grounded object, e.g., a bare
metal part of a switch cabinet or the water pipe.
• Always hold the component by the plastic enclosure.
• Electronic modules should not be brought into contact with electrically insulating
materials such as plastic film, plastic parts, insulating table supports or clothing made of
synthetic fibers.
• Always place electrostatic sensitive devices on conductive bases.
• Always store and transport electronic modules or components in ESD-safe conductive
packaging, e.g. metallized plastic or metal containers. Leave the component in its
packaging until installation.
NOTICE
Storage and transport
If you have to store or transport the component in non-conductive packaging, you must first
pack the component in ESD-safe, conductive material, e.g., conductive foam rubber, ESD
bag.
ESD guidelines
B.1 Electrostatic sensitive devices (ESD)
3VA molded case circuit breakers with IEC certificate
650 Manual, 03/2019, A5E03603177010-03
The diagrams below illustrate the required ESD protective measures for electrostatic
sensitive devices.
(1) ESD seat
(2) ESD standing position
(3) ESD seat and ESD standing position
Protective measures
a Conductive floor
b ESD table
c ESD footwear
d ESD smock
e ESD bracelet
f Cubicle ground connection
Figure B-1 ESD work center
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 651
List of abbreviations
C
C.1
List of abbreviations
Overview
Table C- 1 Meaning of abbreviations used in this document
Abbreviation
Meaning
AC Alternating voltage
ACT ACTIVE (ready signal)
AL ALARM (pre-alarm)
ASCII
[Modbus interface]
American Standard Code for Information Interchange
ATAM Adjustable Thermal Adjustable Magnetic Trip Unit (adjustable thermal over-
load release, adjustable magnetic trip unit with short-circuit protection)
ATFM Adjustable Thermal Fixed Magnetic Trip Unit (adjustable thermal overload
release, permanently set magnetic trip unit with short-circuit protection)
ATSE Automatic Transfer Switching Equipment
AUX Auxiliary switch
C Common
CB-S Circuit Breaker Switch (standard auxiliary switch (NO contact))
CD Compact Disk
COM-DO COM-Draw-out-Kit
DC Direct voltage
DIN Deutsches Institut für Normierung e. V. (German Institute for Standardization)
DISCON DISCONNECT
DO Draw out
EFB External Function Box
ESD Electrostatic sensitive devices
EMC Electromagnetic compatibility
EN European standard
ETU Electronic trip unit
FTAM Fixed thermal adjustable magnetic trip unit (permanently set thermal overload
release, adjustable magnetic trip unit with short-circuit protection)
FTFM Fixed thermal fixed magnetic trip unit (permanently set thermal overload re-
lease, permanently set magnetic trip unit with short-circuit protection)
G Ground fault (protection)
GF [tripping
characteristic]
Ground fault
HH-fuse High-voltage fuses
List of abbreviations
C.1 List of abbreviations
3VA molded case circuit breakers with IEC certificate
652 Manual, 03/2019, A5E03603177010-03
Abbreviation
Meaning
I Instantaneous (short-circuit protection)
I Isolated
I / O Input / Output
IEC International Electrotechnical Commission
INST [tripping
characteristic]
INST [tripping characteristic]
INSTA Final distribution area
IP International Protection
IT Injection Tester
IT Isolated ground, French: "Isolé Terre"
L Long-time delay (overload protection)
L Overload release
LBS Load Break Switch (switch disconnector)
LCS Leading changeover switch
LI Overload protection (L) and instantaneous short-circuit protection (I)
LIG Overload protection (L), instantaneous short-circuit protection (I) and ground-
fault protection (G)
LIN Overload protection (L), instantaneous short-circuit protection (I) and neutral-
conductor protection (N)
LSI Overload protection (L), short-time delayed short-circuit protection (S) and
instantaneous short-circuit protection (I)
LSIN Overload protection (L), short-time delayed short-circuit protection (S), instan-
taneous short-circuit protection (I) and neutral-conductor protection (N)
LSING Overload protection (L), short-time delayed short-circuit protection (S), instan-
taneous short-circuit protection (I) and ground-fault protection (N)
LT [tripping
characteristic]
Partial overload range of the characteristic curve of a switching device
MCCB Molded case circuit breaker
MO Motor operator
MRCD Modular residual current device [without integrated trip device]
N Neutral conductor
NC Normally closed contact
NEMA National Electrical Manufacturers Association
NFPA National Fire Protection Association
NO Normally open contact
LV Low voltage
LV fuse Low-voltage fuse
PAC Power Analysis & Control
PI Plug-in (unit)
RCD Residual Current Device
R RESET
RCR Residual Current Release
REC Reclose (automatic reset)
RJ [connector] Registered Jack
List of abbreviations
C.1 List of abbreviations
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 653
Abbreviation
Meaning
RMS Root Mean Square
RS [interface] Formerly: Radio Selector; now usually: Recommended Standard
RTU
[Modbus interface]
Remote Terminal Unit
SAS Short circuit alarm switch
PLC Programmable logic controller
ST Shunt trip
STF Shunt trip flexible
STL Shunt trip left
T Test
T [IT systems] French: Terre (ground)
TC Test device for molded case circuit breaker or MRCD, suitable for systems
with grounded phase
TCP Transmission Control Protocol
TD Test Device
TM Thermal Magnetic
TMTU Thermal Magnetic Trip Unit
TRIP-IND TRIP INDICATOR (trip alarm switch)
TRUE RMS TRUE root-mean-square
TU Trip Unit
UAR Universal release
UL Underwriters Laboratories Inc.
