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SENTRON
Circuit breakers
3WT
Operating Instructions
12/2018
9239 0020 176 06
Safety notes
1
General
2
Product description
3
Installation
4
Connection
5
Electronic components
6
Auxiliary release and
auxiliary switches
7
Commissioning
8
Maintenance
9
Accessories
10
Troubleshooting
11
Dimension drawings
12
Circuit diagrams
13
Siemens AG
Division Energy Management
Postfach 32 20
91050 ERLANGEN
GERMANY
Document order number: 3ZX1812-0WT82-0AN0
Ⓟ
12/2018 Subject to change
Copyright © Siemens AG 2008.
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.
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 5
Table of contents
1 Safety notes ............................................................................................................................................... 9
2 General .................................................................................................................................................... 11
2.1 Standard specifications ........................................................................................................... 11
2.2 Transport ................................................................................................................................. 12
3 Product description .................................................................................................................................. 15
3.1 Design ..................................................................................................................................... 15
3.1.1 Circuit breaker ......................................................................................................................... 15
3.1.2 Guide frame ............................................................................................................................ 16
3.2 Label ....................................................................................................................................... 17
3.3 Indicators of the Circuit breaker .............................................................................................. 18
4 Installation ............................................................................................................................................... 19
4.1 Installation ............................................................................................................................... 19
4.2 Racking in/out of the Circuit breaker ....................................................................................... 21
4.3 Position of the Circuit breaker in the guide frame ................................................................... 25
4.4 Remove the Circuit breaker from guide frame ........................................................................ 26
4.5 Inserting the Circuit breaker in the guide frame ...................................................................... 27
4.6 Door sealing frame IP41 ......................................................................................................... 28
5 Connection .............................................................................................................................................. 31
5.1 Connecting bar ........................................................................................................................ 31
5.1.1 Horizontal connection ............................................................................................................. 31
5.1.2 Vertical connection .................................................................................................................. 32
5.1.3 Front connection ..................................................................................................................... 34
5.2 Connecting the main conductor .............................................................................................. 36
5.3 Connecting the auxiliary conductor ......................................................................................... 40
5.4 Connection for protective conductor ....................................................................................... 43
6 Electronic components ............................................................................................................................ 45
6.1 Overcurrent release - functional overview .............................................................................. 45
6.2 ETU35WT overcurrent release ............................................................................................... 47
6.3 ETU37WT overcurrent release ............................................................................................... 49
6.4 ETU45WT overcurrent release ............................................................................................... 52
6.5 ETU47WT overcurrent release ............................................................................................... 55
6.6 Indicators on the overcurrent release ..................................................................................... 59
6.7 Protection functions ................................................................................................................ 61
Table of contents
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6 Operating Instructions, 12/2018, 9239 0020 176 06
6.7.1 Basic protection functions ...................................................................................................... 61
6.7.2 LT: Overload protection (Long time), L-tripping ..................................................................... 61
6.7.3 ST: Short-time delay short-circuit release (Short time), S tripping ........................................ 62
6.7.4 INST: Instantaneous short-circuit release (Instantaneous), I-tripping ................................... 63
6.7.5 GF: Ground-fault protection (Ground-fault), G-tripping .......................................................... 64
6.7.6 N: Neutral conductor protection (Neutral), N-tripping ............................................................ 65
6.8 Additional functions ................................................................................................................ 66
6.8.1 Phase-failure protection ......................................................................................................... 66
6.8.2 Thermal memory (can be switched on/off) ............................................................................ 66
6.9 Menus on the ETU35WT ETU37WT display ......................................................................... 67
6.10 Alphanumeric display of ETU45WT and ETU47WT .............................................................. 69
6.10.1 Modifying the displays inclination ........................................................................................... 69
6.10.2 Menu structure ....................................................................................................................... 71
6.11 Communication ...................................................................................................................... 78
6.12 Breaker Status Sensor (BSSWT) ........................................................................................... 80
6.13 COM16WT module ................................................................................................................ 82
6.14 Metering function ................................................................................................................... 85
6.15 External voltage supply .......................................................................................................... 88
7 Auxiliary release and auxiliary switches ................................................................................................... 91
7.1 Overview ................................................................................................................................ 91
7.2 Setting the delay time of the undervoltage release ................................................................ 93
8 Commissioning ........................................................................................................................................ 95
8.1 Charging the stored-energy spring mechanism ..................................................................... 95
8.1.1 Manual charging..................................................................................................................... 95
8.1.2 By means of motorized operating mechanism ....................................................................... 96
8.2 Preparing for operation .......................................................................................................... 97
8.3 Closing operation ................................................................................................................... 98
8.4 Opening operation ................................................................................................................. 98
8.5 Recommissioning after opening operation by means of overcurrent release ....................... 99
9 Maintenance .......................................................................................................................................... 101
9.1 Preparatory work .................................................................................................................. 102
9.2 Checking the arc chutes ...................................................................................................... 104
9.3 Checking the wear on the contacts ...................................................................................... 105
9.4 Replacing the conducting paths ........................................................................................... 105
9.5 Internal self-test of the overcurrent release function ............................................................ 118
9.6 Internal self-test of Circuit breaker with tripping operation................................................... 120
9.7 Replacing the overcurrent release ....................................................................................... 122
10 Accessories ........................................................................................................................................... 125
10.1 Accessories .......................................................................................................................... 125
Table of contents
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Operating Instructions, 12/2018, 9239 0020 176 06 7
10.2 Accessories - general ........................................................................................................... 126
10.2.1 Removing the operating device ............................................................................................ 127
10.2.2 Installing the operating device .............................................................................................. 128
10.3 Hand-held test device ........................................................................................................... 129
10.4 External transformer for neutral conductors ......................................................................... 134
10.4.1 External transformer for neutral conductors (for ETU37WT ... ETU47WT) .......................... 134
10.4.2 External ground fault current transformer (only for ETU47WT) ............................................ 136
10.5 Retrofitting the internal N transformer ................................................................................... 137
10.6 Counting mechanism ............................................................................................................ 140
10.7 Castell lock ............................................................................................................................ 142
10.8 3WT lock (set), 3 locks with 2 keys ....................................................................................... 148
10.9 Mechanical interlock ............................................................................................................. 154
10.9.1 Information about mechanical interlock ................................................................................ 154
10.9.2 Mechanical interlock of fixed-mounted Circuit breakers ....................................................... 161
10.9.3 Mechanical interlock of withdrawable Circuit breakers ......................................................... 167
10.9.4 Installing Bowden wire .......................................................................................................... 172
10.10 Door interlock ........................................................................................................................ 175
10.10.1 Door interlock for fixed-mounted Circuit breaker .................................................................. 175
10.10.2 Door interlock for guide frame .............................................................................................. 179
10.11 Phase barrier ........................................................................................................................ 182
10.11.1 Phase barrier for fixed-mounted Circuit breaker ................................................................... 183
10.11.2 Phase barrier for guide frame ............................................................................................... 189
10.12 Automatic mechanical resetting device after overcurrent tripping ........................................ 192
10.13 Switching from fixed-mounted Circuit breakers to withdrawable Circuit breakers ...............
198
10.14 Vertical connections for fixed-mounted Circuit breaker ........................................................ 207
10.15 Connection bars for guide frame (frame size I) .................................................................... 211
10.16 Connection bars / connection pieces for guide frame version FS II ..................................... 214
10.17 Position signaling switch for guide frame ............................................................................. 218
10.18 Shutters ................................................................................................................................. 221
10.19 Arc chute cover ..................................................................................................................... 228
11 Troubleshooting ..................................................................................................................................... 233
12 Dimension drawings .............................................................................................................................. 235
12.1 Fixed-mounted Circuit breaker, Frame size I, 3 pole and 4 pole .......................................... 235
12.2 Fixed-mounted Circuit breaker, Frame size II, 3 pole and 4 pole ......................................... 237
12.3 Withdrawable Circuit breaker, Frame size I, 3 pole and 4 pole ............................................ 239
12.4 Withdrawable Circuit breaker, Frame size II, 3 pole and 4 pole ........................................... 241
12.5 Accessories 3 pole / 4 pole ................................................................................................... 243
12.6 Door cutout 3 pole / 4 pole .................................................................................................... 244
12.7 Current transformer for N conductor ..................................................................................... 245
Table of contents
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8 Operating Instructions, 12/2018, 9239 0020 176 06
13 Circuit diagrams ..................................................................................................................................... 247
13.1 Overall circuit diagram ......................................................................................................... 247
13.2 Circuit diagram for undervoltage release with delay ............................................................ 249
13.3 Terminal diagrams ............................................................................................................... 250
Glossary ................................................................................................................................................ 251
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 9
Safety notes
1
Safety notes
3WT
10 Operating Instructions, 12/2018, 9239 0020 176 06
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 11
General
2
2.1
Standard specifications
DANGER
Hazardous voltage
During operation, certain Circuit breaker and guide frame components are subject to
hazardous voltages or spring force.
Note the operating instructions and warnings.
If these are not observed, this can result in death, severe injury, or substantial material
damage.
Ambient conditions
The Circuit breakers are designed to be operated in enclosed rooms in which the operating
conditions are not affected by dust or corrosive vapors/gases. Suitable enclosures must be
used in dusty or damp conditions
Technical specifications
For information about technical specifications, see the Catalog LV 35.
Standards
GB/T 14048.2
IEC 60947-2
EN 60947-2
General
2.2 Transport
3WT
12 Operating Instructions, 12/2018, 9239 0020 176 06
2.2
Transport
Overseas packaging
Check the humidity indicator plate.
• Sealed packaging ineffective.
• Check Circuit breaker for corrosion.
• Report any damage to transport company.
Good
Long-term storage
● Replace or dry the desiccant.
● Seal the plastic film.
● Check the packaging regularly.
Unpacking and storing the Circuit breaker
Unpack the Circuit breaker and make sure that it was not damaged during transportation.
If the Circuit breaker or guide frame is not to be installed immediately, it must be stored and
shipped in its original packaging only.
For withdrawable Circuit breaker:
● Racking in/out of the Circuit breaker (Page 21)
● Remove the Circuit breaker from guide frame (Page 26)
● Inserting the Circuit breaker in the guide frame (Page 27)
CAUTION
Do not place the Circuit breaker on its back.
General
2.2 Transport
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 13
Transportation with crane
Caution!
Do not place the Cir-
cuit breaker on its
back.
Circuit breaker
guide frame
Circuit breaker + guide frame
Frame size / no. of
poles
Weight for reference
I / 3
I / 4
II / 3
II / 4
38 Kg
51 Kg
63 Kg
76 Kg
23 Kg
28 Kg
37 Kg
48 Kg
61 Kg
79 Kg
100 Kg
124 Kg
Setting down the guide frame
Only set it down on its base plate.
If the surface is uneven, use a level base.
General
2.2 Transport
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14 Operating Instructions, 12/2018, 9239 0020 176 06
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 15
Product description
3
3.1
Design
3.1.1
Circuit breaker
① Arc chute
⑫ Draw-out window
②
Options label
⑬
Position indicator
③
Carrying handle
⑭
CASTELL Locking
④ Counting indicator
⑮ Overcurrent release (ETU)
⑤
Type label
⑯
" Mechanical OFF" button
⑥
Store-energy indicator
⑰
" Mechanical ON" button
⑦
Racking pictogram
⑱
Breaker ON/OFF indicator
⑧
Ready to close indicator
⑲
Reset button
⑨ Spring charging lever
⑳ Front panel
⑩
Breaker foot Receptacle for auxiliary contacts
⑪
Draw-out unit transport shaft
Product description
3.1 Design
3WT
16 Operating Instructions, 12/2018, 9239 0020 176 06
3.1.2
Guide frame
①
Hole for crane hook
⑨
Guide rail
② Crane hook label
⑩ Disconnecting contacts
③
Type label guide rail
⑪
Locking device shutter
④
Shutter plate (option)
⑫
Shutter operating device (option)
⑤ Grounding terminal
⑬ Position signaling switch (option)
⑥
Door interlocking (option)
⑭
Crank handle
⑦
Coding screw
⑮
Auxiliary disconnects
⑧ Locking device guide rail
Product description
3.2 Label
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 17
3.2
Label
Circuit breaker options label
(With terminal designations)
Type label Circuit breaker
Product description
3.3 Indicators of the Circuit breaker
3WT
18 Operating Instructions, 12/2018, 9239 0020 176 06
3.3
Indicators of the Circuit breaker
Indicator label
Color
Green
Blue
Red
Position status Disconnection Test Connection
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 19
Installation
4
4.1
Installation
WARNING
Before installing the device, make sure that the minimum distances from insulated,
grounded, and live components in the switchgear are observed.
Details can be found in Catalog LV 35.
Installation position
WARNING
Breaker mounted tilted towards the frontside: Breaker may slide out on rails, when racked
in disconnect position.
Installation
4.1 Installation
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20 Operating Instructions, 12/2018, 9239 0020 176 06
Installation on a horizontal surface
For fixed-mounted Circuit breakers:
4 x M8-8.8 bolts + strain washers
For withdrawable Circuit breakers:
Attaching the base plate: 4 x M8-8.8 bolts + nuts + washers
Arc chute cover
If several draw-out Circuit breakers are arranged one above the other in cubicles without
compartment bases we recommend to use arc chute covers.
See chapter Arc chute cover (Page 228)
Installation
4.2 Racking in/out of the Circuit breaker
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 21
4.2
Racking in/out of the Circuit breaker
NOTICE
The Circuit breaker must only be racked once the operator panel has been mounted and
secured.
If a shutter is installed, a change of direction is not permitted while the Circuit breaker is
being racked until a defined position has been reached (disconnected/test/connected
position).
Note
The indicator on the Circuit breaker
- position latching is not provided.
The position can only be checked via the indicator on the Circuit breaker.
Installation
4.2 Racking in/out of the Circuit breaker
3WT
22 Operating Instructions, 12/2018, 9239 0020 176 06
Racking out
1.
Press the OFF button and open the slide switch simultaneously.
2.
Insert crank handle and racking out
3.
Turn to test position
4.
Turn to disconnected position
5.
Remove crank handle
6.
Close the slide switch
Installation
4.2 Racking in/out of the Circuit breaker
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 23
Racking in
1.
Press the OFF button and open the slide switch simultaneously.
2.
Insert crank handle and racking in
3.
Turn to test position
4.
Turn to connected position
5.
Remove crank handle
6.
Close the slide switch
Installation
4.2 Racking in/out of the Circuit breaker
3WT
24 Operating Instructions, 12/2018, 9239 0020 176 06
Lockable
Attaching the racking handle
1.
Secure the brackets
2.
Attach the racking handle
Note
The racking handle can also be attached on the right
-hand side.
Installation
4.3 Position of the Circuit breaker in the guide frame
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 25
4.3
Position of the Circuit breaker in the guide frame
Diagram
Position and display
Main and auxiliary circuit
Cubicle door
Shutter
The auxiliary terminals of the
breaker are outside of the
auxiliary connector blocks of
the guide frame.
Open
closed
The auxiliary terminals of the
breaker are inside the auxilia-
ry connector blocks of the
guide frame.
The guide rails are back in
their initial position.
Closed
closed
Main circuits disconnected
Auxiliary circuits connected
Closed
closed
Main circuits connected
Auxiliary circuits connected
Closed
open
①
Main circuit
②
Auxiliary circuit
③
Shutter
④ Cubicle door
Installation
4.4 Remove the Circuit breaker from guide frame
3WT
26 Operating Instructions, 12/2018, 9239 0020 176 06
4.4
Remove the Circuit breaker from guide frame
Remove the Circuit breaker
Interlocking device
Block the shutter.
The guide rails can be blocked by means of two padlocks to prevent installation of a Circuit
breaker.
Installation
4.5 Inserting the Circuit breaker in the guide frame
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 27
4.5
Inserting the Circuit breaker in the guide frame
NOTICE
Please remove the lock if there is any.
1.
Pull out the guide rails.
2.
Insert the Circuit breaker.
3.
lift it up slightly
4. Push it to the end stop of the disconnected position. The correct position can be identified as the
guiding rails must be again back in their initial position, and the auxiliary contacts hidden.
Close the cubicle door.
Installation
4.6 Door sealing frame IP41
3WT
28 Operating Instructions, 12/2018, 9239 0020 176 06
4.6
Door sealing frame IP41
Preparing the switchgear door
①
Mounting surface of Circuit breaker or guide frame
②
Centre of front panel
③
Eight mounting holes for the door sealing frame
Installation
4.6 Door sealing frame IP41
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Operating Instructions, 12/2018, 9239 0020 176 06 29
Installing the sealing frame
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 31
Connection
5
5.1
Connecting bar
WARNING
Attention, the fastening screws above and below the connection bars on the back of the
guide frame are voltage-carrying!
See chapter Dimension drawings (Page 235)
The 3-pole products are taken as examples in below images which are just for reference,
and for detailed information please see Catalog LV35.
5.1.1
Horizontal connection
The horizontal connection is the standard connection for fixed-mounted Circuit breakers and
guide frame.
Connection
5.1 Connecting bar
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32 Operating Instructions, 12/2018, 9239 0020 176 06
5.1.2
Vertical connection
Fixed-mounted breaker
Take 3-pole product as an example:
Frame size I:
≤ 1250 A, N/S class; 1600 A, N class;
1600 A, S class;
Frame size II:
≤ 2500 A
3200 A
Vertical terminals left and right asymmetrical
Frame size II:
4000 A
Vertical terminals left and right asymmetrical
Connection
5.1 Connecting bar
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 33
Guide frame
Take 3-pole product as an example:
Frame size I:
≤ 1250 A, N/S class; 1600 A, N class;
1600 A, S class;
Frame size II:
≤ 2500 A
3200 A
Vertical terminals left and right asymmetrical
Frame size II:
3800 A
Vertical terminals left and right asymmetrical
Connection
5.1 Connecting bar
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34 Operating Instructions, 12/2018, 9239 0020 176 06
5.1.3
Front connection
Fixed-mounted breaker
Frame size I:
≤ 1250 A, N/S class; 1600 A, N class;
1600 A, S class;
Front connection with double hole
( holes according to DIN 43673)
Frame size II:
≤ 2500 A
3200 A
Front connection with double hole
( holes according to DIN 43673)
Connection
5.1 Connecting bar
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 35
Guide frame
Frame size I:
≤ 1250 A, N/S class; 1600 A, N class;
1600 A, S class;
Front connection with double hole
( holes according to DIN 43673)
Frame size II:
≤ 2500 A
3200 A
Front connection with double hole
( holes according to DIN 43673)
Connection
5.2 Connecting the main conductor
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36 Operating Instructions, 12/2018, 9239 0020 176 06
5.2
Connecting the main conductor
Cleaning the main conductor connection
Cleaning the copper bars
Main conductor connection
Terminal screws with strain washers
(internal diameter = 12 mm to DIN 6769-Fst)
M12
Recommended tightening torque
70 Nm
Required screw strength
8.8 to DIN 267
Connecting the Circuit breaker with front connections
1. Disconnect the main/control circuits from the power supply and set the withdrawable
Circuit breaker to the maintenance position.
2. Open the Circuit breaker mechanically.
Please see chapter Preparatory work (Page 102)
Connection
5.2 Connecting the main conductor
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 37
In systems with connection points accessible from the rear
1.
Remove the arc chutes.
2.
Secure the system-side rails.
3.
Attach arc chutes
Connection
5.2 Connecting the main conductor
3WT
38 Operating Instructions, 12/2018, 9239 0020 176 06
In systems with connection points not accessible from the rear
1.
Remove the arc chutes.
2.
Remove the screws and pull out the operator panel.
3.
Unlock the secondary disconnect and remove it by pulling it up.
4.
Swing the secondary disconnect forward.
5.
Secure the system-side rails.
6.
Attach arc chutes
Connection
5.2 Connecting the main conductor
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 39
7.
Swing the secondary disconnect backward.
8.
Snap on the secondary disconnect.
9.
Attach and secure the operator panel.
Supporting the main conductor
Reinforcing the main conductor
①
Horizontal connection
②
Vertical connection
③
Front connection
Connection
5.3 Connecting the auxiliary conductor
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40 Operating Instructions, 12/2018, 9239 0020 176 06
5.3
Connecting the auxiliary conductor
For fixed-mounted Circuit breakers
Conductor connection to connector
1.
Release latching.
2.
Connect the conductor (note the coding).
3.
Attach the encoded connector.
Note
Route the auxiliary conductor only in the front section of the Circuit breaker.