UR Undervoltage release
USB Universal Serial Bus
UPS Uninterruptible power supply
UVR Undervoltage release
VDE Verband der Elektrotechnik Elektronik Informationstechnik e.V. (Association of
German Electrical Engineers)
VDI Verein Deutscher Ingenieure (Association of German Engineers)
ZSI Zone selective interlocking
List of abbreviations
C.1 List of abbreviations
3VA molded case circuit breakers with IEC certificate
654 Manual, 03/2019, A5E03603177010-03
Table C- 2 Meanings of symbols and abbreviations
Sym-
bol/abbreviation
Meaning
Δt Delay time
I
Δn Residual current; rated residual current; response current
I
1 Inrush current
I
"KG Initial balanced short-circuit current
I
2t Let-through energy
I
B Take-over current
I
b Pickup value blocking protection
I
cm Making capacity; rated short-circuit making capacity
I
cn Rated breaking capacity; rated short-circuit breaking capacity
I
cs Maximum short-circuit breaking capacity (partial selectivity); rated service short-
circuit breaking capacity
I
cu Maximum short-circuit breaking capacity (full selectivity); rated ultimate short-circuit
breaking capacity
I
cw Rated short-time withstand current; rated short-time current
I
d Prospective current; residual current; response residual current
I
D Let-through current
I
g Ground-fault protection; ground-fault release; ground-fault current setting value
I
i Instantaneous tripping current; instantaneous short-circuit protection; instantaneous
magnetic protection; rated tripping current of instantaneous trip
I
k Short-circuit current
I
KD Uninterrupted short-circuit current
I
K MAX Maximum short-circuit current
I
Kmaxline Uninterrupted short-circuit current of system
I
n Rated operational current
I
nG Rated operational current (generator)
I
P Rated peak withstand current, impulse short-circuit current
I
q Rated conditional short-circuit current that a switching device (e.g. power contac-
tor,) protected by a short-circuit protective device (e.g. motor protection breaker)
can carry for the duration of the tripping delay of the protective device.
I
r Thermal protection; setting current; response value; current setting value of adjust-
able overload protection (pickup value overload protection)
I
s Limit current with selectivity; maximum short-circuit current for selectivity limit
I
sc Prospective current
I
sd Short-time delayed tripping current; response current of S protection; short-time
delayed short-circuit release; short-time delayed short-circuit protection; delay time
of S protection
I
th Conventional free-air thermal current
I
U Rated uninterrupted current
R
A Contact resistance of exposed conductive part ground
t
1 Time of inrush current
t
2 Ramp up time
t
A Safety clearance
List of abbreviations
C.1 List of abbreviations
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 655
Sym-
bol/abbreviation
Meaning
t
b Delay time (delay of blocking time)
t
d Response time
t
g Delay time associated with the adjustable response current; trip time associated
with ground-fault current setting value
t
i "Virtual" trip time of I protection; highest trip time associated with rated tripping
current of instantaneous trip
T
p Trip time; delay time; time-lag class
t
r Trip time associated with current setting value of adjustable overload protection
t
sd Trip time associated with short-time delayed tripping current; delay time of S pro-
tection
t
S Fuse pre-arcing time
t
ZSI Delay time of all molded case circuit breakers which detect the short circuit but do
not receive a blocking signal when ZSI is activated.
U
Voltage across main contacts of the molded case circuit breaker
U
e Maximum voltage; rated operational voltage
U
Nn Nominal system voltage
List of abbreviations
C.1 List of abbreviations
3VA molded case circuit breakers with IEC certificate
656 Manual, 03/2019, A5E03603177010-03
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Manual, 03/2019, A5E03603177010-03 657
Conversion tables
D
The U.S. units can be converted to the corresponding European/metric units using the
conversion tables listed.
Note
No liability assumed for completeness or accuracy
No liability can be assumed for the completeness or accuracy of the values listed in this
section of the manual.
Conversion of North American cross section dimensions into metric cross section dimensions
Metric cross-sections in accordance with VDE (Verband Deutscher Elektroingenieure
(Association of German Electrical Engineers)) (mm2) ↔ conductor cross-sections in
accordance with AWG (American Wire Gauge) or kcmil (Thousand Circular Mils)
AWG ↔ mm2 conversion table
AWG / kcmil
Diameter
d/mm
mm2
Metric equivalent [mm2]
AWG
20 0.81 1) 0.52 0.75
18 1.02 1) 0.82 1
16 1.29 1) 1.3 1.5
14 1.63 1) 2.08 2.5
12 2.05 1) 3.31 4
10 2.59 1) 5.26 6
8 3.26 1) 8.4 10
6 4.12 1) 13.3 16
4 5.19 1) 21.2 25
2 6.54 1) 33.6 35
1 7.34 1) 42.4 50
1 / 0 8.25 1) 53.5 —
2 / 0 9.27 1) 67.4 70
3 / 0 10.4 1) 85.0 95
4 / 0 11.68 1) 107 120
1) Diameters over Solid Conductors and Cross-Sectional Area for All Solid and Stranded Conductors
Source: Standard UL 83
Conversion tables
3VA molded case circuit breakers with IEC certificate
658 Manual, 03/2019, A5E03603177010-03
kcmil ↔ mm2 conversion table
AWG / kcmil
Diameter
d/mm
mm2
kcmil
250 14.6 1) 126
300 16 1) 152
350 17.3 1) 177
400 18.49 1) 203
500 20.65 1) 253
600 22.68 1) 304
800 26.16 1) 405
1000 29.26 1) 507
1500 35.86 1) 760
2000 41.45 1) 1010
1) Diameter over Round Concentric-Lay-Stranded Conductors for Classes B, C and D
Source: Standard UL83
Other conversions
Conversion factors for units of length
Length
Conversion factor
1 inch (") 25.4 millimeters (mm)
1 centimeter 0.3937 inches (")
Conversion factors for units of weight
Weight
Conversion factor
1 ounce (Oz.) 28.35 grams (g)
1 pound (lb.) 0.454 kilograms (kg)
1 kilogram (kg) 2.205 pounds (lb.)
Pound (lb.)
Ounce (Oz.)
Conversion for units of temperature
Temperature
100 degrees Centigrade (°C) 212 degrees Fahrenheit (°C)
80 °C 176 °F
60 °C 140 °F
40 °C 104 °F
20 °C 68 °F
0 °C 32 °F
Conversion tables
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 659
Temperature
- 5 °C 23 °F
- 10 °C 14 °F
- 15 °C 5 °F
- 20 °C - 4 °F
- 25 °C - 13 °F
- 30 °C - 22 °F
Conversion factors for tightening torques
Tightening torque
Conversion factor
1 Newton meter (Nm) 8.85 lb
F
in, 8.85 lb-in (inch-pound)
1.36 Newton meter (Nm) 1 lb
F
ft, 1 lb-ft (food-pound)
0.113 Newton meter (Nm) 1 lb
F
in, 1 lb-in (inch-pound); 1 / 12 lb-ft
Conversion tables
3VA molded case circuit breakers with IEC certificate
660 Manual, 03/2019, A5E03603177010-03
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Glossary
AUTO
Method of remote operation of the motor operators via control cables, e.g. PLC.
Breaking capacity
The breaking capacity is the rms value of the current at a specific cos φ (power factor) and a
specific voltage which can be safely interrupted by a switching device or fuse under
prescribed conditions. The rms value of the symmetrical component applies in the case of
alternating current.
I2t characteristic
The
I
2t characteristic is a curve which represents the minimum or maximum values of
I
2t in
relation to break times as a function of the prospective current under defined operating
conditions.