Connection
5.3 Connecting the auxiliary conductor
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 41
For withdrawable Circuit breakers
Connection between conductor and connector
1.
Connect the connector.
2.
Connect the conductor.
Note
Route the auxiliary conductor only in the front section of the circuit breaker.
Connection
5.3 Connecting the auxiliary conductor
3WT
42 Operating Instructions, 12/2018, 9239 0020 176 06
System-side routing of auxiliary conductor
①
Auxiliary conductor
②
Area in which auxiliary conductor is routed
③
Area in which auxiliary conductor must not be routed
Article No. for spare part
Description
Article No.
Auxiliary supply connector for fixed-mounted Circuit breakers
3WT9825-1JC00
Auxiliary supply connector for guide frame
3WT9827-1JA00
Connection
5.4 Connection for protective conductor
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 43
5.4
Connection for protective conductor
Fixed-mounted Circuit breaker
Guide frame
Connection for protective conductor.
Connection
5.4 Connection for protective conductor
3WT
44 Operating Instructions, 12/2018, 9239 0020 176 06
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 45
Electronic components
6
6.1
Overcurrent release - functional overview
NOTICE
We have checked the content of this manual to ensure that it is consistent with the
hardware and software described. Discrepancies cannot be wholly excluded, however,
which means that we cannot assume responsibility for the correctness of the information
provided here.
The information in this manual is reviewed on a regular basis and any necessary
corrections are included in subsequent editions.
Overcurrent protection settings
CAUTION
Adjust parameters only when the Circuit breaker is switched off.
If the parameters are modified with the circuit-breaker switched on, this can trip the Circuit
breaker unintentionally.
CAUTION
When planning a project and considering selectivity it has to be ensured loads carried by
the Circuit breaker will not exceed the breaking capacity stated in the 3WT catalogue.
Upstream protection equipment has to be set in a way, that these faults are interrupted
safely.
All parameters are adjusted with rotary coding switches.
Electronic components
6.1 Overcurrent release - functional overview
3WT
46 Operating Instructions, 12/2018, 9239 0020 176 06
Overview of functions
Overcurrent release
Functions
ETU35WT
ETU37WT
ETU45WT
ETU47WT
LT: Overload protection (Long time), L-tripping
✓
✓
✓
✓
Thermal memory can be switched on/off
—
—
✓
✓
ST: Short-time delay short-circuit protection (Short time), S-tripping ✓ ✓ ✓ ✓
Short-time can be switched ON/OFF
—
—
✓
✓
Short-time delay short-circuit protection to I2t — — ✓ ✓
INST: Instantaneous short-circuit protection (Instantaneous), I-tripping
✓
1)
✓
1)
✓
✓
Instantaneous can be switched on/off
—
—
✓
✓
N: Neutral conductor protection (N Neutral), N-tripping
—
✓
✓
✓
Neutral conductor protection can be switched on/off
—
✓
✓
✓
GF: Ground-fault protection, G-tripping
—
✓
—
✓
Ground-fault characteristic can be switched to I
2
t
—
—
—
✓
Ground-fault alarm
—
—
—
✓
Load monitoring
—
—
✓
✓
Leading signal “L-tripping”
—
—
✓
✓
Motor protection function
✓
✓
✓
✓
Alphanumerical display
✓
✓
✓
✓
Communication via CubicleBUS
—
—
Ο
Ο
Communication via Modbus RTU
—
—
Ο
Ο
Metering function
—
—
Ο
Ο
Parameterization by rotary coding switches
✓
✓
✓
✓
Remote parameterization of additional functions
—
—
✓
✓
Provision for connecting to an external 24 V DC power supply
—
—
✓
✓
✓
Standard
Ο
Optional
—
Not available
1)
Fixed
Electronic components
6.2 ETU35WT overcurrent release
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 47
6.2
ETU35WT overcurrent release
1)
The reason for tripping is stored for at least two days provided that the overcurrent r
e-
lease was active for at least 20 minutes prior to tripping.
NOTICE
To protect the electrostatically-sensitive devices, the enclosed protective cap must be
placed on the test socket.
Before the protective cap is removed, the breakers must be connected to ground, and the
operators must have the same potential.
Electronic components
6.2 ETU35WT overcurrent release
3WT
48 Operating Instructions, 12/2018, 9239 0020 176 06
Protection functions
● LT: Overload protection (Long time), L-tripping (Page 61)
● ST: Short-time delay short-circuit release (Short time), S tripping (Page 62)
● INST: Instantaneous short-circuit release (Instantaneous), I-tripping (Page 63)
Characteristic curves
The diagram below only shows the setting ranges of the different parameters. Tolerance
ranges are not taken into account here.
L, S, I tripping operation
With a one-pole load in the lowest rated current range, the response times of the short-circuit
release can increase by approx. 10 % and the tripping times by approx. 15 % with respect to
the characteristic curve.
Electronic components
6.3 ETU37WT overcurrent release
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 49
6.3
ETU37WT overcurrent release
1)
The reason for tripping is stored for at least two days provided that the overcurrent
release was active for at least 20 minutes prior to tripping.
NOTICE
To protect the electrostatically-sensitive devices, the enclosed protective cap must be
placed on the test socket.
Before the protective cap is removed, the breakers must be connected to ground, and the
operators must have the same potential.
Electronic components
6.3 ETU37WT overcurrent release
3WT
50 Operating Instructions, 12/2018, 9239 0020 176 06
Protection functions
● LT: Overload protection (Long time), L-tripping (Page 61)
● ST: Short-time delay short-circuit release (Short time), S tripping (Page 62)
● INST: Instantaneous short-circuit release (Instantaneous), I-tripping (Page 63)
● GF: Ground-fault protection (Ground-fault), G-tripping (Page 64)
● N: Neutral conductor protection (Neutral), N-tripping (Page 65)
Characteristic curves
The diagram below only shows the setting ranges of the different parameters. Tolerance
ranges are not taken into account here.
L, S, I, N tripping operation
With a one-pole load in the lowest rated current range, the response times of the short-circuit
release can increase by approx. 10 % and the tripping times by approx. 15 % with respect to
the characteristic curve.
Electronic components
6.3 ETU37WT overcurrent release
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 51
G tripping operation
Due to the activation limits of 150 A (FSI) and 200 A (FSII), a ground fault response value of
100 A cannot be ensured with a one-phase load. In this case, the minimum response value
is Ig = 300 A.
Electronic components
6.4 ETU45WT overcurrent release
3WT
52 Operating Instructions, 12/2018, 9239 0020 176 06
6.4
ETU45WT overcurrent release
1)
The reason for tripping is stored for at least two days provided that the overcurrent
release was active for at least 20 minutes prior to tripping.
NOTICE
To protect the electrostatically-sensitive devices, the enclosed protective cap must be
placed on the test socket.
Before the protective cap is removed, the breakers must be connected to ground, and the
operators must have the same potential.
Electronic components
6.4 ETU45WT overcurrent release
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 53
Protection functions
● LT: Overload protection (Long time), L-tripping (Page 61)
● ST: Short-time delay short-circuit release (Short time), S tripping (Page 62)
● INST: Instantaneous short-circuit release (Instantaneous), I-tripping (Page 63)
● N: Neutral conductor protection (Neutral), N-tripping (Page 65)
Characteristic curves
The diagram below only shows the setting ranges of the different parameters. Tolerance
ranges are not taken into account here.
L, N tripping operation
Electronic components
6.4 ETU45WT overcurrent release
3WT
54 Operating Instructions, 12/2018, 9239 0020 176 06
S tripping operation
With a one-pole load in the lowest rated current range, the response times of the short-circuit
release can increase by approx. 10 % and the tripping times by approx. 15 % with respect to
the characteristic curve.
I tripping operation
With a one-pole load in the lowest rated current range, the response times of the short-circuit
release can increase by approx. 10 % and the tripping times by approx. 15 % with respect to
the characteristic curve.
Electronic components
6.5 ETU47WT overcurrent release
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 55
6.5
ETU47WT overcurrent release
1)
The reason for tripping is stored for at least two days
provided that the overcurrent re-
lease was active for at least 10 minutes prior to tripping.
2)
The changeover switch is on the side of the ETU.
NOTICE
To protect the electrostatically-sensitive devices, the enclosed protective cap must be
placed on the test socket.
Before the protective cap is removed, the breakers must be connected to ground, and the
operators must have the same potential.
Electronic components
6.5 ETU47WT overcurrent release
3WT
56 Operating Instructions, 12/2018, 9239 0020 176 06
Protection functions
● LT: Overload protection (Long time), L-tripping (Page 61)
● ST: Short-time delay short-circuit release (Short time), S tripping (Page 62)
● INST: Instantaneous short-circuit release (Instantaneous), I-tripping (Page 63)
● GF: Ground-fault protection (Ground-fault), G-tripping (Page 64)
● N: Neutral conductor protection (Neutral), N-tripping (Page 65)
L, N tripping operation
Electronic components
6.5 ETU47WT overcurrent release
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 57
S tripping operation
With a one-pole load in the lowest rated current range, the response times of the short-circuit
release can increase by approx. 10 % and the tripping times by approx. 15 % with respect to
the characteristic curve.
I tripping operation
With a one-pole load in the lowest rated current range, the response times of the short-circuit
release can increase by approx. 10 % and the tripping times by approx. 15 % with respect to
the characteristic curve.
Electronic components
6.5 ETU47WT overcurrent release
3WT
58 Operating Instructions, 12/2018, 9239 0020 176 06
G tripping
Due to the activation limits of 150 A (FSI) and 200 A (FSII), a ground fault response value of
100 A cannot be ensured with a one-phase load. In this case, the minimum response value
is Ig = 300 A.
Electronic components
6.6 Indicators on the overcurrent release
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 59
6.6
Indicators on the overcurrent release
The indicators provided depend on the overcurrent release type.
Overcurrent release is activated
I > Imin
Imin:
150 A for frame size I
200 A for frame size II
Overcurrent alarm
Continuous light, if I ≥ IR
Communication active
Another
Cubicle
BUS participant has been recognised
and communication started.
Electronic components
6.6 Indicators on the overcurrent release
3WT
60 Operating Instructions, 12/2018, 9239 0020 176 06
Protection function has tripped (overcurrent)
• Indicator lights up when the "QUERY" button is
pressed
• Only one reason for tripping is displayed
• Only the last reason for tripping is displayed
T.U. ERROR LED
1st T.U. Error flashes:
The protection function is restricted; the protection
parameters are reset to the minimum values.
Cause:
• Overcurrent release defective
2nd T.U. Error lights up continuously:
The protection function is not ensured.
Cause:
• Overcurrent release defective
Electronic components
6.7 Protection functions
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 61
6.7
Protection functions
6.7.1
Basic protection functions
The protection functions of the overcurrent release are available without an additional
auxiliary voltage. The required energy is supplied via current transformers integrated in the
Circuit breaker.
To evaluate the currents, the RMS value is calculated by the electronic components of the
overcurrent release.
The individual functions are parameterized by means of rotary coding switches.
Note
Tolerances for the setting currents
L: tripping operations between 1.05 and 1.2 x I
R
S:
- 0 %, + 20 %
I:
- 0 %, + 20 %
G:
- 0 %, + 20 %
Tolerances for the tripping times
L:
- 20 %, + 0 % for I2t characteristic
S:
- 0 %, + 60 ms or - 0 %, + 10 % for characteristic with fixed delay time
I: < 50
ms
G:
- 0 ms, + 60 ms or - 0 %, + 10 % for characteristic with fixed delay time
6.7.2
LT: Overload protection (Long time), L-tripping
The setting value IR determines the maximum continuous current at which the Circuit breaker
can operate without tripping. The time-lag class tR determines for how long an overload can
be present without causing a trip.
Setting values for IR
ETU35WT ... ETU47WT
IR = (0.4 / 0.45 / 0.5 / 0.55 / 0.6 / 0.65 / 0.7 / 0.8 / 0.9 / 1.0) x In
Setting values for tR
ETU35WT, ETU37WT
t
R
= 10 s (at 6 x I
R
)
ETU45WT, ETU47WT
tR = 2 / 3.5 / 5.5 / 8 / 10 / 14 / 17 / 21 / 25 / 30 s (at 6 x IR)
The tripping characteristic curve exhibits an I2t characteristic.
When the motor protection function is active, a different tR setting applies (see next page).
Electronic components
6.7 Protection functions
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62 Operating Instructions, 12/2018, 9239 0020 176 06
6.7.3
ST: Short-time delay short-circuit release (Short time), S tripping
With the overcurrent releases, tripping caused by a short-circuit current Isd can be delayed by
tsd.
This enables selectivity with respect to short-circuit protection in switchgear with more than
one grading level.
Setting values for Isd
ETU35WT ... ETU47WT
Isd = (1.25 / 1.5 / 2 / 2.5 / 3 / 4 / 6 / 8 / 10 / 12) x In
Setting values for tsd
ETU35WT, ETU37WT
t
sd
= 0 / 0.02(M)
1)
/ 0.1 / 0.2 / 0.3 / 0.4 s
ETU45WT, ETU47WT
t
sd
= 0.02(M)
1)
/ 0.1 / 0.2 / 0.3 / 0.4 s; OFF
1)
The delay time 0.02 s is not a grading time.
In this setting, the motor protection function is activated.
With the setting value tsd = 0 s, the ETU35WT and ETU37WT overcurrent releases can
support instantaneous short-circuit protection with a variable response value that is lower
than the fixed response value Ii.
The "OFF" setting for the ETU45WT and ETU47WT overcurrent releases is used to
deactivate short-time delay short-circuit protection.
The ETU45WT and ETU47WT overcurrent releases support switching to a I2t characteristic.
Motor protection function
A special protection function for electromotive drives is activated with the Circuit breaker
setting tsd=(0.02 s). This prevents the short-time delay short-circuit release from
responding to the inrush peak of electric motors. At the same time, phase-failure protection
is activated and the time constant for the internal, arithmetic simulation of the warming and
cooling process is switched from plant protection to motor protection.
ETU35WT and ETU37WT:
When motor protection is active, the time-lag class is also set in such a way that, regardless
of the default setting tR = 10 s, the tripping time for overload protection is 11.2 s @ 7 x IR,
which means that it lies within the tolerance band of class 20 (6 < tp ≤ 20 s).
ETU45WT and ETU47WT:
When motor protection is active, the time-lag class is not influenced automatically. For
reaching the tripping time for overload protection in the tolerance band of class 20 set the
parameter tR = 17 s.
Electronic components
6.7 Protection functions
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 63
Short-time characteristic
The ETU45WT and ETU47WT overcurrent releases support switching from a constant delay
time to an I2t characteristic. The delay time thus becomes dependent on the short-circuit
current when the I2tsd value is constant, thereby improving selectivity with downstream fuses.
In this case, the setting options for the time-lag class change as follows:
Setting values for tsd
ETU45WT, ETU47WT
tsd = 0.1 / 0.2 / 0.3 / 0.4 s (at 12 x In)
You can switch to the I2tsd-dependent characteristic using the tsd rotary coding switch by
setting it to one of the white values.
6.7.4
INST: Instantaneous short-circuit release (Instantaneous), I-tripping
When the setting value Ii is exceeded, this causes the Circuit breaker to trip instantaneously.
Setting values for Ii
ETU35WT, ETU37WT Ii ≥ 20 x In (fixed)
MAX = 50 kA
ETU45WT, ETU47WT
OFF1)
Ii = (1.5 / 2.2 / 3 / 4 / 6 / 8 / 10 / 12 × In)
MAX = 0.8 x I
CS
1)
When the I tripping operation is deactivated, the breaking capacity of the Circuit breaker
drops to I
CS = ICW.
With the ETU45WT and
ETU47WT overcurrent releases, short-time delay (setting
t
sd = OFF) and instantaneous (Ii = OFF) short-circuit protection cannot be deactivated
simultaneously.
If the setting I
i = OFF is chosen when tsd = OFF, the system automatically corrects itself
to I
i
= 1.5 x I
n
.
Electronic components
6.7 Protection functions
3WT
64 Operating Instructions, 12/2018, 9239 0020 176 06
6.7.5
GF: Ground-fault protection (Ground-fault), G-tripping
If the overcurrent release is equipped with a ground fault protection function, this can protect
consumers against excessive ground fault currents.
Ground fault detection can be implemented in two ways:
● By means of vectorial summation of the currents of the external conductors and N
conductor
● For ETU47WT: direct measurement of the ground fault current with a separate
transformer 1200 A : 1 A
In conjunction with the delay time setting tg, the response value Ig defines the disconnection
of ground faults.
Setting values for Ig
ETU37WT, ETU47WT
Ig = 100 / 300 / 600 / 900 / 1200 A
Setting values for tg
ETU37WT, ETU47WT
t
g
= 0.1 / 0.2 / 0.3 / 0.4 / 0.5 s
The ETU47WT overcurrent release supports switching to a I2t characteristic.
Ground-fault characteristic
Ground fault protection for the ETU47WT overcurrent release supports switching from a
constant delay time to an I2t characteristic.
This results in a tripping characteristic with a current-dependent delay time when the I2tg
value is constant and, in switchgear with more than one grading level, improves selectivity
with respect to ground fault protection.
Setting values for tg
ETU47WT
t
g
= 0.1 / 0.2 / 0.3 / 0.4 / 0.5 (at 3 x I
g
)
You can switch to the I2tg-dependent characteristic using the tg rotary coding switch
(ETU47WT) by setting it to one of the white values.
Electronic components
6.7 Protection functions
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 65
6.7.6
N: Neutral conductor protection (Neutral), N-tripping
The ETU37WT … ETU47WT overcurrent releases allow the neutral conductor to be
protected against overload. A current transformer for the neutral conductor (which can be
retrofitted if necessary) is required for this purpose.
With respect to tripping, the same time-lag class tR as that for the overload trip applies.
Setting values for IN
ETU37WT
IN = In; OFF
ETU45WT, ETU47WT IN = (0.5 / 1.0) × In; OFF
Electronic components
6.8 Additional functions
3WT
66 Operating Instructions, 12/2018, 9239 0020 176 06
6.8
Additional functions
6.8.1
Phase-failure protection
When the Circuit breaker setting is tsd = (0.02s), phase-failure protection is activated.
If the operational current on the phase with the lowest load is 50% less than the operational
current of the phase with the highest load when phase-failure protection is active, the setting
value IR is automatically reduced to 80%. If the three phase currents do not differ by more
than 50% with respect to each other, the setting value IR applies.
6.8.2
Thermal memory (can be switched on/off)
The ETU45WT and ETU47WT overcurrent releases enable the internal, arithmetic
simulation of the thermal processes in downstream plants and consumers to continue even
when the Circuit breaker is open. This helps ensure effective protection against thermal
overload even with frequent closing/opening operations and fluctuating loads.
Response in overload range:
● Above 1.125 x IR: the system heats up strictly in accordance with the characteristic curve.
Response in the rated current range:
● Below 1.125 x IR: no heating.
● The system cools down in accordance with the exponential function with a time constant
of 18 x tR for plant protection or 10 x tR for motor protection.
Response when _ParaSwitchTherm = ON:
When the thermal memory is switched on, the thermal history is taken into account:
● After a tripping operation, the thermal memories of the phases are defaulted with the
equivalent of heat of the warmest phase reduced to 90% (enables reactivation).
● The system cools down in accordance with the exponential function with a time constant
of 18 x tR for plant protection or 10 x tR for motor protection.
Upon reactivation, the cooling during the deactivation phase is simulated by the software
over max. 60 minutes.
Response when _ParaSwitchTherm = OFF:
When the thermal memory is switched off, the thermal history is not taken into account:
● Upon activation, the release always starts with heat memory ZERO.
● After a tripping operation, the thermal memories of the phases are set to ZERO.
The thermal memory can be activated by means of a slide switch (ETU45WT, ETU47WT).
Electronic components
6.9 Menus on the ETU35WT ETU37WT display
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 67
6.9
Menus on the ETU35WT ETU37WT display
When you press the menu button briefly (< 1 s), you can switch from one menu to another.
The following consecutive menu displays can be selected:
Current in phase L1
Current in phase L2
Current in phase L3
Current in neutral conductor
(for ETU37WT only)
Ground fault current
(for ETU37WT only)
Current of phase with highest load of L1, L2, L3, and N
Electronic components
6.9 Menus on the ETU35WT ETU37WT display
3WT
68 Operating Instructions, 12/2018, 9239 0020 176 06
The reason for tripping is displayed during a tripping operation.