I2t value
The
I
2t value is the thermal value of a prospective or a limited short-circuit current (let-
through current).
Let-through current
The let-through current
I
D is the maximum instantaneous current value during the breaking
time of a switching device or fuse. Limited short-circuit currents occur if the switching device
reduces the amplitude of the short-circuit current due to, for example, resistance, switching
delay and peak arc voltage. The let-through current of a device such as a current-limiting
fuse or a current-limiting molded case circuit breaker determines the thermal load (
I
2t value)
imposed on equipment connected downstream of the device (current limiting).
LOCK
Operating mode of motor operators; the operating mechanism is locked and cannot be
operated.
Making capacity
The making capacity is the value of the prospective making current which the switching
device can safely conduct at the instant of closing under prescribed conditions for a specific
circuit.
Glossary
3VA molded case circuit breakers with IEC certificate
662 Manual, 03/2019, A5E03603177010-03
For molded case circuit breakers, the making capacity is expressed as the maximum
possible instantaneous value of the potential prospective current at the input terminals for
the specified voltage.
MANUAL
Local, manual operating mode of motor operators.
Protective characteristic
The protective characteristic is determined by the rated operational current and the setting
and tripping values of the circuit breaker.
Rated breaking capacity
The rated breaking capacity is the maximum current that can be interrupted by a switching
device under certain conditions.
Rated frequency
Design frequency for a switching device and reference value for other characteristics of the
device.
Rated making capacity
The rated making capacity is the maximum current that a switching device can conduct at
the instant of closing in accordance with the utilization category at the relevant rated
operational voltage.
Rated operational current
The rated operational current
I
n for molded case circuit breakers is equivalent to the rated
uninterrupted current
I
U and to the conventional free-air thermal current
I
th.
Rated operational voltage
The rated operational voltage
U
e of a switching device, e.g. a molded case circuit breaker, is
the voltage which serves as a reference to state other characteristics of the device. The
maximum rated operational voltage must never be higher than the rated insulation voltage.
With multi-phase circuits, the specified voltage is generally the phase-to-phase voltage.
Rated peak withstand current, impulse short-circuit current
Maximum permissible instantaneous (peak) value of the prospective short-circuit current in
the current path under the highest load. It characterizes the dynamic short-circuit strength of
a switching device.
Glossary
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 663
Rated residual current
The rated residual current
I
Δn is the fault (residual) current for which residual current-
operated circuit breakers are designed. The residual current rating is declared on the rating
plate of the device.
Rated service short-circuit breaking capacity
The rated service short-circuit breaking capacity
I
cs is the short-circuit current determined by
the operational voltage that a molded case circuit breaker is capable of interrupting
repeatedly (test sequence 0 - C0 - CO, formerly P - 2). After a molded case circuit breaker
has interrupted a short circuit, it can continue to carry the rated operational current despite
increased self-heating and will trip again in the event of a short circuit.
Rated short-circuit breaking capacity
The rated short-circuit breaking capacity
I
cn of a molded case circuit breaker is the maximum
current that the circuit breaker can safely interrupt at a specific rated operational voltage and
rated frequency. It is specified as an rms value.
With AC molded case circuit breakers, the rated short-circuit breaking capacity must be
independent of the magnitude of the DC component. The rated short-circuit breaking
capacity also ensures that the molded case circuit breaker can interrupt every current up to
the rated short-circuit breaking capacity in the event of a line-frequency recovery voltage with
110% of the rated operational voltage.
This applies:
● To alternating current at every value of the power factor, but not lower than the value
defined in the relevant test specification.
● To direct current (unless otherwise specified by the manufacturer) with every time
constant, but not greater than the value defined in the relevant test specification.
The short-circuit breaking capacity does not apply in the event of a recovery voltage at line
frequency above 110% of the rated operational voltage.
Rated short-circuit making capacity
The rated short-circuit making capacity
I
cm of a molded case circuit breaker is the maximum
current that the circuit breaker can safely interrupt at a specific rated operational voltage and
rated frequency. Unlike other characteristic data, this is specified as a peak value.
With AC molded case circuit breakers, the rated short-circuit making capacity must be at
least equal to the rated short-circuit breaking capacity multiplied by a factor n.
The rated short-circuit making capacity is calculated to allow the molded case circuit breaker
to conduct the current during closing at a voltage of up to 110% inclusive of the rated
operational voltage.