LT tripping operation
ST tripping operation
INST tripping operation
N tripping operation
(for ETU37WT only)
Ground
-fault tripping
(for ETU37WT only)
Electronic components
6.10 Alphanumeric display of ETU45WT and ETU47WT
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 69
6.10
Alphanumeric display of ETU45WT and ETU47WT
Design
①
Screen (4 lines with 20 characters each)
②
Up-key
③
Down-key
6.10.1
Modifying the displays inclination
At the factory, the alphanumeric display is installed with a downward inclination. However, it
can be turned by 180°; the display is then inclined upwards.
DANGER
Hazardous voltage!
Will cause death, serious personal injury, or equipment / property damage.
Disconnect power before working on this equipment.
- Switch off and discharge the storage spring
- Switch off external 24 V DC voltage supply, if applicable
- Remove trip unit sealing cap
Electronic components
6.10 Alphanumeric display of ETU45WT and ETU47WT
3WT
70 Operating Instructions, 12/2018, 9239 0020 176 06
Removing the display
Installing the display turned by 180° and latching it tight
Switch on external 24 V DC voltage supply, if applicable
Electronic components
6.10 Alphanumeric display of ETU45WT and ETU47WT
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 71
6.10.2
Menu structure
After the supply voltage has been applied, the display changes from “Power-up screen” to
“Autoscroll” mode after about 5 s. Thereafter, further modes can be accessed by means of
the two buttons.
Overview
"Autoscroll" mode
During normal operation, the display is in “Autoscroll” mode
To access Autoscroll mode, press the following button(s)
In mode “Fixed screen display”
In mode “Tripping counter reset”
In mode “Contrast setting”
In mode “Parameter setting”
Do not press any button for 10 seconds
In mode “Tripping info”
In this mode, the display automatically changes to the next screen every 5 seconds.
If there is no metering module available, the display changes continuously between the
screens 1 and 2.
Electronic components
6.10 Alphanumeric display of ETU45WT and ETU47WT
3WT
72 Operating Instructions, 12/2018, 9239 0020 176 06
If there is a metering module available, a total of five screens are displayed in “Autoscroll”
mode.
Screens displayed in the “Autoscroll” mode
without metering module
Current I1
Current I2
Current I3
Current IN
Ground-fault current Ig
(A value is only displayed if an ground-fault protection module is
fitted.)
with metering module installed, additionally
Active power P
Apparent power S
Reactive power Q
Power factor
Voltage U12
Voltage U23
Voltage U31
Energy (positive direction)
Energy (negative direction)
Present direction of energy flow Frequency
NOTICE
The data to be displayed are updated every time the screen page is set up again. No
updates take place when a screen page is being displayed.
Button functions in the “Autoscroll” mode
Display is frozen Switchover to mode “Fixed screen display”
Change to mode “Parameter setting”
Change to mode “Contrast setting”
Electronic components
6.10 Alphanumeric display of ETU45WT and ETU47WT
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 73
Mode "Fixed screen display"
To access “Fixed screen display” mode, press the following button:
In “Autoscroll” mode
In this mode, maintenance information is provided with the number of Circuit breaker trips
and switching operations as well as with maintenance instructions. The information displayed
depends on the number of Circuit breaker trips operations.
Number of tripping operations
Number of switching operations
Number of tripping operations
Number of switching operations
Maintenance instructions
Button functions in mode “Fixed screen display”
Change to next higher screen level
Change to “Autoscroll” mode
If screen 6 is displayed
Change to mode “Tripping counter reset”
Submode "Tripping counter reset"
This mode offers the possibility to reset the counter for the trips and the switching operations
to zero.
CAUTION
If the counter is reset without contact maintenance having been performed, the
maintenance information displayed will not correspond to the actual condition of the
contacts. This can destroy the contacts.
To access “Tripping counter reset mode”, press the following button(s)
In the mode “Fixed screen dis-
play”, when screen 6 is displayed
Electronic components
6.10 Alphanumeric display of ETU45WT and ETU47WT
3WT
74 Operating Instructions, 12/2018, 9239 0020 176 06
Screens displayed in mode “Tripping counter reset”
This screen is used for safety queries.
Reset the counter after contact maintenance only!
Counter reset for trips and switching operations confirmed.
Button functions in mode “Tripping counter reset”
If screen 1 is displayed
Cancelling, no counter reset to zero
Change to “Autoscroll” mode
Counter reset to zero
Change to screen 2
If screen 2 is displayed
Change to “Autoscroll” mode
Mode "parameter setting"
CAUTION
Adjust parameters only when the Circuit breaker is switched off.
If the parameters are modified with the Circuit breaker switched on, this can trip the Circuit
breaker unintentionally.
In this mode, the following parameters can be adjusted:
- load shedding
- load restore
- delay time for load shedding/load restore
- language setting for display
To access “Parameter setting” mode, press the following button(s):
In “Autoscroll” mode
Electronic components
6.10 Alphanumeric display of ETU45WT and ETU47WT
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 75
Screens displayed in the mode “Parameter setting”
Setting
Load shedding
Setting
Load restore
Setting
Delay time
Load shedding/load restore
Setting
Display language
XXXX may be ENGL for english or DEUT for german
(Remark: this is not available for Chinese version.)
Parameter settings are being changed, switches to “Autoscroll”
mode after 10 seconds
NOTICE
When screen 1, 2, 3 or 4 is displayed and no key is pressed within 10 seconds, mode
“Parameter setting” is canceled. Any parameter changes performed are not accepted.
Display switches back to “Autoscroll” mode
Button functions in mode “Parameter setting”
Increases the set value
Reduces the set value
Confirms the set value
Switches to the next screen
Electronic components
6.10 Alphanumeric display of ETU45WT and ETU47WT
3WT
76 Operating Instructions, 12/2018, 9239 0020 176 06
Mode "Contrast setting"
In this mode, the contrast of the display can be adjusted.
To access “Contrast setting” mode, press the following button(s):
In “Autoscroll” mode
Screens displayed in the mode “Contrast setting”
Contrast setting
The longer the bar, the higher the contrast
Button functions in mode “Contrast setting”
Increases the contrast
Reduces the contrast
Accepts the contrast, switch to the “Autoscroll” mode
Screen "Tripping info"
In this mode, there is an automatic change as soon as there is a tripping, provided that an
external 24 V DC voltage supply has been connected.
Screens displayed in the mode “Tripping info”
Tripping type
Phase affected
XX may be: L, S, I, G, N
YY may be: L1, L2, L3, N
Button functions in the mode “Tripping info”
Display of maintenance instructions If pressed again:Return to the
mode “Tripping info”
Press CLEAR-button
Switches to “Autoscroll” mode
Electronic components
6.10 Alphanumeric display of ETU45WT and ETU47WT
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 77
Screen "Display parameter changes"
The display automatically switches to this mode when a parameter has been changed via
the rotary coding switches, provided an external 24 V DC voltage supply has been
connected.
Screens displayed in mode “Display parameter changes”
Display of the changed value N
Technical data with values and units that can be displayed in screen 1
Changed data
Displayed values
Unit
LT pickup value in primary amperes
ST pickup value in primary amperes
IN pickup value in primary amperes
GF pickup value in primary amperes
GF alarm pickup value in primary amperes
GF delay: 100 200 300 400 500
GF I2t delay: 100 200 300 400 500
LT I2t delay: 2 3.5 5.5 8 10 14 17 21 35 30
ST delay: 20 100 200 300 400
100 200 300 400
ON OFF
A
A
A
A
A
ms
ms
s
ms
ms
..
IR Current for overload tripping
I
SD
Current for short-time delayed short-circuit tripping
Ii
Current for instantaneous short-circuit tripping
Ig Current for ground-fault protection tripping (this is only displayed if there is an ground-fault
protection module available)
Ig alarm Response current for ground-fault protection alarm indicator (this is only displayed if a
ground-fault protection module is installed)
tg Delay time for ground-fault protection (this is only displayed if a ground-fault protection
module is installed)
I2tg Inverse-time delay (I2t-dependent) of ground-fault protection (this is only displayed if a
ground-fault protection module is installed)
I
2
t
R
Inverse-time delay (I
2
t-dependent) for overload tripping
tSD
Delay time of short-circuit tripping
I
2
t
SD
Inverse-time delay (I
2
t-dependent) for short-circuit tripping
th mem
Indicates whether thermal memory is on / off
Button functions in mode “Display parameter changes”
The changed value is displayed for 4 seconds. The display then switches back to the
previous mode.
Electronic components
6.11 Communication
3WT
78 Operating Instructions, 12/2018, 9239 0020 176 06
6.11
Communication
The figure below shows how COM16WT contacts for ON and OFF must be wired to allow
switching the beaker on/off. This figure only applies for ON and OFF solenoids with DC 24 V!
Wiring of COM16WT at DC 24 V
CAUTION
The external power supply, used for electronic components, shall not be used to supply the
motor operating mechanism!
Electronic components
6.11 Communication
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 79
The figure below shows the wiring if contacts are installed with voltages not equal to
DC 24 V.
● Coupling relays must be used.
● If F1 is not used for switching off, alternative F2 can be used.
Wiring of COM16WT at voltage not equal to DC 24 V
Electronic components
6.12 Breaker Status Sensor (BSSWT)
3WT
80 Operating Instructions, 12/2018, 9239 0020 176 06
6.12
Breaker Status Sensor (BSSWT)
For collecting Circuit breaker status information via signaling -switches and transmitting
these data to the
Cubicle
BUS.
①
BSSWT module
②
Microswitches connecting cable for S40, S41, S44
③
Microswitches connecting cable for S43, S45
④
BSSWT connecting cable for CubicleBUS
Electronic components
6.12 Breaker Status Sensor (BSSWT)
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 81
Signaling switches for BSSWT
①
Signaling switch spring charged S41
⑥
Signaling switch disconnected position S48
②
Signaling switch ready-to-close S40
⑦
Signaling switch S43 auxiliary release (F2)
③
Trip signaling switch S45
⑧
Signaling switch S43 auxiliary release (F1/F3/F8)
④
Signaling switch connected position S46
⑨
Signaling switch ON-OFF position S44
⑤
Signaling switch test position S47
Note
Signaling switch S43 for auxiliary release (F2) only available when there is no auxiliary
release F1/F3/F8 existed.
Article No. for spare part
Description
Article No.
BSSWT module
3WT9844-0AT00
Electronic components
6.13 COM16WT module
3WT
82 Operating Instructions, 12/2018, 9239 0020 176 06
6.13
COM16WT module
Interface adapter for:
● converting
Cubicle
BUS signals to Modbus signals and vice versa
● on draw-out Circuit breakers: detecting the Circuit breaker position in the guide frame with
the signaling switches S46, S47 and S48, and emitting the corresponding signals on the
Cubicle
BUS and the Modbus.
● providing special functions by additional inputs and outputs (e.g. to control the Circuit
breaker and for parameterization)
Further Information is given in the manual “3WT Circuit breakers with communication
capability - Modbus”.
Note
This is a product fo
r environment A. In residential environment this device can cause
unwanted radio interferences. In this case the user can be put in charge to perform special
measures.
View
①
Connection terminals for additional inputs and outputs to provide special functions
②
SUB-D plug, 9-pole, for Modbus connection
③
CubicleBUS LED
④
Modbus-LED
⑤
Connecting cables to hand plug X300
⑥
Cubicle
BUS connection for connecting external
Cubicle
BUS-modules or for the terminating
resistor
Electronic components
6.13 COM16WT module
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 83
Indications
LED
Indication
Significance
Modbus
Off
No voltage at COM16WT
Green Modbus communication operating
Red
Bus fault or bus not responding
Cubicle
BUS
Off
No CubicleBUS-modules found
Green
CubicleBUS communication operating
Green flashing
Cubicle
BUS participant found, but
Cubicle
BUS connection inside
Circuit breaker disturbed
Red
CubicleBUS faulty
Fitting COM16WT module on the guide frame
● Switch off open button and discharge the storage spring.
● Pull the breaker into maintenance position
See chapter Preparatory work (Page 102)
S46, S47 and S48: Signaling switches for detecting the Circuit breaker position in the guide
frame and transfer to Modbus and
Cubicle
BUS.
Connecting wires
See chapter Overall circuit diagram (Page 247)
Note
If necessary missing auxiliary terminals may be retrofitted (receptacle, auxiliary connectors
and sliding contact module for guide frames).
- See chapter Connecting the auxiliary
conductor
(Page 40)
Electronic components
6.13 COM16WT module
3WT
84 Operating Instructions, 12/2018, 9239 0020 176 06
①
Hand plug X300
②
Connecting cable to first external CubicleBUS-module or terminating resistor
③
Connecting cable to hand plug X300
Designation
Assignment
Terminal
314
CubicleBUS -
X300.14
313
CubicleBUS +
X300.13
312
24 V DC +
X300.12
311
24 V DC GND
X300.11
Connections for additional inputs and outputs
Further information about the application of these inputs and outputs is given in the manual
“3WT Circuit breakers with communication capability – Modbus”.
Article No. for spare part
Description
Article No.
COM16WT
3WT9844-1AT00
Electronic components
6.14 Metering function
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 85
6.14
Metering function
Trip unit ETU45WT and ETU47WT can be equipped with a metering function.
In addition to the values for the currents, the metering function provides data on voltages,
powers, energy values, power factors and frequency through the
Cubicle
BUS, for further
processing.
This data can be shown on the display of the trip unit, transmitted to the Modbus through the
COM16WT module and transferred to the outputs of external
Cubicle
BUS-modules. Based
on these data, conclusions can be drawn about the condition of the power system. To use
the metering function an external 24 V auxiliary voltage supply is required.
The measurement accuracy of the voltage values can only be guaranteed by connecting the
protective earth (PE) with the 24 V-GND ("-") of the external power supply voltage of the
circuit breaker. The connection should be made directly on the output of the power supply
and with at minimum 1.5 mm2 of cable.
Furthermore, it is necessary to connect the N-conductor (at 3-poles breaker) for a proper
voltage measurement.
Please see chapter External voltage supply (Page 88)
Measured parameter
Accuracy
1)
Currents I
L1
, I
L2
, I
L3
, I
N
± 1 %
Ground-fault current Ig
(Measurement with external ground-fault transformer)
± 5 %
Line-to-line voltage U
L12
, U
L23
, U
L31
± 1 %
Neutral point voltages UL1N, UL2N, UL3N
± 1 %
Present average of line-to-line voltage U
avgD
± 1 %
Present average of neutral point voltages UavgY
± 1 %
Apparent power S
L1
, S
L2
, S
L3
± 2%
Total apparent power
± 2 %
Active power P
L1
, P
L2
, P
L3
± 3 % @ cosφ > 0.6
Total active power
± 3 % @ cosφ > 0.6
Reactive power Q
L1
, Q
L2
, Q
L3
± 4 % @ cosφ > 0.6
Total reactive power
± 4 % @ cosφ > 0.6
Power factors cosφ
L1
, cosφ
L2
, cosφ
L3
,
± 0.04
Power factor total cosφavg
± 0.04
Long-time average of currents I
L1
, I
L2
, I
L3
± 1 %
Long-time average of 3-phase current
± 1 %
Long-time average of active power in L
1
, L
2
, L
3
± 3 % @ cosφ > 0.6
Long-time average of active power 3-phase
± 3 % @ cosφ > 0.6
Long-time average of apparent power in L
1
, L
2
, L
3
± 2 %
Long-time average of apparent power 3-phase
± 2 %
Long-time average of reactive power 3-phase ± 4 % @ cosφ > 0.6
Energy consumed
± 3 %
Energy delivered ± 3 %
Reactive energy consumed
± 4 %
Electronic components
6.14 Metering function
3WT
86 Operating Instructions, 12/2018, 9239 0020 176 06
Reactive energy delivered ± 4 %
Frequency
± 0.1 Hz
Distortion factor of current and voltage ± 3 % , up to 29th harmonic
Phase unbalance of current and voltage
2)
± 1 %
1) Definition of accuracy:
± ( x % of measuring range + 2 LSD (Least Significant Digit) for one year after calibration
Reference condition:
Input current I: In max ± 1%
Input voltage U: Un ± 1%
Frequency f: 50 Hz
Power factor: cosφ = 1
Waveform: sine, harmonic distortion < 5% symmetrical load
Ambient temperature: 35 °C ± 5 °C
Auxiliary voltage: DC 24 V according DIN 19240 / EN 61131
Warm-up time: 2 hours
External fields: no
Metering range:
Current: 0.2 ... 1.2 In max
Voltage: 0.8 ... 1.2 Un
2) IEC-Definition:
Ratio of the largest difference between the phases and the most heavily loaded phase.
Metering function
In addition to the basic functions, the metering function offers:
● two independent waveform memories
● harmonic analysis
The two independent waveform memories can be used to analyse the current and voltage
values at the time of the event.
If the waveform memories are programmed to “recording” (standard setting), continuous
recording takes place until a previously defined event occurs. Then, the recording is stopped,
and the current or voltage waveforms at the time of the event can be observed through a
visual display (graphical LCD, laptop or PC).
The time window is one second; the resolution is 1649 values/second.
The values that can be selected for one of the waveform memories are:
Settings for waveform buffers memory
Currents
I
L1
, I
L2
, I
L3
, I
LN
, I
g
Voltages
UL1, UL2, UL3
The waveform memories can also be started or stopped individually through the
communication channels (Modbus,
Cubicle
BUS).
The waveform memories can be parameterized via:
● the test socket with the TD400
● the Modbus with a PC and the PC-software “powerconfig”
Electronic components
6.14 Metering function
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 87
Switchgear insulation test
The following applies for switchgears with more than 4 circuit breakers with internal voltage
tap: prior to the insulation test of the switchgear the internal voltage converters must each be
disconnected from the metering function.
WARNING
Always de-energize and ground equipment before working on this equipment.
- Switch off and discharge the storage spring
- Move draw-out circuit breaker to maintenance position
- Remove front panel
- Disconnect X50 at the metering function
After the insulation test the connecting cable at X50 has to be connected again.
- Connect plug X50 to meterring function again
- Attach front panel
Then check the measured voltage values of the metering function by connecting line voltage
in the switchgear.
Article No. for spare part
Description
Article No.
Metering function
3WT9844-5AT00
Electronic components
6.15 External voltage supply
3WT
88 Operating Instructions, 12/2018, 9239 0020 176 06
6.15
External voltage supply
The basic functions of the electronic overcurrent releases do not require auxiliary power
supply.
To use the extended functions of the overcurrent releases ETU45WT requiring data
exchange through the
Cubicle
BUS, an external 24 V DC voltage supply must be connected.
Connection
Connection to hand plug X300.
Requirements
The external voltage supply with 24 V DC must comply at least with the requirements of DIN
19240 / EN 61131. To prevent the 3WT system from EMC interferences, it is recommended
to use a power supply of protection class II.
To supply power to a circuit breaker equipped with the maximum number of external
Cubicle
BUS-modules possible, the Siemens power supply unit mentioned below can be
used. If a second circuit breaker must be fed, a second power supply unit will be necessary,
too.
When using voltage supply units from other manufacturers, the following conditions must be
fulfilled:
● Primary-switched-mode power supply unit
● 24 V DC, ± 3 %
EMC according for 24 V power supply:
IEC61000-4-4: 4 kV on main side;
IEC61000-4-5: 4 kV line-to-earth, 2 kV line-to-line.
Electronic components
6.15 External voltage supply
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 89
Article number
Power supply
Article No.
LOGO! Power, Input: AC 100-240 V, output 24 V DC / 4 A
6EP3333-6SB00-0AY0
CAUTION
The external power supply, used for electronic components, shall not be used to supply the
motor operating mechanism!
Electronic components
6.15 External voltage supply
3WT
90 Operating Instructions, 12/2018, 9239 0020 176 06
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 91
Auxiliary release and auxiliary switches
7
WARNING
May result in death or serious injury.
Discharge storage spring before removing barriers / covers. - See chapter Preparatory work
(Page 102)
7.1
Overview
Mounting location
①
Closing coil Y1
②
2
nd
shunt release F2
③
1st shunt release F1
or undervoltage release "r" F3
or undervoltage release "rc" F8
④
1
st
auxiliary switches 2NO + 2NC
⑤
2nd auxiliary switches 2CO
or 2nd auxiliary switches 2NO + 2NC
or 2nd auxiliary switches 3NO + 1NC
or 2
nd
auxiliary switches 4NO
See chapter Terminal diagrams (Page 250)
Auxiliary release and auxiliary switches
7.1 Overview
3WT
92 Operating Instructions, 12/2018, 9239 0020 176 06
Article No.