Glossary
3VA molded case circuit breakers with IEC certificate
664 Manual, 03/2019, A5E03603177010-03
Rated short-time current
Permissible rms value of the AC component of the prospective short-circuit current which the
switching device is capable of conducting for a specific time period, e.g. from 0.05 s to 1 s
(thermal short-circuit strength).
Rated short-time withstand current
The rated short-time withstand current
I
cw is specified as an rms value of the short-circuit
current and characterizes the thermal strength of a circuit of a switchgear assembly under
brief load conditions. The rated short-time withstand current calculation normally refers to a
period of 1 s. The reference time must be specified if it deviates from the above. The rated
short-time withstand current is specified for the distribution and/or main busbars of a
switchgear assembly.
Rated ultimate short-circuit breaking capacity
The rated ultimate short-circuit breaking capacity
I
cu is the maximum short-circuit current that
a molded case circuit breaker is capable of interrupting (test sequence 0 - C0, formerly P -
1). After the molded case circuit breaker has cleared the short circuit, it is capable of tripping
with increased tolerances under overload conditions.
Limit value of rated ultimate short-circuit breaking capacity
I
cu.
Rated uninterrupted current
The rated uninterrupted current
I
U of a switching device, e.g. a molded case circuit breaker,
is a current that the device can conduct in uninterrupted operation (for weeks, months or
years). This current is specified by the manufacturer.
Rating
The rating is the power that a switching device is capable of switching at the associated
rated operational voltage in accordance with the utilization category, e.g. power contactor
utilization category AC-3:37 kW at 400 V.
Remote control
Or AUTO; method of remote operation of the motor operators via control cables, e.g. PLC.
Short circuit
Connection with a negligibly low impedance between two points of different potential in an
electric circuit. The short-circuit current is a multiple of the rated operating current. Short
circuits can cause thermal or mechanical damage to switching devices and other parts of an
electrical installation.
Glossary
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 665
Short-circuit strength
This is the resistivity of a switching device in the closed state, along with its components
(e.g. releases), or a complete switchboard, to the electrodynamic and thermal stresses which
arise in the event of a short circuit.
The characteristic for the dynamic stress is the rated peak withstand current, which is the
maximum instantaneous value of the short-circuit current.
The characteristic for the thermal stress of the short-circuit current is the root-mean-square
value of the short-circuit current throughout its duration.
Tripping current of overload release
The current value at which a trip unit trips within a specified time.
Tripping current, ground fault
When the ground-fault current reaches or exceeds this limit value, the ground-fault
protection, for example, of a molded case circuit breaker, is tripped.
Tripping current, instantaneous
When this current limit is exceeded, the circuit breaker trips instantaneously.
Tripping current, overload
When this uninterrupted current limit is exceeded within a predefined time period, the circuit
breaker trips (inverse-time delayed tripping!).
Tripping current, short-time delayed
When this current limit is exceeded, the circuit breaker trips after a predefined time delay.
Tripping time
Period of time from the instant of commencement of trip command output to the moment at
which the command becomes irrevocable (timing concept for the tripping of circuit breakers).
Glossary
3VA molded case circuit breakers with IEC certificate
666 Manual, 03/2019, A5E03603177010-03
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 667
Index
3
3VA connection options, 486
3VA1, 17
Switch disconnector, 165
3VA2, 18
4
400 Hz system, 179
A
Accessories
3VA1, 185
3VA2, 185
Color coding, 37
Combinability, 186
Internal, 191
Mounting locations, 191
Overview, 28
Switch disconnector, 165
ACT, 417, 429
Adapter kit cylinder lock, 366, 370
Advanced RCD820, (RCD820)
AL, 417, 429
AL1, 460
AL2, 460
Alarm, 399, 417, 429, 453
Alarm display
Draw-out technology, 296
ETU, 98
Alarm switch, 197, 199, 202, 202, 468
Electrical alarm switch EAS, 199
Position signaling switch, 295
Residual current device, 405, 423, 441, 460
Short-circuit alarm switch SAS, 200
Ambient conditions, 58
Ambient temperature, 58
Application examples, 21
Applications, 15
Arcing space, 61
AUTO, 341
Autotrip plunger, 281, 289
Auxiliary circuit connector, 301
Auxiliary contact, 423, 441, 459
Auxiliary release, 204
Auxiliary switch, 197, 202
AUX, 198
Leading changeover switch LCS, 198
Position signaling switch, 295
B
Basic RCD310, (RCD310)
Basic RCD510, (RCD510)
Bowden cable, 374
Length, 375
Box terminal, 219
Control wire tap, 270
Breaker data server
Draw-out technology, 293
Breaking capacity, 51, 51
3VA2, 52
Direct current, 174
Breaking capacity class, 51
Bus connectors extended
Edgewise, 238
Front, 234
Bus connectors offset, 236
Busbar connector
Control wire tap, 271
Busbars, 213
C
Cable stripping, 213
Cables, 211
Cables and busbars
Busbars, 213
Cables, 211
CB-S, 462
Certification, 58
Characteristic curve, 72
Circuit breaker identification, 42
Circuit breaker labels, 42
Circuit Breaker Switch, 462
Clearance, 61
Climatic requirements, 58
COM060 communication module
Draw-out technology, 293
COM800 / COM100 breaker data server, 486
Index
3VA molded case circuit breakers with IEC certificate
668 Manual, 03/2019, A5E03603177010-03
Communication
DSP800 display, 489
ETU application areas, 488
ETU protection functions, 488
Communications interface, 300, 468
Complete kit
Draw-out technology, 287
Plug-in technology, 279
Components
3VA1, 47
3VA2, 48
Compression lugs, 213
Conductive floor, 650
CONNECT (draw-out version), 286
Connection information, 44
Connection stud, 242
Connection stud flat, 244
Connection technology
Control wire tap, 269
Factory-assembled, 217
Overview, 214
Contact system, 50
Control elements, 36
Control wire tap, 269
Conversion kit, 279, 288
Plug-in technology, 279
Correction factor (derating), 632
Cover frame, 528
Labeling plate, 530
Tolerance compensation, 529
Cubicle ground connection, 650
Current limiting, 49
Current selectivity, 54
Current sensor, 103
Current setting value, 75
Current transformer for N conductor, 525
Cylinder lock, 365, 369
D
DC insulating plate, 251
Delay time (RCD), 403, 421, 435, 458
Derating, 58, 111
3VA1, 628
Correction factor, 632
Switch disconnector, 639
Design
3VA1, 47
3VA2, 48
Digital input (EFB300), 496
Digital output (EFB300), 496
Dimension
MO310 motor operator, 600
SEO520 motor operator with stored energy
operator, 602
Dimensions
Accessories for locking, blocking and
interlocking, 603
Basic unit, 565
Communication and system integration, 619
Connection technology, 572, 577
Manual operators, 587
MO320 motor operator, 601
Plug-in and draw-out units, 584
Residual current devices, 614
Test devices, 621
DIN rail, 382
DIN rail adapter, 531, 531
Discharge, 649
DISCON (draw-out version), 286
Display
Power supply, 131
Tripped, 344, 400, 418, 431, 455
Display (ETU), 96
Symbols, 96
Distributed neutral conductor, 79
Door feedthrough, 304
Door interlock
Door mounted rotary operator, 317
Front mounted rotary operator, 314
Door mounted rotary operator
Door interlock, 317
Illumination kit, 330
Interlocking, 327
Locking, 325, 326
Supplementary handle, 320
Tolerance compensator, 318
Variable depth adapter, 321
Double-break contact system, 50
Double-rotary contact system, 50
Draw-out technology, 273, 288, 293, 300
Auxiliary circuit connector, 301
Complete kit, 287
Conversion kit, 288
Defined position, 286
Installation overview, 275
Position signaling switch, 295
Rear interlock, 384