Description
Article No.
Closing coil Y1; 2nd shunt
release F2; 1st shunt release
F1
DC 24 V
3WT9851-1JB00
DC 110 ... 125 V; AC 50/60 Hz 110 ... 127 V 3WT9851-1JH00
DC 220 ... 250 V; AC 50/60 Hz 220 ... 240 V
3WT9851-1JK00
Undervoltage release "r" F3
DC 24 V
3WT9853-1JB00
DC 110 ... 125 V; AC 50/60 Hz 110 ... 127 V
3WT9853-1JH00
DC 220 ... 250 V; AC 50/60 Hz 220 ... 240 V
3WT9853-1JK00
AC 50/60 Hz 380 ... 415 V
3WT9853-1JM00
Undervoltage release "rc" F8
DC 110 ... 125 V; AC 50/60 Hz 110 ... 127 V
3WT9855-1JH00
DC 220 ... 250 V; AC 50/60 Hz 220 ... 240 V
3WT9855-1JK00
AC 50/60 Hz 380 ... 415 V
3WT9855-1JM00
2
nd
auxiliary
switches 2CO
3WT9816-1CE00
2
nd
auxiliary switches 2NO + 2NC
3WT9816-1CD00
2
nd
auxiliary switches 3NO +1NC
3WT9816-1CF00
2
nd
auxiliary switches 4NO
3WT9816-1CG00
Auxiliary release and auxiliary switches
7.2 Setting the delay time of the undervoltage release
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 93
7.2
Setting the delay time of the undervoltage release
Preparatory work
● Opening the Circuit breaker and discharging the stored energy springs
● Disconnect auxiliary circuits
● Pull Circuit breaker to maintenance position and remove
See chapter Preparatory work (Page 102)
● Removing the operating device
See chapter Removing the operating device (Page 127)
Setting
Undervoltage release "r" F3
1.
Remove the cap.
2.
Set the jumper.
3.
Re-attach the cap.
Undervoltage release "rc" F8
S1
Select the range.
S2
Set the delay time t
d
.
Final work
- Install front panel
- Fit auxiliary connectors
- Connect wires to auxiliary connector
- Move the draw-out Circuit breaker into the test position
Auxiliary release and auxiliary switches
7.2 Setting the delay time of the undervoltage release
3WT
94 Operating Instructions, 12/2018, 9239 0020 176 06
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 95
Commissioning
8
8.1
Charging the stored-energy spring mechanism
WARNING
Can cause injury.
When the Circuit breaker has been removed from the system with an unloaded stored-
energy spring mechanism, it must be placed on a stable surface (e.g. on a workbench
during maintenance).
8.1.1
Manual charging
Pump movements 5x
Stored-energy spring mechanism charged
Note
To charge the stored
-energy spring mechan
ism, grasp the charging lever securely and move
it as far as it will go. Make sure that each movement is as smooth as possible. The fifth
stroke must be made as far and as smoothly as the previous four strokes, even though the
force required to actuate the
lever increases considerably. Once the stored-energy spring
mechanism has been fully charged, the charging lever can be moved without resistance.
Commissioning
8.1 Charging the stored-energy spring mechanism
3WT
96 Operating Instructions, 12/2018, 9239 0020 176 06
F
Actuating force
n
Number of strokes
(1)
Stored-energy spring mechanism charged
8.1.2
By means of motorized operating mechanism
This occurs automatically once the control volt-
age has been applied (the motorized operating
mechanism is shut down as soon as charging is
complete).
Stored-energy spring mechanism charged
Article No.
Description
Article No.
Motorized operating mechanism, DC 24 V
3WT9832-1JB00
Motorized operating mechanism, DC 110 ... 125 V; AC 50/60 Hz 110 ... 127 V 3WT9832-1JH00
Motorized operating mechanism, DC 220 ... 250 V; AC 50/60 Hz 220 ... 240 V
3WT9832-1JK00
Commissioning
8.2 Preparing for operation
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 97
8.2
Preparing for operation
Commissioning checklist
Arc chutes attached
✓
Circuit breaker is OFF ✓
Overcurrent release is installed and RESET pressed
✓
Operating values on the overcurrent release are set ✓
Auxiliary and control voltages are applied
(for rated values, see the rating plate)
✓
The main conducting paths are de-energized
✓
Cabinet door is closed
✓
Stored-energy spring mechanism is charged
✓
Withdrawable Circuit breaker in connected position
✓
Conditions (depending on version)
Undervoltage release
Excited
✓
Shunt release
Not excited
✓
Electrical closing lockout
Not excited
✓
Mechanical reclosing lockout
Set to RESET
✓
Electrical interlocking for closing solenoid
Canceled
✓
Interlock
Not active
✓
Display:
"ready to close"
✓
Note
1. The Circuit breaker must only be closed when the overcurrent release has been installed
(with the exception of non
-automatic Circuit breakers).
2. Never remove overcurrent releases under load since this can damage the ov
ercurrent
release / current transformer.
Commissioning
8.3 Closing operation
3WT
98 Operating Instructions, 12/2018, 9239 0020 176 06
8.3
Closing operation
Mechanical closing
Switching position indicator
Store status indicator
8.4
Opening operation
On the Circuit breaker
Overcurrent
Switching position indicator
Commissioning
8.5 Recommissioning after opening operation by means of overcurrent release
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 99
8.5
Recommissioning after opening operation by means of overcurrent
release
Ready-to-close indicator = □
(not ready)
Identify and rectify
the cause.
After short-circuit trip,
check the Circuit breaker
for any damage.
Open the transparent cover and reset
the reclosing lockout.
Press RESET for tripped signaling,
commission as described above.
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 101
Maintenance
9
DANGER
Hazardous voltage
During operation, certain Circuit breaker components are subject to hazardous voltages or
spring force. If you come into contact with live components, this can result in death or
serious injury.
Maintenance must only be carried out by authorized personnel.
Maintenance
9.1 Preparatory work
3WT
102 Operating Instructions, 12/2018, 9239 0020 176 06
9.1
Preparatory work
Opening the Circuit breaker and discharging the stored-energy spring mechanism
Possible status:
Actuating sequence:
Circuit breaker CLOSED
Stored-energy spring mechanism discharged
1. Open
Open Circuit breaker
Stored-energy spring mechanism charged
1. Closed
2. Open
Circuit breaker CLOSED
Stored-energy spring mechanism charged
1. Open
2. Closed
3. Open
Indications final status:
Maintenance
9.1 Preparatory work
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 103
Disconnect auxiliary circuits
Fixed-mounted Circuit breaker
Remove the manual connector and take out the Circuit breaker.
To remove the manual connector(s), push them up. Make sure that the connected cables are
not bent.
Withdrawable Circuit breaker
Racking to the disconnection position
Maintenance
9.2 Checking the arc chutes
3WT
104 Operating Instructions, 12/2018, 9239 0020 176 06
Pull Circuit breaker to maintenance position and remove
1.
Set the Circuit breaker to the maintenance position
2.
Remove the Circuit breaker.
Set the Circuit breaker to the maintenance position and remove from the system.
9.2
Checking the arc chutes
● Every 12 months or after 1000 switching operations
● After serious shutdowns
Remove the arc chutes.
If severe wear and tear is present (e.g. burns on the arc splitters), replace the arc chutes.
Maintenance
9.3 Checking the wear on the contacts
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 105
9.3
Checking the wear on the contacts
● Every 12 months or after 1000 switching operations
● After serious shutdowns
Remove the arc chutes. Close the Circuit breaker. Carry out a visual check of the open Circuit
breaker.
9.4
Replacing the conducting paths
DANGER
Hazardous voltage!
Hazardous stored-energy spring mechanism
Before starting work, disconnect the device from the supply and ensure that it cannot be
switched on. Only carry out work on the device when the Circuit breaker is open and the
stored-energy spring mechanism is discharged. Failure to do so can result in death, severe
injury, or substantial material damage.
The devices must be installed and mounted by authorized personnel only.
Maintenance
9.4 Replacing the conducting paths
3WT
106 Operating Instructions, 12/2018, 9239 0020 176 06
Check the contents of the packaging
Frame size I
Frame size II
①
Contact carrier, cpl.
1x
⑥
Contact carrier, cpl.
1x
②
Conducting path, fixed
1x
⑦
Conducting path, fixed
1x
③
Coupling bolt
1x
⑧
Coupling bolt
1x
④
Cylinder-head screw M6 x 30 DIN 912
4x
⑨
Cylinder-head screw M8 x 50 DIN 912
4x
⑤
Strain washer 6 DIN 6796
4x
⑩
Strain washer 8 DIN 6796
4x
Note:
The shape of the connection bars on the contact carriers ① and ⑥ and on the conducting
paths ② and ⑦ varies depending on the version you have ordered. The
installation/mounting procedure is the same for all versions.
Unscrew arc chutes
● Remove the fixing screws ⑪ for the arc chutes ⑫.
● Lift off the arc chutes.
Maintenance
9.4 Replacing the conducting paths
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 107
Disconnecting the contact carriers (frame sizes I and II)
● Loosen the locking bolt ⑬ (do not remove completely).
● Press out the coupling bolt ③ or ⑧ by means of a screwdriver (as shown).
Note:
With frame size II, the locking bolt ⑬ with cover must be removed completely.
Maintenance
9.4 Replacing the conducting paths
3WT
108 Operating Instructions, 12/2018, 9239 0020 176 06
Removing the rear housing panel
Frame size I
Frame size II
Frame sizes I and II
● Remove the cylinder-head screws ⑭.
● Unscrew the countersunk head screws ⑰ on the support bracket ⑮ of the rear panel ⑯.
● Loosen the countersunk head screws ⑰ of the support bracket ⑮ (do not remove
completely).
● Open the rear panel of the Circuit breaker ⑯ (as shown).
Maintenance
9.4 Replacing the conducting paths
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 109
Removing the insulation (frame size I)
● Lift the contact carrier ① up.
● Pull the insulation ⑱ forward (push the side walls of the insulation ⑱ outward slightly).
Removing the contact carriers (frame sizes I and II)
● Lift the contact carrier ① or ⑥ up.
● Unscrew the cylinder-head screw ④ or ⑨ with strain washer ⑤ or ⑩.
● Remove the contact carrier ① or ⑥ from the rear housing panel ⑯ (as shown).
Maintenance
9.4 Replacing the conducting paths
3WT
110 Operating Instructions, 12/2018, 9239 0020 176 06
Removing the conducting paths (frame sizes I and II)
● Unscrew the cylinder-head screws ④ or ⑨ with strain washers ⑤ or ⑩.
● Remove the conducting path ② or ⑦ from the rear housing panel ⑯ (as shown).
Maintenance
9.4 Replacing the conducting paths
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 111
Installing the conducting path (frame sizes I and II)
● Push the conducting path ② or ⑦ into the rear housing panel ⑯ from above.
● Push the spacer ⑲ or ⑳ into the rear housing panel ⑯ from below as far as it will go.
● Secure the conducting path ② or ⑦ and spacer ⑲ or ⑳ with cylinder-head screws ④
or ⑨ and strain washers ⑤ or ⑩ to the rear housing panel ⑯ (tighten by hand only).
Note:
The spacer (19 or 20) is not required for versions other than 3WT9821-0AA00.
Maintenance
9.4 Replacing the conducting paths
3WT
112 Operating Instructions, 12/2018, 9239 0020 176 06
Attaching the spacer (frame size I)
● Attach the spacer ⑳ to the contact carrier ① (as shown).
Note:
The spacer ⑳ is not required for versions other than 3WT9821-0AA00.
Installing the contact carriers (frame sizes I and II)
● Insert the contact carrier ① or ⑥ (if necessary, with spacer ⑳) into the rear housing
panel ⑯ and secure with cylinder-head screws ④ or ⑨ and strain washers ⑤ or ⑩
(tightening torque: 8 ± 1 Nm ④; 12 ± 1 Nm ⑨)
Maintenance
9.4 Replacing the conducting paths
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 113
Installing the insulation (frame size I)
● Lift the contact carrier ① up.
● Attach the insulation ⑱ to the contact carrier ① (must audibly engage).
Maintenance
9.4 Replacing the conducting paths
3WT
114 Operating Instructions, 12/2018, 9239 0020 176 06
Removing the rear housing panel
Frame size I
Frame size II
Rear housing panel: frame sizes I and II
● Place the rear housing panel ⑯ up against the housing. When doing so, make sure
that you do not trap any cables.
● Secure the support bracket ⑮ and housing or rear housing panel ⑯ by means of
countersunk head screws ⑰ (tightening torque: 6 ± 1 Nm).
● Secure the cylinder-head screws ⑭ (tightening torque: 10 ± 1 Nm).
Maintenance
9.4 Replacing the conducting paths
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 115
Connecting the contact carriers (frame sizes I and II)
● Press the contact carrier ① or ⑥ toward the coupling clips (as shown). When doing
so, make sure that the coupling clips fully accommodate the contact carrier ① or ⑥.
● Insert the coupling bolt as shown (③ or ⑧) by means of a screwdriver (to the right).
● Secure the coupling bolt ③ or ⑧ by means of a locking bolt ⑬ (tightening torque:
2 ± 0.3 Nm).
Note:
With frame size II as of 09/95, the locking bolt ⑬ (with cover) must be screwed in again
(tightening torque: 2 ± 0.3 Nm).
Maintenance
9.4 Replacing the conducting paths
3WT
116 Operating Instructions, 12/2018, 9239 0020 176 06
Final installation of the conducting path (frame sizes I and II)
CAUTION
Hazardous stored-energy spring mechanism
● Charge the stored-energy spring mechanism and close the Circuit breaker.
● Close the Circuit breaker, making sure that you take the necessary precautions.
● Secure the cylinder-head screws ④ or ⑨ with strain washers ⑤ or ⑩ (tightening
torque: frame size I 8 ± 1 Nm, frame size II 12 ± 1 Nm)
Maintenance
9.4 Replacing the conducting paths
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 117
Attaching the arc chutes
● Attach the arc chutes ⑫.
● Secure the arc chutes ⑫ by means of fixing screws ⑪.
Functional test
Mechanical functional test
● Charge the stored-energy spring mechanism manually.
● Close.
● Open.
● Check the indicator for wear on the contacts again.
Maintenance
9.5 Internal self-test of the overcurrent release function
3WT
118 Operating Instructions, 12/2018, 9239 0020 176 06
9.5
Internal self-test of the overcurrent release function
For commissioning and checking the function of the device.
Requirements
● The release is activated by means of:
operational current
● The current is not in the overload range
→ for indicators, see (Indicators on the overcurrent release (Page 59))
Internal self-test of Circuit breaker without tripping operation
Normal operation of the Circuit breaker is not affected.
The test can be terminated at any point with "CLEAR".
Start the self-test.
Maintenance
9.5 Internal self-test of the overcurrent release function
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 119
Self-test procedure
Maintenance
9.6 Internal self-test of Circuit breaker with tripping operation
3WT
120 Operating Instructions, 12/2018, 9239 0020 176 06
9.6
Internal self-test of Circuit breaker with tripping operation
Note
The internal self
-test with tripping operation must only be carried out when the downstream
circuits have been shut down.
The test can be terminated at any point with "CLEAR".
Start the self-test.
Maintenance
9.7 Replacing the overcurrent release
3WT
122 Operating Instructions, 12/2018, 9239 0020 176 06
9.7
Replacing the overcurrent release
Removal
See Removing the operating device (Page 127)
NOTICE
Retrofitting for the overcurrent release is only permissible by Siemens customer service
specialists.
Removal
Note the current overcurrent release settings.
Remove the nuts and washers.
Note
Carefully pull the release forward.
Make sure that you do
not damage the cable harness.
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 125
Accessories
10
10.1
Accessories
Version specific
Operator panel
Circuit breaker, operator panel removed
For closing operation
①
Motorized operating mechanism -M
②
Closing solenoid -Y1
For opening operation
③
Shunt release -F1
④
Shunt release -F2
⑤
Tripping solenoid -F5
For monitoring
⑥
Auxiliary switch for switching position indication -S1 ... S6, S60, S61
⑦
Ready-to-close signaling switch -S7
⑨
Undervoltage release -F3
⑨
Undervoltage release with delay -F8
⑩
Overcurrent release -A1
Accessories
10.2 Accessories - general
3WT
126 Operating Instructions, 12/2018, 9239 0020 176 06
For interlocking
⑬
Reclosing lockout -F5 with tripped signaling contact -S11
⑮
Key-operated pushbutton "OFF"
⑯ Key-operated pushbutton "ON" (mechanical)
10.2
Accessories - general
The following sections describe the accessories available for 3WT. In some cases, the front
cover and manual connector may have to be removed. If a withdrawable Circuit breaker is
used, it must be set to the maintenance position. The different activities are described in the
following sections.
DANGER
Hazardous voltage
Hazardous stored-energy spring mechanism
Before starting work, the device must be disconnected from the supply and protected
against reactivation.
Only carry out work on the device when the Circuit breaker is shut down and the stored-
energy spring mechanism is discharged.
Failure to do so can result in death, severe injury, or substantial material damage.
The devices must be installed and mounted by qualified, authorized personnel only.
Accessories
10.2 Accessories - general
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 127
10.2.1
Removing the operating device
Preparatory work
● Opening the Circuit breaker and discharging the stored energy springs
● Disconnect auxiliary circuits
● Pull Circuit breaker to maintenance position and remove
See chapter Preparatory work (Page 102)
Removing the operator panel
Note
For withdrawable Circuit breakers: first close the racking hole, then remove the operator
panel.
● Remove the fixing screws ③ (2 x), tool: cross-tip screwdriver (size 3).
● Move the charging lever ② until you feel resistance.
● Remove the front cover ① by lifting it up and forward.
● Set down the front cover so that its inside is facing down.
Accessories
10.2 Accessories - general
3WT
128 Operating Instructions, 12/2018, 9239 0020 176 06
10.2.2
Installing the operating device
Note
For withdrawable Circuit breakers: first close the racking hole, then attach the
operator
panel.
Attaching the operator panel
● Attach the front cover (operator panel) by following the above steps in reverse order.
When doing so, push the clamping lever forward until you feel resistance and attach the
front cover from above. The fixing screws are tightened to 5 Nm.
Final steps
● Fixed-mounted Circuit breaker: connect the manual connector. When doing so, make
sure that you do not trap any cables.
● Withdrawable Circuit breaker: rack to the test position (from disconnected position to test
position: approx. 22 rotations of the racking handle).
Accessories
10.3 Hand-held test device
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 129
10.3
Hand-held test device
The hand-held test device is used to check that the following devices function properly:
● Overcurrent release
● Energy and current transformer
● Tripping solenoid F5
● Measured value display
Article No.
Description
Article No.
Manual function tester for electronic trip unit
3WL9111-0AT32-0AA0
View
①
LED for indicating the operating voltage
②
Control keys
③
6 LEDs for indicating the test results
Accessories
10.3 Hand-held test device
3WT
130 Operating Instructions, 12/2018, 9239 0020 176 06
Preparatory work
● Open and disconnect the Circuit breaker.
● Note the setting values of the overcurrent release.
● Deactivate ground fault protection (if available) on the overcurrent release (Ig = OFF).
● Setting value IR = 1.0 In
● Remove the cover cap from test socket X25 on the ETU.
CAUTION
If the hand-held test device is used while the Circuit breaker is closed, this can cause false
tripping and destroy the hand-held test device.
Connection
Note
Malfunctions and incorrect test results can occur if the connection sequence is not followed.
①
Test socket on the overcurrent release
②
Cable with SUB D (40 pole) (hand-held test device) to plug connector (40 pole)
③
Power supply
④
Hand-held test device
Accessories
10.3 Hand-held test device
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 131
Power supply
The hand-held test device is supplied from an AC voltage network:
● 220 ... 240 V 50/60 Hz
● 110 ... 125 V 50/60 Hz
Factory setting: 220 ... 240 V
The selector switch is located on the circuit board within the hand-held test device.
Switching the line voltage
Operation
When the power supply is connected, the status test starts automatically with the querying of
different overcurrent release components and parameters. If the status test is successful, the
"ETU STATUS" LED lights up (continuous light). If the test is not successful, this means that
the overcurrent release or one of its components is either defective or has not been installed.
Indicator
Meaning
1 x short, pause
Test device defective
2 x short, pause
Overcurrent release defective
4 x short, pause
• Parameters set incorrectly
• Current transformer incorrectly terminated
5 x short, pause
• Tripping solenoid F5 incorrectly connected or defective
• Overcurrent release defective
The status test can be repeated at any time by means of the "START" button (press for at
least 3 s). The status test can also be carried out on overcurrent releases that have already
been activated. In this case, note that the "ETU STATUS" LED may flash twice briefly when
the result of the status test is signaled even if no fault is present. To be on the safe side, the
overcurrent release should be deactivated and the status test repeated.
Accessories
10.3 Hand-held test device
3WT
132 Operating Instructions, 12/2018, 9239 0020 176 06
Testing the transformers
To test the energy and current transformers, press the "START" button (for less than 2 s).
If the LED lights up, this means that the transformer is functioning properly. If the LED
flashes, the transformer is either not installed, incorrectly connected, or defective.
Result of the N transformer test
If the LED flashes (1 s ON, 1 s OFF), this signals a fault with the measuring transformer of
the neutral conductor. This might be because a measuring transformer has not been
installed (e.g. no external neutral conductor transformer connected), or it has been
connected incorrectly, or is defective.
If the LED starts flashing quickly (0.5 s ON, 0.5 s OFF), this signals a fault with the energy
transformer of the neutral conductor. This might be because an energy transformer has not
been installed (e.g. when an external neutral conductor transformer is connected), or it has
been connected incorrectly, or is defective.
Testing the tripping function
● Charge the stored-energy spring mechanism manually.
● Close the Circuit breaker
To test the tripping function, press either "L", "S", "I", "N", or "G".
The Circuit breaker trips after the set delay time plus 2 seconds. The reason for tripping can
be queried via the "QUERY" button on the overcurrent release. To do so, the overcurrent
release must have been active for at least 20 minutes. If the Circuit breaker does not trip, the
overcurrent release is either not equipped with the relevant protection function or is
defective.
Testing the measured value display
After the tripping test, the capability of the system to store the reasons for tripping must be
tested via the "QUERY" button when the ETU is deactivated.
To test the measured value display, press "I" and "N" simultaneously.
Over a period of 30 s, a current is simulated in L1, L2, L3, N, and G consecutively via the
measuring transformer. The LEDs of the corresponding transformers flash. The test is
considered successful when current is displayed at the relevant point.
Accessories
10.3 Hand-held test device
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 133
Activating the overcurrent release
To activate the overcurrent release, press "N" and "G" simultaneously.
The overcurrent release remains active until you press a different button.
This function can be used, for example, to test the signaling of the "T.U. Error" LED if the
status test ended with the fault "Overcurrent release defective".
Subsequent steps
● Restore the setting values you noted down.
● Place the cover cap on test socket X25.
Accessories
10.4 External transformer for neutral conductors
3WT
134 Operating Instructions, 12/2018, 9239 0020 176 06
10.4
External transformer for neutral conductors
10.4.1
External transformer for neutral conductors (for ETU37WT ... ETU47WT)
Note
The secondary connection cables from the neutral conductor transformer to the 3WT Circuit
breaker must be twisted.
Article No.
Description
Article No.
Current transformers for 3-pole Circuit breakers,
external neutral conductor with copper busbars
Size I
3WL9111-0AA31-0AA0
Size II
3WL9111-0AA32-0AA0
Current transformers for 3-pole Circuit breakers,
external neutral conductor without copper busbars
Size I
3WL9111-0AA21-0AA0
Size II
3WL9111-0AA22-0AA0
External transformer for neutral conductors
①
Version for plant
-side copper bar
②
Mounting bracket
③
M6 bolt with washers and nut
④
Version with copper connection elements
⑤
Connection P2
⑥
Connection P1
Accessories
10.4 External transformer for neutral conductors
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 135
Assignment of connections
This assignment ensures that the current in the Circuit breaker and external N transformer
flows in the same direction.
Note
Any missing auxiliary current connections (secondary disconnect, auxiliary supply connector,
sliding contact module for guide frame) can be retrofitted if required.
Remove jumper
X300.1
- X300.2
①
Main circuit
②
External N transformer
External transformer for neutral conductors - dimension drawings
Frame size I
Frame size II
Accessories
10.4 External transformer for neutral conductors
3WT
136 Operating Instructions, 12/2018, 9239 0020 176 06
10.4.2
External ground fault current transformer (only for ETU47WT)
The ground fault protection can use an external current transformer with the following properties:
- Primary current: 1200A
- Secondary current: 1A
- Accuracy: Class 1
- Breaker internal burden: 0.11 Ohm
Examples
3 pole Circuit breaker with current transformers "Y" connected with the star point of the
transformer grounded.
Connection
The external ground fault current transformer has to be connected to
X100.6 and X100.7.
Note
Any missing auxiliary current connections(secondary disconnect, auxiliary supply connector,
sliding contact module for guide frame) can be retrofitted if required)
Accessories
10.5 Retrofitting the internal N transformer
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 137
10.5
Retrofitting the internal N transformer
Article No.
Description
Article No.
Internal N transformer, Size I
3WT9843-1RE00
Internal N transformer, Size II 3WT9843-2RE00
Preparatory work
● Opening the Circuit breaker and discharging the stored energy springs
● Disconnect auxiliary circuits
● Pull Circuit breaker to maintenance position and remove
See chapter Preparatory work (Page 102)
Retrofitting the internal N transformer
● Remove the overcurrent release (for details, see Replacing the overcurrent release
(Page 122)).
1.
Unplug the connector from X24. Removing the cable harness from the overcurrent release
2. Remove the cable from terminals 1 & 2 of plug connector X300 and terminals 6 & 7 of plug con-
nector X100.
Accessories
10.5 Retrofitting the internal N transformer
3WT
138 Operating Instructions, 12/2018, 9239 0020 176 06
3.
Remove the screws.
4.
Remove the transformer covers on the N conductor connection and phase L3
5.
Installing the N transformer
6.
Insert the connector from the transformer connection into the cable compartment.
7.
Attach the transformer cover.
8.
Secure with screws (tightening torque: 8 ± 1 Nm).
Accessories
10.5 Retrofitting the internal N transformer
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 139
9.
Insert terminals into X100.6 & 7 of plug connector.
10.
Plug the connector into X24 of ETU.
11.
Pull out the connector of the N transformer in the Circuit breaker.
12. Plug the connector for the cable harness into the connector for the N transformer and place them
in the cable duct.
Subsequent steps
● Place the overcurrent release down in front of the Circuit breaker.
● Connecting the connectors on the overcurrent release
(X20, X21 and X28, etc.).
● Install the overcurrent release (for details, see Replacing the overcurrent release
(Page 122)).
Accessories
10.6 Counting mechanism
3WT
140 Operating Instructions, 12/2018, 9239 0020 176 06
10.6
Counting mechanism
Article No.
Description
Article No.
5-digit operating cycles counter
3WT9864-0CA00
Check the contents of the packaging
①
Counting mechanism, complete
1x
②
DIN 7991 countersunk screw M6 x 16 - 8
1x
③
Conical nut
1x
Preparatory work
● Opening the Circuit breaker and discharging the stored energy springs
● Disconnect auxiliary circuits
● Pull Circuit breaker to maintenance position and remove
See chapter Preparatory work (Page 102)
Removing the operating device
Removing the operating device (Page 127)
Accessories
10.6 Counting mechanism
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 141
Installing the counting mechanism
Installing the display window
● Place the operator panel onto a wooden board (make sure that it is in full contact with the
surface) near the outline to be cut out.
● Use a screwdriver to cut out the groove base from the pre-pressed groove.
Functional check
Charge the stored-energy spring mechanism and watch the counting mechanism. Once the
charging process is complete, the counting mechanism is incremented by one.
CAUTION
Taking the necessary precautions, close and open the Circuit breaker to discharge the
stored-energy spring mechanism.
Installing the operating device
Installing the operating device (Page 128)
Accessories
10.7 Castell lock
3WT
142 Operating Instructions, 12/2018, 9239 0020 176 06
10.7
Castell lock
Article No.
Description
Article No.
Mounting set for 3WT lock or CASTELL lock
3WT9863-6JE00
Check the contents of the packaging
Accessories
10.7 Castell lock
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 143
①
Housing
1x
②
Latch
1x
③
Seal
1x
④
Hexagon socket-head screw M 6x10 ISO 4017
1x
⑤
Spring washer A6 DIN 128
2x
⑥
Threaded pin M 4x8 ISO 7435
1x
⑦
Door slider (metal)
1x
⑧
Door slider spring
1x
⑨
Lock washer
2x
Note
The following components must be ordered from the relevant manufacturer: Castell lock
interlock, version FS2.
CAUTION
The plastic door slider (if have) must be replaced by the metal door slider in this package.
Preparatory work
● Opening the Circuit breaker and discharging the stored energy springs
● Disconnect auxiliary circuits
● Pull Circuit breaker to maintenance position and remove
See chapter Preparatory work (Page 102)
Removing the operating device
See chapter Removing the operating device (Page 127)
Accessories
10.7 Castell lock
3WT
144 Operating Instructions, 12/2018, 9239 0020 176 06
Installing the door slider (if not already installed)
● Remove the screws ⑩ for the electronic overcurrent release ⑪.
● Remove the electronic overcurrent release ⑪.
● Place the door slider spring ⑧ with the off-center eye in the side panel of the operating
mechanism ⑫.
● Place the door slider spring ⑧ with the center eye in the door slider ⑦ using a small
screwdriver (see diagram).
● Place the door slider ⑦ with the door slider spring ⑧ on the side panel of the operating
mechanism ⑫ and secure it by means of the lock washers ⑨.
● Install the electronic overcurrent release ⑪. When doing so, make sure that you do not
trap any cables.
Accessories
10.7 Castell lock
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 145
Preparing the operator panel
● Place the operator panel on a stable surface near the outline to be cut out.
● Use a hammer and screwdriver to cut out the groove base from the pre-pressed groove.
● File the edges of the cutout.
Preparing the Castell / fortress lock
● Remove the key.
● Attach the latch ② as far as it will go onto the square section ⑭ of the lock ⑬.
● Secure the latch ② by means of a threaded pin ⑥.
Accessories
10.7 Castell lock
3WT
146 Operating Instructions, 12/2018, 9239 0020 176 06
Installing the Castell / fortress lock in the housing
● Attach the lock ⑬ with latch ② to the housing ①.
● Screw the lock ⑬ onto the housing ① by means of a hexagon socket-head screw ④
and spring washer ⑤.
Installing the housing
● Push the seal ③ over the housing ①. When doing so, make sure that the wide edge of
the seal is on the lower part of the housing.
● Place the housing ① with lock ⑬ into the clips ⑯ on the side panel of the operating
mechanism ⑫. The locking pin ⑮ must audibly engage.
Accessories
10.7 Castell lock
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 147
Installing the operating device
Installing the operating device (Page 128)
Functional check
While pressing the OFF button, turn the key clockwise to the locking position.
● Remove the key.
● The Circuit breaker cannot close when in this position.
Accessories
10.8 3WT lock (set), 3 locks with 2 keys
3WT
148 Operating Instructions, 12/2018, 9239 0020 176 06
10.8
3WT lock (set), 3 locks with 2 keys
Article No.
Description
Article No.
Interlocking systems, 3WT lock (set), 3 locks with 2 keys
3WT9863-7JE00
Check the contents of the package
①
Key
2x
②
Lock
3x
Note
The setup package (Assembly kit for Castell / fortress lock) used for 3WT lock (set) needs to
be ordered separately. The article number as spare
part: 3WT9863-6JE00.
Accessories
10.8 3WT lock (set), 3 locks with 2 keys
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 149
Setup package for 3WT lock (set)
Check the contents of the package
①
Housing
1x
②
Latch
1x
③
Seal
1x
④
Hexagon socket-head screw M 6x10 ISO 4017
1x
⑤
Spring washer A6 DIN 128
2x
⑥
Threaded pin M 4x8 ISO 7435
1x
⑦
Door slider (metal)
1x
⑧
Door slider spring
1x
⑨
Lock washer
2x
CAUTION
The plastic door slider (if have) must be replaced by the metal door slider in this package.
Accessories
10.8 3WT lock (set), 3 locks with 2 keys
3WT
150 Operating Instructions, 12/2018, 9239 0020 176 06
Removing the operating device
Removing the operating device (Page 127)
Installing the door slider (if not already installed)
● Remove the screws ⑩ for the electronic overcurrent release ⑪.
● Remove the electronic overcurrent release ⑪.
● Place the door slider spring ⑧ with the off-center eye in the side panel of the operating
mechanism ⑫.
● Place the door slider spring ⑧ with the center eye in the door slider ⑦ using a small
screwdriver (see diagram).
Accessories
10.8 3WT lock (set), 3 locks with 2 keys
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 151
● Place the door slider ⑦ with the door slider spring ⑧ on the side panel of the operating
mechanism ⑫ and secure it by means of the lock washers ⑨.
● Install the electronic overcurrent release ⑪. When doing so, make sure that you do not
trap any cables.
Preparing the operator panel
● Place the operator panel on a stable surface near the outline to be cut out.
● Use a hammer and screwdriver to cut out the groove base from the pre-pressed groove.
● File the edges of the cutout.
Preparing the 3WT lock
● Remove the key.
● Attach the latch ② as far as it will go onto the square section ⑭ of the lock ⑬.
● Secure the latch ② by means of a threaded pin ⑥.
Accessories
10.8 3WT lock (set), 3 locks with 2 keys
3WT
152 Operating Instructions, 12/2018, 9239 0020 176 06
Installing the 3WT lock in the housing
● Attach the lock ⑬ with latch ② to the housing ①.
● Screw the lock ⑬ onto the housing ① by means of a hexagon socket-head screw ④
and spring washer ⑤.
Installing the housing
● Push the seal ③ over the housing ①. When doing so, make sure that the wide edge of
the seal is on the lower part of the housing.
● Place the housing ① with lock ⑬ into the clips ⑯ on the side panel of the operating
mechanism ⑫. The locking pin ⑮ must audibly engage.
Accessories
10.8 3WT lock (set), 3 locks with 2 keys
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 153
Installing the operating device
Installing the operating device (Page 128)
Functional check
While pressing the OFF button, turn the key clockwise to the locking position.
● Remove the key
● The Circuit breaker cannot close when in this position.
Accessories
10.9 Mechanical interlock
3WT
154 Operating Instructions, 12/2018, 9239 0020 176 06
10.9
Mechanical interlock
10.9.1
Information about mechanical interlock
Note
To ensure that the interlock functions properly, the following minimum switchgear
requirements must be fulfilled:
1.
Bowden wires must be laid so that they are as straight as possible.
2.
The bending radii of the Bowden wire must be > 500 mm.
3.
The total bending angle across the length of the Bowden wire must not exceed 540°.
4.
If the Circuit breakers to be interlocked are arranged vertically, the interlock mechanisms
must be aligned.
5.
Circuit breakers to be interlocked must be arranged in such a way that 2 m or 4.5 m
Bowden wires can be properly laid in accordance with the conditions specified in points 1.
- 4.
6.
The Bowden wires must be secured before the interlock is adjusted (e.g. cable ties).
7.
When choosing the switchgear compartment, make sure that it provides sufficient room
for adjusting the interlock.
8.
Openings and cutout sections in system elements must be designed in such a way that
the direction of the Bowden wires is not changed and that the wires are not obstructed
when they are routed.
Accessories
10.9 Mechanical interlock
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 155
Mechanical interlock module
①
Output 1
②
Output 2
③
Input 2
④
Input 1
⑤
Index brackets
⑥
The cylinder-head screws with strain washers
The mechanical interlock module can be used for two or three Circuit breakers. The following
designations apply in the configuration instructions below:
● O1/2 : Output information 1/2
● I1/2 : Input information 1/2
● S1/2/3: Circuit breaker 1/2/3
Accessories
10.9 Mechanical interlock
3WT
156 Operating Instructions, 12/2018, 9239 0020 176 06
If the output information 1 of Circuit breaker 1 is interconnected with the input information 2
of Circuit breaker 2, for example, the following abbreviations are used:
S1 O1 - S2 I2
The statuses of the Circuit breakers are indicated on the operator panel as follows:
Circuit breaker CLOSED
Circuit breaker OPEN and not ready to CLOSE (interlocked)
Circuit breaker OPEN and ready to CLOSE (not interlocked)
Configuration: Two Circuit breakers back to back
Description:
A Circuit breaker can only be closed when the other is open.
Required equipment:
Each Circuit breaker is equipped with an interlocking module and a Bowden wire.
Terminals for the Bowden wires:
1. Bowden wire: S1 O1 - S2
I1
2. Bowden wire: S1 I1 - S2 O1
Note
The cylinder
-head screws with strain washers must be screwed into t
he index brackets at the
following terminals: S
1 I1; S2 I1 .
In certain configurations, additional Bowden wires are required.
Please see chapter Installing Bowden wire (Page 172)
Accessories
10.9 Mechanical interlock
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 157
Configuration: Three Circuit breakers stacked
Description:
Any two Circuit breakers can be closed at any time, with the third interlocked.
Required equipment:
Each Circuit breaker is equipped with an interlocking module and a Bowden wire. Three
additional Bowden wires must be ordered separately.
Terminals for the Bowden wires:
1. Bowden wire: S1 O1 - S2 I1
2. Bowden wire: S1 O2 - S3 I1
3. Bowden wire: S2 O1 - S1 I1
4. Bowden wire: S2 O2 - S3 I2
5. Bowden wire: S3 O1 - S1 I2
6. Bowden wire: S3 O2 - S2 I2
Possible Circuit breaker statuses:
Example:
Accessories
10.9 Mechanical interlock
3WT
158 Operating Instructions, 12/2018, 9239 0020 176 06
Configuration: Three Circuit breakers stacked
Description:
When one Circuit breaker is closed, the other two cannot be closed.
Required equipment:
Each Circuit breaker is equipped with an interlocking module and a Bowden wire. Three
additional Bowden wires must be ordered separately.
Terminals for the Bowden wires:
1. Bowden wire: S1O1 - S2I1
2. Bowden wire: S1O2 - S3I1
3. Bowden wire: S2O1 - S1I1
4. Bowden wire: S2O2 - S3I2
5. Bowden wire: S3O1 - S1I2
6. Bowden wire: S3O2 - S2I2
Note
The cylinder
-head screws with strain washer must be screwed into the index brackets at the
following te
rminals:
S2I1, S3I1, S1I1, S3I2, S1I2, S2I2.
Possible Circuit breaker statuses:
Example:
Accessories
10.9 Mechanical interlock
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 159
Configuration: Three Circuit breakers back to back
Description:
Two Circuit breakers can be closed/opened independently of each other, with the third only
ready to be closed when the other two are open. If the third Circuit breaker is closed, the
other two cannot be closed.
Required equipment:
Each Circuit breaker is equipped with an interlocking module and a Bowden wire. The
Bowden wire must be ordered separately.
Terminals for the Bowden wires:
1. Bowden wire: S1O1 - S2I1
2. Bowden wire: S2O1 - S1I1
3. Bowden wire: S2O2 - S3I1
4. Bowden wire: S3O1 - S2I2
Note
The cylinder
-head screws with strain washer must be screwed into the index brackets at the
following terminals:
S2I1, S1I1, S3I1, S2I2.
Possible Circuit breaker statuses:
Example:
Accessories
10.9 Mechanical interlock
3WT
160 Operating Instructions, 12/2018, 9239 0020 176 06
Configuration: Three Circuit breakers, of which two are back to back
Description:
One Circuit breaker can be closed/opened independently of the other two. The two other
Circuit breakers are mutually exclusive, that is, one can only be closed when the other is
open.
Required equipment:
Two of the three Circuit breakers are each equipped with an interlocking module and a
Bowden wire.
Terminals for the Bowden wires:
1. Bowden wire: S2O1 - S3I1
2. Bowden wire: S3O1 - S2I1
Note
The cylinder
-
head screws with strain washers must be screwed into the index brackets at the
follo
wing terminals:
S3I1, S2I1.
Possible Circuit breaker statuses:
Example:
Accessories
10.9 Mechanical interlock
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 161
10.9.2
Mechanical interlock of fixed-mounted Circuit breakers
Article No.
Description
Article No.