Residual current device, 394
Sliding clutch, 286
Variable depth adapter, 321
Draw-out unit
Indication of switching positions, 33
Index
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 669
DSP800 display, 489
Dynamic selectivity, 54
E
EFB300, 495
Functions, 498
Operating mode, 501
Test mode, 503
ZSI (zone selective interlocking), 499
EFB300 external function box, 495
Electromagnetic compatibility, 57
Electronic trip unit, (ETU), 87
Electrostatic sensitive devices, 649
EMC (electromagnetic compatibility), 57
EMERGENCY-STOP, 345
Energy flow direction, 105
Energy management
powermanager, 494
ESD bracelet, 650
ESD footwear, 650
ESD protective measures, 650
ESD seat, 650
ESD smock, 650
ESD standing position, 650
ESD table, 650
ETU, 19, 70
Connections, 89
Display, 95
Line protection, 115
Operator controls, 93
Parameter, 116, 119, 127, 132, 135
Setting parameters, 101
ETU (electronic trip unit), 87
External current transformers for N conductor, 525
F
Fire protection, 387
Free tripping, 46
Front mounted rotary operator
Door interlock, 314
Indication of the breaker status, 313
Interlocking, 327
Locking, 326
Full selectivity, 55
G
G release, 76
Ground-fault protection, 76, 387
H
Handle blocking device, 374, 377
HP switch, 197
HQ switch, 197
I
I2t characteristic, 75
Illumination kit, 330
Indication of the breaker status, 285, 313
Motor operator, 340
Installation aid rear interlock, 382
Installation altitude, 59
Instantaneous short-circuit protection, 76
Insulating measures, 252
Insulating plate, 250
Insulation accessories, 246
Insulation test, 401, 456
Interlock combinations, 373, 376
Handle blocking device, 378
Rear interlock, 381
Interlocking, 361, 361, 369
Bowden cable, 374
Combinations, 373, 376, 378, 381
Door mounted rotary operator, 327
Electrical, 204
Front, 369, 369
Front mounted rotary operator, 327
Handle blocking device, 374, 377
Installation aid, 382
Mounting plate, 382
Plug-in and draw-out units, 384
Rear, 379, 379
Releasing a different molded case circuit
breaker, 373
Side wall mounted rotary operator, 327
Interlocking module, 380, 384
Interlocking rod, 380
Isolating features, 166
IT system, 181
Insulating measure, 251
K
Key data, 43
Knowledge Manager, 43
L
Labeling plate (cover frame), 530
Index
3VA molded case circuit breakers with IEC certificate
670 Manual, 03/2019, A5E03603177010-03
Labels, 42
Limitation of rated operational current
3VA2, 641
Line protection, 110
Load acceptance, 102
Load management, 102
Load shedding, 102
LOCK, 341
Locking, 360, 360
Door mounted rotary operator, 325, 326
Front mounted rotary operator, 324, 326
Rotary operator with shaft stub, 326
Side wall mounted rotary operator, 325, 326
M
Magnetic trip unit with short-circuit protection, 85
MANUAL, 341
Measured value display (ETU), 99
Meter test (TD500), 521
MO320, 339
MO320 modes, 341
Modular residual current device, 478
Molded case circuit breaker
3VA1, 17
3VA2, 18
Monitoring, 429
Motor operator, 339, 341
Reset mode, 344
Mounting locations, 191
Mounting plate, 323, 382
MRCD, 393, 478, (Parameterization)
N
Neutral conductor
Protection, 79
Neutral conductor protection, 79
No-load switching operation, 204, 544, 553
Nut keeper kit, 233
Right-angled, 240
O
Offset compensator, 319
Operating mode (EFB300), 501
Operation of molded case circuit breaker, 46
Optional installation variants, 32
Overload protection, 75
P
Padlock device
Cylinder lock, 365
Handle, 363
INSTA distribution board, 364
Parameter display (ETU), 100
Partial selectivity, 55
Personnel safety, 387
Phase barrier, 247
Plant monitoring, 494
Plug-in technology, 272, 279
Auxiliary circuit connector, 301
Complete kit, 279
Installation overview, 275
Rear interlock, 384
Residual current device, 394
Pollution degree, 58
Position signaling switch, 295
Possible uses, 14
Power loss
3VA1, 141, 626
3VA2, 142, 627
Power monitoring, 494
Power monitoring system, 494
powerconfig, 490, 491, 522
powermanager, 494
Pre-alarm, 417, 429
Pre-alarm threshold, 460
Protection in the case of indirect contact, 387
R
Rated ultimate short-circuit breaking capacity, 51
RCD310, 397
Function overview, 414
RCD320, 415
Function overview, 427
RCD510, 398
Function overview, 414
RCD520, 415