Mutual mechanical interlock for fixed-mounted Circuit breaker
3WT9866-3JA00
Check the contents of the packaging
Accessories
10.9 Mechanical interlock
3WT
162 Operating Instructions, 12/2018, 9239 0020 176 06
Parts list
①
Fixed mounting plate
1x
②
Interlocking module
1x
③
Spring bush
1x
④
Control unit
1x
⑤
Slotted washer
1x
⑥
Auxiliary shaft, cpl. frame size 1
1x
⑦
Auxiliary shaft, cpl. frame size 2
1x
⑧
Bowden wire
1x
⑨
Cable tie
1x
⑩
Insertable nut M6
2x
⑪
Setnut M6
1x
⑫
Compression spring
1x
⑬
Strain washer 6 DIN 6796
9x
⑭
Cylinder-head screw M6 x 12 DIN 912
5x
⑮
Cylinder-head screw M6 x 25 DIN 912
4x
⑯
Part cover
1x
Preparatory work
- Opening the Circuit breaker and discharging the stored energy springs
- Disconnect auxiliary circuits
See chapter Preparatory work (Page 102)
The minimum distance (a) required between the Circuit breaker and cabinet unit ⑰ is as
follows:
● For frame size 1 : a = 150 mm
● For frame size 2 : a = 200 mm
If necessary, remove the Circuit breaker.
Note
If the module is already installed, continue with "Information about mechanical interlock".
-
See chapter
Information about mechanical interlock (Page 154)
Accessories
10.9 Mechanical interlock
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 163
Removing the operating device
Removing the operating device (Page 127)
Preparing the operator panel
● Cut out a sub-shaft hole outline ⑱ using snipe-nose pliers.
● With frame size 2, the sub-shaft hole outline ⑱ must also be cut out of the cover.
● File the cutout edges to fit the sub-shaft hole outline ⑱.
Installing the auxiliary shaft in the Circuit breaker
● Remove the motorized operating mechanism (if installed).
● Remove the second auxiliary switch (if installed).
● Unscrew and remove the fixing screw from the underside of the bearing plate.
● Unscrew the cylinder-head screws ⑲ (turn three or four times only) and loosen the
mounting plate (for frame size 1 only).
● Unscrew and remove ⑳ the fixing screw from the top of the bearing plate.
Accessories
10.9 Mechanical interlock
3WT
164 Operating Instructions, 12/2018, 9239 0020 176 06
● Remove the bearing plate with auxiliary shaft .
● Attach the control unit (see below).
● Install the auxiliary shaft, cpl. ⑥ or ⑦ in the same position as the old one.
● Complete the Circuit breaker by carrying out the above steps in reverse order.
Attaching the control unit
● Remove the cover and attach the control unit ④ to the breaker shaft (must audibly
engage).
● Attach the part cover ⑯ to the operator panel.
Installing the operating device
Installing the operating device (Page 128)
Accessories
10.9 Mechanical interlock
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 165
Installing the interlocking module
● Place the interlocking module ② against the fixed mounting plate ①.
● Secure the interlocking module ② and fixed mounting plate ① by means of cylinder-
head screws ⑭ and strain washers ⑬ (tightening torque: 8 ± 1 Nm).
● Depending on the configuration, screw the cylinder-head screw ⑭ with strain washer ⑬
into the index brackets (tightening torque: 8 ± 1 Nm).
Installing the fixed mounting plate
Note
Shown here without interlocking module
Accessories
10.9 Mechanical interlock
3WT
166 Operating Instructions, 12/2018, 9239 0020 176 06
● Push the insertable nuts ⑬ into the openings provided.
● Insert the setnuts ⑪ with cylinder-head screw ⑮ into the support brackets (without
fixed mounting plate ①).
● Remove the cylinder-head screws ⑮ again.
● Place the fixed mounting plate ① onto the Circuit breaker and secure by means of
cylinder-head screws ⑮ and strain washers ⑬ (tightening torque: 8 ± 1 Nm).
Note
Position the strain washers only as shown.
Installing Bowden wire
Installing Bowden wire (Page 172)
Accessories
10.9 Mechanical interlock
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 167
10.9.3
Mechanical interlock of withdrawable Circuit breakers
Article No.
Description
Article No.
Mutual mechanical interlock for withdrawable Circuit breaker
3WT9866-4JA00
Check the contents of the packaging
Accessories
10.9 Mechanical interlock
3WT
168 Operating Instructions, 12/2018, 9239 0020 176 06
Parts list
①
Interlocking module
1x
②
Control unit
1x
③
Slotted washer
1x
④
Spring bush
1x
⑤
Setnut M6
3x
⑥
Cylinder-head screw M6 x 12 DIN 912
5x
⑦
Strain washer 6 DIN 6796
5x
⑧
Compression spring 1 x 12.5 x 55.5 DIN 2098
1x
⑨
Part cover
1x
⑩
Auxiliary shaft, cpl. frame size 1
1x
⑪
Auxiliary shaft, cpl. frame size 2
1x
⑫
Bowden wire
1x
⑬
Cable tie
1x
Preparatory work
● Opening the Circuit breaker and discharging the stored energy springs
● Disconnect auxiliary circuits
● Pull Circuit breaker to maintenance position and remove
Preparatory work (Page 102)
Removing the operating device
Removing the operating device (Page 127)
Preparing the operator panel
● Cut out a sub-shaft hole outline ⑭ using snipe-nose pliers.
● With frame size 2, the sub-shaft hole outline ⑭ must also be cut out of the cover.
● File the cutout edges to fit the sub-shaft hole outline ⑭.
Accessories
10.9 Mechanical interlock
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 169
Install auxiliary shaft in Circuit breaker
● Remove the motorized operating mechanism (if installed).
● Remove the auxiliary switches (if installed).
● Unscrew and remove the fixing screw ⑱ from the underside of the bearing plate.
● Unscrew the cylinder-head screws ⑮ (turn three or four times only) and loosen the
mounting plate (for frame size 1 only).
● Unscrew and remove the fixing screw ⑯ from the top of the bearing plate.
● Remove the bearing plate with auxiliary shaft ⑰.
● Attach the control unit
● Install the auxiliary shaft, cpl. ⑩ or ⑪ in the same position as the old one.
● Complete the Circuit breaker by carrying out the above steps in reverse order.
Attaching the control unit
Remove ⑳ the cover and attach the control unit ② to the breaker shaft ⑲ (must audibly
engage).
● Attach the part cover ⑨ to the operator panel.
Accessories
10.9 Mechanical interlock
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 171
Place the interlocking module ① against the guide frame .
● Secure the interlocking module ① and guide frame by means of cylinder-head screws
⑥, strain washers ⑦, and setnuts ⑤ (tightening torque: 8 ± 1 Nm).
● Depending on the configuration, screw the cylinder-head screw ⑥ with strain washer ⑦
into the index brackets (tightening torque: 8 ± 1 Nm).
*) If a 30 x 22 mm cutout is not provided, you must create it yourself.
Installing Bowden wire
Installing Bowden wire (Page 172)
Accessories
10.9 Mechanical interlock
3WT
172 Operating Instructions, 12/2018, 9239 0020 176 06
10.9.4
Installing Bowden wire
Article No.
Description
Article No.
Bowden wire (2 m)
3WT9866-8JA00
Bowden wire (3 m) 3WT9866-8JA02
Bowden wire (4.5 m)
3WT9866-8JA02
Check the contents of the packaging
①
Bowden wire
1x
②
Spring bush
1x
③
Slotted washer
1x
④
Compression spring 1 x 12.5 x 55.5 DIN 2098
1x
⑤
Cylinder-head screw M6 x 12 DIN 912
1x
⑥
Strain washer 6 DIN 6796
1x
⑦
Cable tie
1x
Accessories
10.9 Mechanical interlock
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 173
Inserting and adjusting the Bowden wire
Terminal O1 ; O2
Terminal I1 ; I2
•
Push Bowden wire
⑫
with nipple
⑯
through angle plate ⑭, compression
spring ⑬, and insertable plate ⑮.
•
Secure Bowden wire ⑫ and nipple ⑯
by means of slotted washer ③.
•
Screw adjusting screw ⑨ with lock nut
⑩ into plate ⑪.
•
When the Bowden wire is attached on
both sides, the sheath ⑧ must have
approx. 1 mm clearance. If necessary,
adjust with adjusting screw ⑨.
•
Fix the setting by means of the lock nut
⑩.
•
Push the compression spring
④
and
spring bush ② over the tube holder ⑱
and sheath ⑧.
•
Place the Bowden wire ⑫ with nipple ⑯
into the index brackets ⑰.
•
Place the spring bush ② onto the index
brackets ⑰.
•
Press the compression spring ④
between the spring bush ② and plate
⑲.
•
Push the tube holder ⑱ into the plate
⑲.
Accessories
10.9 Mechanical interlock
3WT
174 Operating Instructions, 12/2018, 9239 0020 176 06
Installing the Bowden wire
● Bowden wires ① must be installed in such a way that they are not bent excessively
(large bending radii).
● Secure Bowden wires ① by means of cable ties ⑦.
● Minimum permissible bending radius: R = 50 mm. This bending radius is only permitted a
maximum of six times for each Bowden wire. The remaining bending radii should be as
large as possible.
WARNING
If a mechanical Circuit breaker interlock is installed, two or more Circuit breakers
must
not be closed simultaneously
by electrical or mechanical means.
The delay between the close commands must be at least 100 ms.
Accessories
10.10 Door interlock
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 175
10.10
Door interlock
10.10.1
Door interlock for fixed-mounted Circuit breaker
Article No.
Description
Article No.
Door interlock for fixed-mounted Circuit breaker
3WT9867-2JA00
Check the contents of the packaging
①
Interlocking module
(1x)
②
Catch
(1x)
③
Hexagon nut M5, DIN 934
(2x)
④
Strain washer 6, DIN 6796
(1x)
⑤
Washer 5.3, DIN 125
(2x)
⑥
Lock washer 5, DIN 6799
(1x)
⑦
Hexagon socket-head screw M6x30, DIN 912
(1x)
⑧
Clip
(1x)
⑨
Tension spring with lug
(1x)
Accessories
10.10 Door interlock
3WT
176 Operating Instructions, 12/2018, 9239 0020 176 06
Preparatory work
● Opening the Circuit breaker and discharging the stored energy springs
● Disconnect auxiliary circuits
● Pull Circuit breaker to maintenance position and remove
See chapter Preparatory work (Page 102)
Removing the operating device
See chapter Removing the operating device (Page 127)
Installing the interlocking module
1.
Push the interlocking module ① in front of the plastic front panel ⑩ of the Circuit breaker.
2.
Secure the module (8 ± 1 Nm). Note the position of the strain washer ⑦.
Accessories
10.10 Door interlock
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 177
3. Insert the tension spring
②
with lug
⑭
behind the geared motor
⑬
. Place the tension spring
②
in the lever ⑫ of the breaker shaft ⑪.
4.
Place the lug ⑭ on the pin ⑮.
5.
Secure the lug ⑭ by means of the lock washer ⑨.
Installing the operating device
Installing the operating device (Page 128)
Accessories
10.10 Door interlock
3WT
178 Operating Instructions, 12/2018, 9239 0020 176 06
Install the catch in the cabinet door
1. Drill holes with a diameter of 5.5 mm in the cabinet door ⑯.
2. Screw on the catch ② (tightening torque for component ③: 0.4 Nm).
Functional check
1. Position with Circuit breaker OPEN
2. Position with Circuit breaker CLOSED
3. Overrule
4. Position in overruled condition
Accessories
10.10 Door interlock
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 179
10.10.2
Door interlock for guide frame
Article No.
Description
Article No.
Door interlock for withdrawable Circuit breaker
3WT9867-1JC00
Check the contents of the packaging
①
Bolt
(1x)
②
Catch
(1x)
③
Hexagon nut M5, DIN 934
(2x)
④
Washer 5.3, DIN 125
(2x)
⑤
Clip
(1x)
⑥
Tension spring
(1x)
Preparatory work
● Opening the Circuit breaker and discharging the stored energy springs
● Disconnect auxiliary circuits
● Pull Circuit breaker to maintenance position and remove
See chapter Preparatory work (Page 102)
Accessories
10.10 Door interlock
3WT
180 Operating Instructions, 12/2018, 9239 0020 176 06
Installing the bolt in the guide frame
● Place the bolt 1 on the crossmember ⑧ of the guide frame ⑨.
● Position the bolt approx. 90° to the crossmember.
● Bend down the metal lugs ⑦ on the bolt.
● Place the tension spring ⑥ in the bolt ① and crossmember ⑧.
Accessories
10.10 Door interlock
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 181
Install the catch in the cabinet door
1. Drill holes with a diameter of 5.5 mm in the cabinet door ⑯.
2. Screw on the catch ② (tightening torque for component ③: 0.4 Nm).
Functional check
This can only be carried out once the Circuit breaker has been installed.
The switchgear door is interlocked after approx. 4 rotations of the racking handle from the
test position toward the connected position.
Accessories
10.11 Phase barrier
3WT
182 Operating Instructions, 12/2018, 9239 0020 176 06
10.11
Phase barrier
The phase barrier is an accessory of the Circuit breaker which is used for phase short circuit
isolation. It provides necessary guide slots and installs fixed interface on the rear wall of the
fixed-mounted Circuit breaker and guide frame.
Check contents of package
Item
Description
Fixed-mounted breaker
Withdrawable breaker
Size I –
3P
Size I –
4P
Size II –
3P
Size II –
4P
Size I –
3P
Size I –
4P
Size II –
3P
Size II –
4P
①
Cross beam I - 3 pole 2X
②
Cross beam I - 4 pole 2X
③
Clip for withdrawable 4X 6X
④
Clip 4X 6X 2X 3X 4X 6X
⑤
Fastener 4X 6X
⑥
Insert nut 4X 6X
⑦ Socket cap screw
M6x16
4X 6X 4X 4X 8X 12X
⑧
Clamping washer 4X 6X 4X 4X 8X 12X
⑨
Phase plate 2X 3X
⑩
Phase plate 2X 3X
⑪
Phase plate 2X 3X
⑫
Phase plate 2X 3X
Accessories
10.11 Phase barrier
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 183
10.11.1
Phase barrier for fixed-mounted Circuit breaker
Article No.
Description
Article No.
Phase barrier for fixed-mounted Circuit breaker, Size I, 3P
3WT9831-0AA00
Phase barrier for fixed-mounted Circuit breaker, Size I, 4P 3WT9831-0AC00
Phase barrier for fixed-mounted Circuit breaker, Size II, 3P
3WT9831-0AE00
Phase barrier for fixed-mounted Circuit breaker, Size II, 4P
3WT9831-0AG00
Preparatory work
● Opening the Circuit breaker and discharging the stored energy springs
● Disconnect auxiliary circuits
● Pull Circuit breaker to maintenance position and remove
Preparatory work (Page 102)
Accessories
10.11 Phase barrier
3WT
184 Operating Instructions, 12/2018, 9239 0020 176 06
Assembly (size I)
Take 3-pole as an example:
1.
Take out the arc chute ⑬.
2. Place the insert nut
⑥
into the corresponding hole
⑮
on the rear wall
⑭
, and then use allen
wrench, socket cap screw ⑦ and clamping washer ⑧ to fix the clip ④ to the upper end of the
rear wall ⑭.
Accessories
10.11 Phase barrier
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 185
3.
Take out the fasteners ⑯⑰ of the corresponding CT cover ⑱, as shown in the diagram.
4.
Take out the fasteners ⑯⑰ of the corresponding CT cover ⑱, as shown in the diagram.
Accessories
10.11 Phase barrier
3WT
186 Operating Instructions, 12/2018, 9239 0020 176 06
5. Insert the phase plate
⑪
, which is fixed in the correct position when you hear the "click" sound,
which ensures that the upper and lower hole of phase plate should be both placed within the clip
point. Pay attention that the placement direction of both upper and lower clips should be the same
as in the diagram.
6.
Install the arc chute ⑬ into to the Circuit breaker again and fix it as shown in the diagram.
Accessories
10.11 Phase barrier
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 187
Assembly (size II)
Take 3-pole as an example:
1.
Take out the fasteners ⑳of the CT cover, as shown in the diagram.
2. Use the fasteners
⑳
to fix the clip
④
to the corresponding mounting hole of the CT cover,
as shown in the diagram.
Accessories
10.11 Phase barrier
3WT
188 Operating Instructions, 12/2018, 9239 0020 176 06
3. Insert the phase plate
⑫
, that is fixed in the correct position when you hear the "click" sound,
which ensures that the upper and lower hole of phase plate should be both placed within the clip
point. Pay attention that the placement direction of both upper and lower clips should be the same
as in the diagram.
Accessories
10.11 Phase barrier
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 189
10.11.2
Phase barrier for guide frame
Article No.
Description
Article No.
Phase barrier for withdrawable Circuit breaker, Size I, 3P
3WT9831-0AB00
Phase barrier for withdrawable Circuit breaker, Size I, 4P 3WT9831-0AD00
Phase barrier for withdrawable Circuit breaker, Size II, 3P
3WT9831-0AF00
Phase barrier for withdrawable Circuit breaker, Size II, 4P
3WT9831-0AJ00
Assembly for size I
Take 3-pole as an example:
1. Use fasteners
⑦⑧
to fix the cross beam
①
to the upper and bottom location of the guide
frame . See in the diagram, and pay attention to the difference of placement direction for the
upper and lower cross beam.
Accessories
10.11 Phase barrier
3WT
190 Operating Instructions, 12/2018, 9239 0020 176 06
2. Insert the clip
③
to the location between cross beam and rear wall of guide frame, see the
diagram, and it is fixed in the correct position when you hear the "click" sound. Pay attention to
the placement direction of clip ③.
3. Insert the phase plate
⑨
, which is fixed in the correct position when you hear the "click" sound,
which ensures that the upper and lower hole of phase plate should be both placed within the clip
point.
Accessories
10.11 Phase barrier
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 191
Assembly for size II
Take 3-pole as an example:
1. Use socket cap screw
⑦
, clamping washer
⑧
and fastener
⑤
to install the clip
④
to the upper
and bottom supporting angle of the guide frame. Just keep them in connection, with no need
to fasten them. Pay attention to the placement direction of the clip, as shown in diagram.
2. Insert the phase plate
⑩
, which is fixed in the correct position when you hear the "click" sound,
which ensures that the upper and lower hole of phase plate should be both placed within the clip
point.
3.
Fasten the screw which is for installing the clip.
Accessories
10.12 Automatic mechanical resetting device after overcurrent tripping
3WT
192 Operating Instructions, 12/2018, 9239 0020 176 06
10.12
Automatic mechanical resetting device after overcurrent tripping
Article No.
Description
Article No.
Automatic mechanical resetting device after overcurrent tripping
3WT9888-2JA00
Check contents of package
①
Leaf spring
1 X
②
Lock washer DIN 6799 - 4
4 X
③
Cable binders
2 X
Accessories
10.12 Automatic mechanical resetting device after overcurrent tripping
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 193
DANGER
Hazardous voltage
Hazardous stored-energy spring mechanism
Before starting work, the device must be disconnected from the supply and protected
against reactivation.
Only carry out work on the device when the Circuit breaker is shut down and the stored-
energy spring mechanism is discharged.
Failure to do so can result in death, severe injury, or substantial material damage.
The devices must be installed and mounted by qualified, authorized personnel only.
Preparatory work
● Opening the Circuit breaker and discharging the stored energy springs
● Disconnect auxiliary circuits
● Pull Circuit breaker to maintenance position and remove
See chapter Preparatory work (Page 102)
Removing control panel
● Undo fixing screws ④
● Swivel the hand lever ⑤ forward
● Extract the control panel ⑥ towards you
Accessories
10.12 Automatic mechanical resetting device after overcurrent tripping
3WT
194 Operating Instructions, 12/2018, 9239 0020 176 06
Dismantling the electronic overcurrent release
● Undo screws ⑦ and tilt the electronic overcurrent release ⑧ out sideways.
● If necessary, cut through the cable binders.
Dismantling the fixing bracket
● Undo socket-head screws ⑨ by 3 to 4 turns and loosen the mounting plate.
● Undo hexagon socket-head screw ⑩ and thread rolling screw ⑪ of fixing bracket ⑫.
● Lift mounting plate ⑬.
● Remove fixing bracket ⑫ as shown.
Accessories
10.12 Automatic mechanical resetting device after overcurrent tripping
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 195
Fitting the leaf spring
● Remove the lock washers ⑭.
● Pull axle ⑮ out of the fixing bracket ⑯.
● Push axle ⑮ as shown through leaf spring ①, lever ⑰ and fixing bracket ⑯ and secure
with lock washers ⑭.
Accessories
10.12 Automatic mechanical resetting device after overcurrent tripping
3WT
196 Operating Instructions, 12/2018, 9239 0020 176 06
Fitting the fixing bracket
● Lift mounting plate ⑬
● Place fixing bracket ⑫ with leaf spring ① against Circuit breaker as shown, making sure
that leaf spring ① is positioned between breaker shaft ⑲ and cam ⑳ (see view X). The
lever ⑰ must be in contact with the tripping solenoid ⑱ and be positioned above the
driver pin as shown.
● Fasten hexagon socket-head screw ⑩ (tightening torque 8 Nm ± 1 Nm) and thread
rolling screw ⑪ (tightening torque 3 Nm ± 0.3 Nm) on fixing bracket ⑫.
● Fasten mounting plate ⑬ with socket-head screws ⑨ (tightening torque 8 Nm ± 1 Nm).
1)
Caution:
The lever ⑰ must beat the right side of the tripping solenoid as shown.
Accessories
10.12 Automatic mechanical resetting device after overcurrent tripping
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 197
Installing the electronic overcurrent release
● Place electronic overcurrent release ⑧ against Circuit breaker, making sure that no
cables are pinched.
● Fix electronic overcurrent relay ⑧ to Circuit breaker by means of screws ⑦ (tightening
torque 3 Nm + 0.3 Nm).
Final operations
Fit the control panel in reverse order.
Caution!
With withdrawable Circuit breakers, close off the crank hole before fitting control
panel.
Accessories
10.13 Switching from fixed-mounted Circuit breakers to withdrawable Circuit breakers
3WT
198 Operating Instructions, 12/2018, 9239 0020 176 06
10.13
Switching from fixed-mounted Circuit breakers to withdrawable
Circuit breakers
Article No.
Description
Article No.
Conversion set from fixed-mounted to withdrawable version
Size I, 3P
3WT9888-0GA00
Size I, 4P 3WT9888-0HA00
Size II, 3P
3WT9888-0KA00
Size II, 4P
3WT9888-0LA00
Check the contents of the packaging
Accessories
10.13 Switching from fixed-mounted Circuit breakers to withdrawable Circuit breakers
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 199
①
Positioning actuator
1x
②
Angle bracket (left)
1x
③
Angle bracket (right)
1x
④
Hexagon socket-head screw M6x30 DIN 912
1x
⑤
Countersunk screw M6x20 DIN 7991
8x
⑥
Hexagon socket-head screw M6x12 or similar, DIN 912
FS I 2x, FS II 3x
⑦
Strain washer 6 DIN 6796
1x
⑧
Washer 6,4 DIN 433
FS I 1x, FS II 2x
⑨
Insert
1x
⑩
Lever
1x
⑪
Slide switch
1x
⑫
Leg spring
1x
⑬
Plastite screw 6. 19x10
2x
⑭
DUOCLIPS 4SXN 10
1x
⑮
Adhesive label
1x
⑯
Door slider
1x
⑰
Door slider spring
1x
⑱
Lock washer DIN 6799-5
2x
Note
The components are shown in simplified form.
Article number
Frame size
Number of poles
Dimension "I" (Part 1)
3WT9888-0GA00
3WT9888-0KA00
3WT9888-0HA00
3WT9888-0LA00
I
II
I
II
3
3
4
4
281
381
371
501
Preparatory work
● Opening the Circuit breaker and discharging the stored energy springs
● Disconnect auxiliary circuits
See chapterPreparatory work (Page 102)
Removing the operating device
Removing the operating device (Page 127)
Accessories
10.13 Switching from fixed-mounted Circuit breakers to withdrawable Circuit breakers
3WT
200 Operating Instructions, 12/2018, 9239 0020 176 06
Unscrewing the angle bracket
Attaching the positioning actuator
● Place the Circuit breaker on its back.
Important:
place it on a soft surface.
The underside of the Circuit breaker should ideally point to the installation engineer.
● Push the angle bracket ② and ③ over the shaft ends and of the positioning actuator
and position up against the Circuit breaker housing.
● Insert the positioning actuator ① in the Circuit breaker and secure by means of the
screw ④ and strain washer ⑧ (tighten by hand only).
● Secure the angle brackets ② and ③ by means of the screws ⑤ (tightening torque: 8 ± 1
Nm).
● Fix the positioning actuator securely by means of the screw ④ (tightening torque: 8 ± 1
Nm).
● Screw the coding screws ⑥ for the rated current coding into the base plate of the
positioning actuator ①.
Note
The coding screws are thread
-shaped screws, which means that they require a higher
tightening torque.
For the arrangement of the coding screws, see the diagram below.
Tightening torque: 8
± 1 Nm
● Place the Circuit breaker in an upright position again.
Accessories
10.13 Switching from fixed-mounted Circuit breakers to withdrawable Circuit breakers
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 201
Coding scheme
Rated current
Frame size
Coding screw in hole
≤ 1250 A, N/S1)
1600 A, N
1600 A, S
I
I
I
a
a
b
630 - 2500 A
3200 A
3800 A
II
II
II
a
c
b
1)
N: Circuit breakers with normal breaking capacity.
S: Circuit breakers with standard breaking capacity.
Accessories
10.13 Switching from fixed-mounted Circuit breakers to withdrawable Circuit breakers
3WT
202 Operating Instructions, 12/2018, 9239 0020 176 06
● Insert the shutter and slide switch ⑫ into the cutout of the operator panel together
from inside and secure by means of screws ⑭.
● Make sure that the shutter can move without hindrance and leave it closed.
● Place the lever ⑪ and leg spring ⑬ onto the pins of the operator panel.
● Place the bent leg 13 over lever ⑪ so that leg 13 can be moved by lever ⑪.
● Secure both parts by means of DUOCLIPS ⑮.
Important:
The lever ⑪ must rotate without hindrance.
Accessories
10.13 Switching from fixed-mounted Circuit breakers to withdrawable Circuit breakers
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 203
Attaching the adhesive label and changing the rating plate.
Stick the label ⑯ onto the front of the operator panel.
Changing the rating plate:
Change the 12th digit of the MLFB to "4" and the 13th to "5" (use an indelible marker).
Accessories
10.13 Switching from fixed-mounted Circuit breakers to withdrawable Circuit breakers
3WT
204 Operating Instructions, 12/2018, 9239 0020 176 06
Installing the door slider (if not already installed)
● Remove the screws for the electronic overcurrent release.
● Remove the electronic overcurrent release.
● Place the door slider spring ⑱ with the off-center eye in the side panel of the operating
mechanism.
● Place the door slider spring ⑱ with the center eye in the door slider ⑰ using a small
screwdriver (see diagram).
● Place the door slider ⑰ with the door slider spring ⑱ on the side panel of the operating
mechanism and secure it by means of the lock washers ⑲.
● Attach the electronic overcurrent release . When doing so, make sure that you do
not trap any cables.
Installing the operating device
Installing the operating device (Page 128)
Accessories
10.13 Switching from fixed-mounted Circuit breakers to withdrawable Circuit breakers
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 205
Encoding in the guide frame
Coding scheme
Rated current
Frame size
Coding screws in hole
≤ 1250 A, N/S
1600 A, N
1600 A, S
I
I
I
b
b
a
630 - 2500 A
3200 A
3800 A
II
II
II
b + c
a + b
a + c
Accessories
10.13 Switching from fixed-mounted Circuit breakers to withdrawable Circuit breakers
3WT
206 Operating Instructions, 12/2018, 9239 0020 176 06
Summary of coding for Circuit breaker and guide frame
FS
Rated current
Coding
Circuit breaker
Withdrawable part
a
b
c
a
b
c
I
≤ 1250 A, N/S
●
○
○
●
1600 A, N
●
○
○
●
1600 A, S
○
●
●
○
II
630 - 2500 A
●
○
○
○
●
●
3200 A
○
○
●
●
●
○
3800 A
○
●
○
●
○
●
Accessories
10.14 Vertical connections for fixed-mounted Circuit breaker
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 207
10.14
Vertical connections for fixed-mounted Circuit breaker
Article No.
Description
Article No.
Vertical connection for fixed-mounted
circuit breaker
Size I, up to 1250 A, N/S class;
1600 A, N class
3WT9821-7AC00
Size I, 1600 A, S class 3WT9821-7BC00
Size II, 630 A and 2500 A, 3P
3WT9821-7DA00
Size II, 630 A and 2500 A, 4P
3WT9821-7DB00
Size II, 3200 A, 3P
3WT9821-7FA00
Size II, 3200 A, 4P
3WT9821-7FB00
Check the contents of the packaging
Accessories
10.14 Vertical connections for fixed-mounted Circuit breaker
3WT
208 Operating Instructions, 12/2018, 9239 0020 176 06
①
Connection piece
②
Connection piece
③
Connection piece
④
Connection piece
⑤
Connection piece
⑥
Connection piece
⑦
Connection piece
⑧
Connection piece
⑨
Connection piece
⑩
Connection piece
⑪
Connection piece
⑫
Hexagon-head screw M12 x 30 DIN933
⑬
Hexagon-head screw M12 x 45 DIN931
⑭
Hexagon-head screw M12 x 80 DIN931
⑮
Hexagon nut M12 DIN934
⑯
Strain washer 12 DIN6796
Article number
Frame
size / no.
of poles
Rated current
A
Number of items
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
3WT9821 - 7AC00 I / 3
I / 4
≤ 1250 A, N/S
1600 A, N
3
4
6
8
6
8
6
8
3WT9821 - 7BC00 I / 3
I / 4 1600 A, S 3
4
6
8
6
8
6
8
3WT9821 - 7DA00
3WT9821 - 7DB00
II / 3
II / 4
630-2500 1
1
2
3
6
8
6
8
6
8
3WT9821 - 7FA00
3WT9821 - 7FB00
II / 3
II / 4
3200 1
1
2
3
6
8
6
8
6
8
3WT9821-7FC00
3WT9821-7FD00
II / 3
II/4
4000 1
1
1
1
1
1
1 6
8
6
8
6
8
Preparatory work
● Opening the Circuit breaker and discharging the stored energy springs
● Disconnect auxiliary circuits
See chapter Preparatory work (Page 102)
Accessories
10.14 Vertical connections for fixed-mounted Circuit breaker
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 209
Installing the connection pieces (frame size I)
Place the connection piece ① or ② on the connection bar ⑰ as shown and secure by
means of a hexagon socket-head screw ⑫ or ⑬, strain washer ⑯ and hexagon nut ⑮
(tightening torque: 70 ± 7 Nm).
Accessories
10.14 Vertical connections for fixed-mounted Circuit breaker
3WT
210 Operating Instructions, 12/2018, 9239 0020 176 06
Installing the connection pieces (frame size II)
Place the connection pieces ③ and ④ or ⑤ and ⑥ on the connection bar ⑰ as shown
and secure by means of a hexagon socket-head screw ⑬ or ⑭, strain washer ⑯ and
hexagon nut ⑮ (tightening torque: 70 ± 7 Nm).
Note
Make sure that connection pieces
③ and ④ or ⑤ and ⑥ (symmetrical and asymmetrical)
are mounted in the correct position. The 3
-pole version does not have the outer connections
on the
right.
Accessories
10.15 Connection bars for guide frame (frame size I)
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 211
10.15
Connection bars for guide frame (frame size I)
Article No.
Description
Article No.
Vertical connection for guide frame
Size I, up to 1250 A, N/S class;
1600 A, N class
3WT9823-3AA00
Size I, 1600 A, S class 3WT9823-3BA00
Front connection for guide frame
Size I, up to 1250 A, N/S class;
1600 A, N class
3WT9823-1AA01
Size I, 1600 A, S class
3WT9823-1BA01
Check the contents of the packaging
①
Vertical connection 1250 A
②
Vertical connection 1600 A
③
Front connection with DIN hole pattern 1250 A
④
Front connection with DIN hole pattern 1600 A
⑤
Hexagon-head screw M6 x 25 - 8.8 DIN 933
⑥
Hexagon-head screw M6 x 35 - 8.8 DIN 933
⑦
Strain washer 6 DIN 6796
Accessories
10.15 Connection bars for guide frame (frame size I)
3WT
212 Operating Instructions, 12/2018, 9239 0020 176 06
Parts list
Article number
Rated current
Connection type
Quantity
1
2
3
4
5
6
7
3WT9823-3AA00
1250 A
Vertical connection
1
4
4
3WT9823-3BA00
1600 A
Vertical connection
1
4
4
3WT9823-1AA01 1250 A DIN front connection 1 2 2 4
3WT9823-1BA01
1600 A
DIN front connection
1
2
2
4
Preparatory work
● Opening the Circuit breaker and discharging the stored energy springs
● Disconnect auxiliary circuits
● Pull Circuit breaker to maintenance position and remove
See chapter Preparatory work (Page 102)
Installing the connection bars
Unscrew any connection pieces. To do so, unscrew the fixing screws ⑨ or ⑩ and remove
the connection pieces from the finger clusters ⑫. When doing so, make sure that you do not
pull the finger clusters out of the rear panel ⑬.
Note
If necessary, only insert finger clusters that have been removed in the position shown in Fig.
2, that is, the stop pi
n ⑭ must point toward the connection pieces.
Insert the new connection pieces as shown in Fig. 1 and Fig. 2 and secure them by means of
the enclosed screws and strain washers (tightening torque: 8 ± 1 Nm). See Fig. 1 for the
fixing screw assignments; see Fig. 2 for the position of the strain washers.
All diagrams are simplified.
Accessories
10.15 Connection bars for guide frame (frame size I)
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 213
Fig. 1: Rear panel of guide frame, rear view, possible connection types
Fig. 2: Position of the finger clusters
Accessories
10.16 Connection bars / connection pieces for guide frame version FS II
3WT
214 Operating Instructions, 12/2018, 9239 0020 176 06
10.16
Connection bars / connection pieces for guide frame version FS II
Article No.
Description
Article No.
Vertical connection for guide frame
Size II, 630 A and 2500 A, 3P
3WT9823-4AB00
Size II, 630 A and 2500 A, 4P 3WT9823-4AC00
Size II, 3200 A, 3P
3WT9823-4BB00
Size II, 3200 A, 4P
3WT9823-4BC00
Front connection for guide frame
Size II, 630 A and 2500 A
3WT9823-1DA01
Size II, 3200 A
3WT9823-1EA01
Check the contents of the packaging
Accessories
10.16 Connection bars / connection pieces for guide frame version FS II
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 215
①
Connection bar ≤ 2500 A, DIN hole pattern
②
Connection bar 3200 A, DIN hole pattern
③
Hexagon-head screw DIN 931 - M 10 x 40 - 8
④
Hexagon-head screw DIN 931 - M 10 x 55 - 8
⑤
Cylinder-head screw DIN 933 - M 6 x 40 - 8
⑥
Square nut M 6
⑦
Strain washer DIN 6796 - 10 - St
⑧
Strain washer DIN 6796 - 6 - St
⑨
Connection piece ≤ 2500A
⑩
Connection piece 3200A
⑪⑬
Hexagon-head screw DIN 933 - M6 x 16 - 8.8
⑫⑭
Strain washer DIN 6796 - 6 - Fst
⑮
Washer DIN 9021 - 6,4
Preparatory work
● Opening the Circuit breaker and discharging the stored energy springs
● Disconnect auxiliary circuits
● Pull Circuit breaker to maintenance position and remove
See chapter Preparatory work (Page 102)
Quantity of parts
Article number of packing unit
Circuit breaker frame size
a (mm)
Rated current (A)
Hole pattern
3WT9823 - 1DA01
II
≤ 2500
DIN / double-hole row
3WT9823 - 1EA01 II 3200 DIN / double-hole row
3WT9823 - 4AB00
3WT9823 - 4AC00
II 15 ≤ 2500
3WT9823 - 4BB00
3WT9823 - 4BC00 II 30 3200
Article number of packing unit
Part no.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
3WT9823 - 1DA01
1
2
2
2
2
2
3WT9823 - 1EA01
1
2
2
2
2
2
3WT9823 - 4AB00
3WT9823 - 4AC00
12
16
12
16
6
8
2
3
1
1
3WT9823 - 4BB00
3WT9823 - 4BC00
12
16
12
16
2
3
1
1
Accessories
10.16 Connection bars / connection pieces for guide frame version FS II
3WT
216 Operating Instructions, 12/2018, 9239 0020 176 06
Installing the connection bars
Installation sequence:
1. Press the connection bars in parallel onto the screw-on points ⑪ and tighten the screws
⑦ (tighten by hand only).
2. Tighten the screws ③ and ④ to 40 ± 4 Nm.
3. Tighten the screws ⑤ with ⑥ to ± 1 Nm.
Note
Note the position of
the strain washers.
Accessories
10.16 Connection bars / connection pieces for guide frame version FS II
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 217
Installing the connection pieces
1. Unscrew any connection pieces. To do so, unscrew the fixing screw ⑮ and remove the
connection pieces with the finger clusters (X) (Fig. 1).
2. Insert the new connection pieces (Fig. 2) and secure them by means of the enclosed
screws and strain washers (Fig. 3) (tightening torque: 8 ± 1 Nm).
Arrangement of the connection pieces
Accessories
10.17 Position signaling switch for guide frame
3WT
218 Operating Instructions, 12/2018, 9239 0020 176 06
10.17
Position signaling switch for guide frame
Article No.
Description
Article No.
Position signaling switch module (For withdrawable Circuit breaker only)
3WT9884-1JC10
Check the contents of the packaging (position signaling switch without intermediate terminal)
①
Screw
4 x
②
Washer
4 x
③
Position signaling switch module
1 x
④
Position signaling switch module
1 x
Preparatory work
● Opening the Circuit breaker and discharging the stored energy springs
● Disconnect auxiliary circuits
● Pull Circuit breaker to maintenance position and remove
See chapter Preparatory work (Page 102)
Accessories
10.17 Position signaling switch for guide frame
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 219
Installing the position signaling switch without intermediate terminal
Cross-tip screwdriver (size 2)
Accessories
10.17 Position signaling switch for guide frame
3WT
220 Operating Instructions, 12/2018, 9239 0020 176 06
Connecting the position signaling switch without intermediate terminal
Circuit diagrams
Connecting the position signaling switch (article number 3WT9884-1JC10)
Circuit diagrams
Accessories
10.18 Shutters
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 221
10.18
Shutters
Article No.
Description
Article No.
Shutters
Size I, 3P
3WT9884-3CA00
Size I, 4P 3WT9884-3DA00
Size II, 3P
3WT9884-3CB00
Size II, 4P
3WT9884-3DB00
Check the contents of the packaging for frame sizes I and II
Accessories
10.18 Shutters
3WT
222 Operating Instructions, 12/2018, 9239 0020 176 06
Frame size
I
I
II
II
Number of poles
3
4
3
4
Article number 3WT 9884
3CA00
3CB00
3DA00
3DB00
①
Control mechanism
2
2
2
2
②
Shutters
1
③
Shutters
2
④
Cover
2
⑤
Cover
2
⑥
Shutters
2
⑦
Shutters
2
⑧
Cover
2
⑨
Cover
2
⑩
Insulating plate
1
⑪
Insulating plate
1
⑫
Cover strip
3
5
⑬
Hook
2
2
2
2
⑭
Pan-head screw M 4 x 8 ISO 7045
2
2
2
2
⑮
Plastite screw 6- 19 x 10
8
8
4
5
⑯
Washer 4,3 DIN 125
4
5
⑰
Strain washer 4 DIN 6796
2
2
2
2
⑱
Shutters
1
Note
These operating instructions apply to 3 and 4
-pole guide frames.
Preparatory work
● Opening the Circuit breaker and discharging the stored energy springs
● Disconnect auxiliary circuits
● Pull Circuit breaker to maintenance position and remove
See chapter Preparatory work (Page 102)
Accessories
10.18 Shutters
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 223
Installing the shutter - work sequence for frame size I
Control mechanism
① properly
installed
1.
Pull out the guides.
2.
Snap the control mechanism
into place ①.
Place the shutter
②③⑱ on
the lever
⑲ of the control
mechanism
①.
Screw on the cover strip ⑫
.
For 4-pole version only
Accessories
10.18 Shutters
3WT
224 Operating Instructions, 12/2018, 9239 0020 176 06
Attach the upper and lower c
o-
vers
④⑤.
Screw the hook
⑬ onto the
guides.
Accessories
10.18 Shutters
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 225
Installing the shutter - work sequence for frame size II
Control mechanism
① properly
installed
1.
Pull out the guides.
2.
Snap the control mechanism
into place ①.
Place the shutter
⑥⑦ on the
lever
⑲ of the control mecha-
nism
①.