Function overview, 427
RCD520B, 428
Function overview, 451
RCD820, 452
Function overview, 469
RCD-to-ETU connecting cable, 467, 468
RCR, 406, 412
Reference point, 75
Relay contact, 460
Release
Auxiliary release, 204
Index
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03 671
RCR, 412
Shunt trip, 204
Undervoltage release, 205
Universal release, 205
Remote test button:, 461
REMOTE-T, 461
Requirements (climatic), 58
Reset mode, 344
Residual current, 386
Residual current device, 386
Alarm switch, 423, 441
Combination with 3VA circuit breaker, 394
Communications interface, 468
Design, 386
DIN rail adapter, 532
Insulation test, 401, 419, 432, 456
Loadside, 452
Modular, 393, 478, 478
Parameterization, 402, 420, 434, 479
RCD-to-ETU connecting cable, 467, 468
Residual current waveform, 386
Side mounted, 397
Sizes, 388
Summation current transformer, 478, 479
Switch disconnector, 388
Residual current release (RCR), 406, 412
Response current, 403, 421, 435, 457
Rogowski coil, 103
Rotary operator
Switching position, 35
With shaft stub, 326
S
Sealing option, 422, 440, 459
Selective contact system, 19
Selectivity, 53
Setting trip parameters, 74
Shock resistance, 59
Short circuit
Alarm switch, 200
Short-circuit protection
Instantaneous, 76
Short-time delayed, 76
Short-time delayed short-circuit protection, 76
Shunt trip, 204, 406, 482
Side plate, 251
Side wall mounted rotary operator
Illumination kit, 330
Interlocking, 327
Locking, 325, 326
Mounting plate, 323
Terminal plate, 323
Signaling of position, 293
SIMARIS design, 73
Sizes
3VA molded case circuit breaker, 16
Residual current device, 388
Standard display (ETU), 98
Standards, 57
Status indication, 35
Storage, 649
Storage temperature, 58
Summation current transformer, 478, 479
Supplementary handle, 320
Switch, 197
Switch disconnector, 165, 388
Accessories, 165
Coordination table, 170
Isolating features, 166
Making capacity, 167
Upstream protection, 170
Utilization category, 167
Switching position indication
CONNECT, 33
DISCON, 33
TEST, 33
UNBLOCK, 33
Switching positions of molded case circuit breaker, 46
T
T slot, 426, 449, 465
Tappet extension, 384
TD300, 509
Trip test, 512
TD300 activation and trip box, 509
TD500, 513
Stored data, 517
Test, 519
TD500 test device, 513
Technical specifications, (EFB300 external function
box)
3VA switch disconnectors, 24
3VA1 molded case circuit breakers, 24
3VA2 molded case circuit breakers, 26
Alarm switch, 202
Auxiliary circuit connector, 307
Auxiliary release, 206
Auxiliary switch, 202
Motor operator, 358
Position signaling switch, 307
RCD, 473
Index
3VA molded case circuit breakers with IEC certificate
672 Manual, 03/2019, A5E03603177010-03
TD300, 512
TD500 test device, 524
Technical Support, 10
Terminal cover, 248
Extended, 249
Offset, 250
Plug-in and draw-out units, 305
Terminal lug, 213
Terminal plate, 323
Test
EFB300, 503
Free tripping (TRIP), 46
Residual current device, 401, 419, 432, 456
TD300 activation and trip box, 512
TD500 test device, 519
TEST (draw-out version), 286
Test mode (EFB300), 503
Test transformers (TD500), 521
Thermal memory, 75
Thermal trip unit, 85
Thermal-magnetic trip unit, (TMTU)
Threshold value, 102
Through-hole technology, 411
Time selectivity, 54
Time-delay device, 209
TMTU, 70, 85
400 Hz system, 179
Line protection, 111
Parameter, 112, 113, 114
Trip unit type, 86
Tolerance compensation
Cover frame, 529
Tolerance compensator, 318
TRANS (TD500), 522
Transport, 649
Trip alarm switch
RCD310/RCD510, 405
RCD320/RCD520, 423
RCD520B, 441
RCD820, 460
TAS, 199
TRIP INDICATOR, 423, 441, 460
Trip parameters setting, 74
Trip test (TD300), 512
Trip unit, 70
Trip unit type, 86
Tripping characteristic, 72
Tripping characteristic (RCD520B), 434
Type of protection, 68
U
Ultimate selectivity value, 54
UNBLOCK (draw-out version), 286
Undervoltage release, 205, 482
Time-delay device, 209
Universal release, 205
V
Variable depth adapter, 321
Vibration resistance, 59
W
Wire connector, 222
2 cables, 227
3VA25, 231
6 cables, 229
Control wire tap, 270
Large, 225
Z
Zone selective interlocking, 54, 54, 82
3WL compatibility, 82
Operating principle, 83
ZSI (zone selective interlocking), 54, 82, 499