Attach the insulation plate
⑩⑪
and secure.
Accessories
10.18 Shutters
3WT
226 Operating Instructions, 12/2018, 9239 0020 176 06
Attach the upper and lower co
v-
er
⑧⑨.
Screw the hook
⑬ onto the
guides.
Functional check: frame sizes I and II
Move the upper and lower lever ⑲ and ⑳ in the direction of the arrow until the shutter is
open fully. When you let go of the levers, the shutters should close automatically.
Accessories
10.18 Shutters
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 227
Locking the shutter: frame sizes I and II
Note
The following options are available:
•
Both shutters closed
•
The top shutter open
•
The lower shutter open
•
Both shutters open
Two padlocks are required here for each shutter.
These must be provided by the customer.
1. Both shutters closed:
– Insert the guides ② as far as they will go.
– Push the bolt ③ up as far as it will go.
– Place the padlocks in the holes and lock.
2. Upper shutter open:
– Push the upper lever ⑲ up in the direction of the arrow.
– Continue as described above (1).
3. Lower shutter open:
work sequence as described above (2).
4. Both shutters open:
– Move the upper ⑲ and lower ⑳ lever in the direction of the arrow.
– Continue as described above (1).
Accessories
10.19 Arc chute cover
3WT
228 Operating Instructions, 12/2018, 9239 0020 176 06
10.19
Arc chute cover
This is only valid for withdrawable air Circuit breaker.
The cover for arc chute is an accessory for the guide frame, and it provides protection
directly for the switching device above the air Circuit breaker.
Article No.
Description
Article No.
Arc chute cover
Size I, 3P
3WT9811-0GA00
Size I, 4P 3WT9811-0HA00
Size II, 3P
3WT9811-0JA00
Size II, 4P
3WT9811-0KA00
Check contents of package
Item
Description
Withdrawable Circuit breaker
Size I – 3P
Size I – 4P
Size II – 3P
Size II – 4P
①
Side plate left, cpl 1X 1X 1X 1X
②
Side plate right, cpl 1X 1X 1X 1X
③ Protective cover 1X
④
Protective cover 1X
Accessories
10.19 Arc chute cover
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 229
Item
Description
Withdrawable Circuit breaker
Size I – 3P
Size I – 4P
Size II – 3P
Size II – 4P
⑤
Protective cover 1X
⑥
Protective cover 1X
⑦
Countersunk screw M 6X16 4X 4X 4X 4X
⑧
Conical nut M6 4X 4X 4X 4X
⑨
Socket cap screw M 6X16 2X 2X 2X 2X
⑩
Clamping washer 2X 2X 2X 2X
⑪
Hexagon nut M6 2X 2X 2X 2X
Preparatory work
● Opening the Circuit breaker and discharging the stored energy springs
● Disconnect auxiliary circuits
● Pull Circuit breaker to maintenance position and remove
See chapter Preparatory work (Page 102)
Assembly
Take size 1, 3-pole as an example:
● Use allen wrench to dismantle the fasteners ⑬⑭ of the carrier beam ⑫ of the guide
frame, and these fasteners will be kept for use in next steps.
Accessories
10.19 Arc chute cover
3WT
230 Operating Instructions, 12/2018, 9239 0020 176 06
● Take the left and right side plates ①② and insert them from above the Circuit breaker.
● Use allen wrench, screw ⑨, washer ⑩ and nut ⑪ to fix the side plate to the guide
frame.
● Use fasteners ⑬⑭ to fix the carrier beam and both left and right side plates.
Accessories
10.19 Arc chute cover
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 231
● Insert the upper protective cover ③ according to the diagram, making contact with both
left and right side plate ①②. Pay attention that the protective cover should be placed to
inside of side plate corner.
● Use countersunk screw M6x16 ⑦ and conical nut M6 ⑧ to fix the protective cover to
both side plates.
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 233
Troubleshooting
11
Fixed-
mounted
Circuit
breaker
Withdrawa-
ble Circuit
breakers
Fault
Cause
Remedy
✓ ✓ The Circuit breaker cannot be
closed mechanically and/or electri-
cally.
(The Circuit breaker is not ready to
close, ready-to-close indicator ❑)
The stored-energy spring
mechanism has not been
charged.
Charge the stored-energy
spring mechanism.
✓ ✓ The undervoltage release is
not excited.
Connect the undervoltage
release to the power sup-
ply.
✓ ✓ Mechanical reclosing lock-
out active.
Rectify cause of overcur-
rent tripping and press
RESET.
✓ ✓ Electrical closing lockout
active.
Remove the control volt-
age of the closing lockout.
*)
✓ ✓ Mechanical OFF pushbut-
ton locked.
Enable the pushbutton. 2
✓
✓
Block against closing.
1
Close the cabinet door.
✓ ✓ Mechanical Circuit breaker
interlock active (accesso-
ries).
Open the interlocking Cir-
cuit-breaker or rack it to
disconnected position.
2
✓ ✓ Electronic overcurrent re-
lease not installed or in-
stalled incorrectly.
Install the electronic over-
current release properly.
✓ The Circuit breaker is set to
an intermediate position in
the guide frame (note the
position indicator).
Rack the Circuit breaker to
the disconnected, test, or
operating position.
✓ Shutter for racking handle
opening not closed.
Close the shutter (to dis-
connected, test, or operat-
ing position).
✓ ✓ The Circuit breaker cannot be
closed by electrical means.
(The Circuit breaker is ready to
close, ready-to-close indicator OK)
The operating voltage of
the closing solenoid is
incorrect or has not been
applied.
Check that the voltage is
correct or apply the volt-
age.
✓ The circuit breaker is in the
disconnected position in the
guide frame.
Rack the circuit breaker to
the test or operating posi-
tion.
✓ The auxiliary supply con-
nector has been un-
plugged.
Plug in the auxiliary supply
connector.
✓ The guide rails cannot be pulled out
to install the Circuit breaker.
The shutter is locked with
one or two padlocks.
Remove the padlocks.
Troubleshooting
3WT
234 Operating Instructions, 12/2018, 9239 0020 176 06
Fixed-
mounted
Circuit
breaker
Withdrawa-
ble Circuit
breakers
Fault
Cause
Remedy
✓ The Circuit breaker cannot be
switched from the maintenance
position to the disconnected posi-
tion.
The positioning mechanism
of the Circuit breaker is not
in the disconnected position
(note the position indicator).
Rack the positioning
mechanism to the discon-
nected position.
✓ You have attempted to
insert the Circuit breaker in
a guide frame with a differ-
ent rated current.
Only use Circuit breakers
with the same rated current
as the guide frame.
✓ The Circuit breaker and
guide frame are encoded
differently.
✓ When the Circuit breaker is racked
from the disconnected position to
the test position, you encounter a
high level of resistance as soon as
you pass the disconnected position.
The Circuit breaker was not
inserted as far as it will go
and the side latches are not
yet engaged (warning:
danger of destroying the
device).
Push the Circuit breaker to
the disconnected position
as far as it will go. The side
latches must engage.
✓ When you rack the Circuit breaker
from the disconnected position to
the test position, it does not move
for the first eight rotations.
No fault, due to the function Continue racking
✓ The racking handle cannot be in-
serted.
The OFF button has not
been pressed.
Press the OFF button and,
at the same time, move the
slide switch to the right.
✓ The cabinet door is not
completely shut.
Close the cabinet door.
✓ Racking handle opening
locked with padlock(s).
Remove the padlock(s). 1
✓ The cabinet door cannot be opened
(door interlock as accessory).
When the Circuit breaker is
closed, this interlocks the
cabinet door.
Open Circuit breaker
✓ The Circuit breaker is in the
operating position.
Rack the Circuit breaker to
the test position or discon-
nected position.
1
2
Effective when the cabinet door is open (accessory).
Note the following safety information:
Note
Protective device
Override only if permissible under normal operating conditions.
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 235
Dimension drawings
12
The dimensions are measured in unit of mm in this chapter.
12.1
Fixed-mounted Circuit breaker, Frame size I, 3 pole and 4 pole
The broken contour at the side depicts the 4-pole version. For missing dimensions please
see the drawing of horizontal connection.
Horizontal connection
①
Fixing points 4 x press nut M8
⑥
Space above arc chutes
②
Center line of operator panel
⑦
Cabinet door
③
Auxiliary conductor connection system
⑧
Countersunk handle
④
Clearance for lifting out the arc chutes
⑨
Slot (4 mm deep) for phase barriers
⑤
Space for auxiliary supply connector
⑩
Communication Module (optional)
Rated current
a
b
c
d
e
≤ 1250 A, N / S
8
8
8
134.5
265.5
1600 A, N 8 8 8 134.5 265.5
1600 A, S
15
15
20
127.5
272.5
Dimension drawings
12.1 Fixed-mounted Circuit breaker, Frame size I, 3 pole and 4 pole
3WT
236 Operating Instructions, 12/2018, 9239 0020 176 06
Vertical connection
Front connection
Safety distances
No additional safety distance from adjacent, grounded components is required above the
Circuit breaker (on fixed-mounted Circuit breakers marked with "⑥").
The distance between the connection point and bar support must not exceed 250 mm
Up to a rated operating voltage of 440 V AC, the vertical bars (e.g. with front connection)
must not be shielded if the busbar system is not located above the Circuit breaker.
On the other hand, live, bare conductors and bars with voltages in excess of 440 V AC (if
they are located above the Circuit breaker and if the current is supplied from above) must be
protected against flashover by means of phase barriers, bar covers, or arc chute covers
(only use accessories for horizontal or vertical connections).
Optional electrical equipment directly above the Circuit breaker (if arc chutes are not used)
or next to the Circuit breaker should be protected with a cover. Once you have installed
additional phase barriers or covers, you must ensure that heat dissipation from the Circuit
breaker is not impeded.
Dimension drawings
12.2 Fixed-mounted Circuit breaker, Frame size II, 3 pole and 4 pole
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 237
12.2
Fixed-mounted Circuit breaker, Frame size II, 3 pole and 4 pole
The broken contour at the side depicts the 4-pole version. For missing dimensions please
see the drawing of horizontal connection.
Horizontal connection
①
Fixing points 4 x press nut M8
⑥
Space above arc chutes
②
Center line of operator panel
⑦
Cabinet door
③
Auxiliary conductor connection system
⑧
Countersunk handle
④
Clearance for lifting out the arc chutes
⑨
Slot (4 mm deep) for phase barriers
⑤
Space for auxiliary supply connector
⑩
Communication Module (optional)
Rated current
a
b
c
d
e
f
g
630 - 2500 A 15 15 20 122.5 267.5 80 40
3200 A
30
30
20
95
285
100
50
Dimension drawings
12.2 Fixed-mounted Circuit breaker, Frame size II, 3 pole and 4 pole
3WT
238 Operating Instructions, 12/2018, 9239 0020 176 06
Vertical connection up to 3200 A
Vertical connection 4000 A
Front connection
Dimension drawings
12.3 Withdrawable Circuit breaker, Frame size I, 3 pole and 4 pole
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 239
12.3
Withdrawable Circuit breaker, Frame size I, 3 pole and 4 pole
The broken contour at the side depicts the 4-pole version. For missing dimensions please
see the drawing of horizontal connection.
Horizontal connection
①
Holes for securing the guide frame 4 x Ø9
⑥
Disconnected position
②
Center line of operator panel
⑦
Test position
③
Auxiliary conductor connection system
⑧
Connected position
④
Guide frame
⑨
Slot (6 mm deep) for phase barriers
⑤
Cabinet door
⑩
Communication Module (optional)
Rated current
a
b
c
≤ 1250 A, N / S
8
8
8
1600 A, N
8
8
8
1600 A, S
15
15
15
Dimension drawings
12.3 Withdrawable Circuit breaker, Frame size I, 3 pole and 4 pole
3WT
240 Operating Instructions, 12/2018, 9239 0020 176 06
Vertical connection
Front connection
Dimension drawings
12.4 Withdrawable Circuit breaker, Frame size II, 3 pole and 4 pole
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 241
12.4
Withdrawable Circuit breaker, Frame size II, 3 pole and 4 pole
The broken contour at the side depicts the 4-pole version. For missing dimensions please
see the drawing of horizontal connection.
Horizontal connection
①
Holes for securing the guide frame 4 x Ø9
⑥
Disconnected position
②
Center line of operator panel
⑦
Test position
③
Auxiliary conductor connection system
⑧
Connected position
④
Guide frame
⑨
Slot (6 mm deep) for phase barriers
⑤
Cabinet door
⑩
Communication Module (optional)
Rated current
a
b
c
d
e
f
g
630 - 2500 A 15 15 20 137.5 252.5 80 40
3200 A
30
30
20
125
255
100
50
Dimension drawings
12.4 Withdrawable Circuit breaker, Frame size II, 3 pole and 4 pole
3WT
242 Operating Instructions, 12/2018, 9239 0020 176 06
Vertical connection up to 3200 A
Vertical connection 3800 A
Front connection
Dimension drawings
12.5 Accessories 3 pole / 4 pole
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 243
12.5
Accessories 3 pole / 4 pole
Mechanical interlock (1)
Interlocking device that prevents closing (2).
Comprising an interlock in the cabinet and an interlocking module with Bowden wire.
①
Distance for interlocking module
(without Bowden wire)
Distance for
a
b
c
d
e
(1)
90
90
50
65
270
(2)
58
215
10
250
115
Arc chute cover
For withdrawable Circuit breakers only.
②
The dimension of Circuit breaker with arc chute cover
Dimension drawings
12.6 Door cutout 3 pole / 4 pole
3WT
244 Operating Instructions, 12/2018, 9239 0020 176 06
12.6
Door cutout 3 pole / 4 pole
Door cutout for operator panel with door sealing frame
① Mounting surface
* 3 holes, diameter Ø 5.5 mm; only drill if door interlock is used
Door cutout with edge protection
Cutout after edge protection is attached
Cutout when Circuit breaker is installed in cabinet and when door is in central position.
Width of cutout
Fixed-mounted Circuit breaker
b
Withdrawable Circuit breaker
b
400 275 292
500
275
290
600
275
288
Dimension drawings
12.7 Current transformer for N conductor
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 245
12.7
Current transformer for N conductor
Frame size I, 3WL9 111-0AA21-0AA0
Frame size II, 3WL9 111-0AA22-0AA0
Frame size I, 3WL9 111-0AA31-0AA0
Frame size II, 3WL9 111-0AA32-0AA0
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 247
Circuit diagrams
13
13.1
Overall circuit diagram
Accessories in overall circuit diagram
A1
Electronic overcurrent release
S1 / S2
1st auxiliary switch block
S3 / S4 2nd auxiliary switch block
S5 / S6
2nd auxiliary switch block
S5 / S60 2nd auxiliary switch block
S60 / S61
2nd auxiliary switch block
S7
Ready-to-close signaling contact
S11
Trip signalling
ON
Mechanical ON
OFF
Mechanical OFF
F1
Shunt release or electrical closing lockout
F2
Shunt release
F3
Undervoltage release
F8
Undervoltage release with delay
F5
Tripping solenoid
M1
Motor for charging stored-energy spring mechanism
P
Stored-energy spring mechanism
R
Display and reset plunger for overcurrent tripping
Q01
Spring charging lever for spring energy store
Q1
Main contacts
T1 / T2 / T3
Current transformers
X100 / X200 / X300 / X400 Connecting terminals
Y1
Closing solenoid
BSSWT Breaker Status Sensor, BSSWT
V-Tap
V-Tap
COM16WT
Communication module COM16WT
Circuit diagrams
13.1 Overall circuit diagram
3WT
248 Operating Instructions, 12/2018, 9239 0020 176 06
Circuit diagrams
13.2 Circuit diagram for undervoltage release with delay
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 249
13.2
Circuit diagram for undervoltage release with delay
Circuit for EMERGENCY OFF function
(instant OFF when S15 is open)
Circuit without EMERGENCY OFF function
S15 =
external instant OFF
S16 =
external delayed OFF
Circuit diagrams
13.3 Terminal diagrams
3WT
250 Operating Instructions, 12/2018, 9239 0020 176 06
13.3
Terminal diagrams
The following overview shows which part of the internal equipment is connected to which
part of the contact blocks, i.e. this is a complete auxiliary wiring diagram of the Circuit
breaker.
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 251
Glossary
Auxiliary trip unit
Undervoltage releases and shunt releases are available.
BSSWT
Breaker Status Sensor for 3WT for collecting circuit breaker status information via signalling
switches and transmitting these data to the CubicleBUS.
Closing solenoid
Electrical closing of the energy in the spring energy store.
COM16WT
Communication module for 3WT.
Electrical closing lockout
This function is designed to electrically interlock two or more Circuit breakers (closing
lockout). The electrical closing lockout prevents the Circuit breaker from closing with a
continuous signal.
Energy transformer
Generates energy (power supply) for the internal supply of the overcurrent release.
Finger contacts
These connect the main terminals on the Circuit breaker to the main terminals on the guide
frame.
Manual connector coding
The manual connectors can be coded to prevent the auxiliary conductor connectors from
being connected incorrectly.
Mechanical interlock
This function supports different types of mechanical interlocking for Circuit breakers.
Glossary
3WT
252 Operating Instructions, 12/2018, 9239 0020 176 06
Mechanical reclosing lockout
After overcurrent tripping, the Circuit breaker is locked against reclosing until the mechanical
reclosing lockout function has been manually reset.
Motorized operating mechanism
A geared motor automatically charges the stored-energy spring mechanism as soon as
voltage has been applied to the auxiliary supply connections. After one closing operation, the
stored-energy spring mechanism is automatically charged for the next closing operation.
Position indicator
This indicates the position of the Circuit breaker (disconnected/test/operating position) in the
guide frame.
Position signaling switch
This is used for remotely displaying the Circuit breaker position in the guide frame.
Powerconfig
Software for commissioning and service, free of charge available at:
www.siemens.com/powerconfig-download
powerconfig is used as a shared commissioning and maintenance tool for the circuit
breakers with communication capability. It offers a standardized interface and a uniform
operator control concept for the activities to be carried out, such as
- Parameterizing
- Operating
- Monitoring, and
- Diagnosing.
"3WT air circuit breaker with communication capability-Modbus", please see:
https://support.industry.siemens.com
Racking rail
Accommodates the Circuit breaker in the guide frame.
Rated current coding
The rated current is coded in the factory, that is, each Circuit breaker can only be used in a
guide frame with the same rated current.
Glossary
3WT
Operating Instructions, 12/2018, 9239 0020 176 06 253
Safe OFF
This additional function prevents the Circuit breaker from closing and fulfills the isolation
condition in the OFF position to IEC 60947-2:
● "Mechanical OFF" button pressed
● Main contacts open
● Withdrawable Circuit breakers: racking handle removed
● The various interlocking conditions are fulfilled
Shunt release (F1, F2)
For remotely opening the Circuit breaker and blocking it against closing.
Shutters
Shutters are molded-plastic plates for covering live main conducting paths in the guide frame
(shock-hazard protection). If the Circuit breaker is racked to the disconnected position, the
shutters are moved over the uncovered contact gaps.
Spring charging lever
The stored-energy spring mechanism is charged by means of a series of pump movements
(five actuations of charging lever).
Stored-energy spring mechanism
Unit with spring energy store (mechanical energy). The spring is charged by means of the
spring charging lever or motorized operating mechanism and maintained in a charged state
by means of latches. When these latches are released, the stored energy is routed to the
switching contact and the Circuit breaker closes.
Switching position signaling switch
This auxiliary switch is actuated depending on the switching status of the Circuit breaker.
Tripped signaling switch
Group signal for overload, short-circuit, and ground-fault tripping by means of microswitch.
Undervoltage release (delayed)
For remotely opening and interlocking the Circuit breaker. Voltage dips must not cause the
Circuit breaker to open.
Glossary
3WT
254 Operating Instructions, 12/2018, 9239 0020 176 06
Undervoltage release (instantaneous/short-time delay)
For remotely opening and interlocking the Circuit breaker as well as for using the Circuit
breaker in EMERGENCY OFF circuits (to EN 60204-1 / DIN VDE 0113 Part 1) in conjunction
with a separate EMERGENCY OFF device. Brief voltage dips (td < 80 ms for instantaneous
undervoltage release, td < 200 ms for short-time delay undervoltage release) must not cause
the Circuit breaker to open.
Use of tools
Buttons located under a cover and that can be accessed through a hole (diameter 6.35 mm)
can only be actuated by means of a suitable rod.
