© Siemens AG 1996. All rights reserved.
3AH47
Vacuum circuit-breaker
17.5 kV - 16.7 Hz and 27.5 kV - 50/60 Hz
OPERATING INSTRUCTIONS
Order no.: 9229 9947 176 0C
Ordering location: IC LMV LP PO P C41
AG 03.2013 en
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For your safety
Signal terms and
definitions Hazards are classified in accordance with ISO 3864-2 using the following keywords:
• DANGER, WARNING or CAUTION, where there is a risk of personal injury
• NOTE, where there is a risk of material damage.
Hazards are classified and indicated in the operating instructions and on the vacuum
circuit-breaker as follows:
Qualified personnel are, for the purposes of this manual or the warning indication on the vacuum circuit-
breaker, persons who are familiar with the transport, storage, placement, assembly,
commissioning, operation and maintenance of the product and have the
qualifications corresponding to their activity, such as:
• training and authorisation to energize, de-energize, clear, ground and tag
circuits and equipment in accordance with established safety practices.
• training in the proper care and use of protective equipment in accordance with
established safety practices;
• training in providing first aid.
Product liability
DANGER
signal word used to indicate an imminently hazardous situation which,
if not avoided, will result in death or serious injury.
WARNING
signal word used to indicate a potentially hazardous situation which,
if not avoided, could result in death or serious injury.
CAUTION
signal word used to indicate a potentially hazardous situation which,
if not avoided, could result in minor or moderate injury.
Note
indicates a potentially damaging situation.
If the damaging situation is not avoided, the product or something in its vicinity
may sustain damage.
Note
Product liability claims are upheld only if the replacement of the purchased spare
parts is performed by personnel that has been trained and certified by Siemens.
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Table of contents
For your safety ................................................................................................................................................... 2
Transport, storage and packing .................................................................................................................. 5
Transport ............................................................................................................................................................. 5
Unpacking (I) ....................................................................................................................................................... 6
Unpacking (II) .................................................................................................................................................... 10
Reusing the transport unit ................................................................................................................................. 12
Storage ............................................................................................................................................................. 12
General information ....................................................................................................................................... 13
Range of application ......................................................................................................................................... 13
Standards .......................................................................................................................................................... 14
Design approval as per X-Ray Ordinance ........................................................................................................ 14
Scope of delivery .............................................................................................................................................. 14
Description ........................................................................................................................................................ 15
Design ............................................................................................................................................................... 15
Interlocking devices .......................................................................................................................................... 29
Rating plate ....................................................................................................................................................... 31
Technical data ................................................................................................................................................... 31
Ambient conditions ............................................................................................................................................ 32
Installation altitudes .......................................................................................................................................... 32
Switching times ................................................................................................................................................. 33
Circuit diagrams ................................................................................................................................................ 34
Installation ......................................................................................................................................................... 39
Attachment in the switching cubicle .................................................................................................................. 39
Earthing ............................................................................................................................................................. 41
Electrical connection of the prime conductor .................................................................................................... 43
Operation ............................................................................................................................................................ 45
Commissioning ................................................................................................................................................. 45
First closing operation ....................................................................................................................................... 46
Closing .............................................................................................................................................................. 47
Opening ............................................................................................................................................................ 47
Maintenance ...................................................................................................................................................... 49
Maintenance and servicing ............................................................................................................................... 49
Maintenance plan .............................................................................................................................................. 50
Vacuum interrupter service life ......................................................................................................................... 54
Accessories and spare parts ............................................................................................................................. 54
Manufacturer's product liability .......................................................................................................................... 55
Disposal ............................................................................................................................................................ 55
Service .............................................................................................................................................................. 55
Index of keywords .......................................................................................................................................... 57
Legend for all pages ...................................................................................................................................... 59
Note
Sections with Addendum (I) or (II)
Sections with Addendum (I) are about the standard equipment. Sections with Addendum (II) relate only to vacuum
circuit-breakers with two vacuum-interrupters connected in series. If no addendum is given, the information is
applicable for all 3AH47 vacuum circuit-breakers.
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Blank page
Transport, storage and packing
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Transport, storage and packing
Transport
Transport weight Refer to the delivery slip for the weight of the transport unit.
Place the transport unit on a level, non-slip and pressure-resistant surface for
intermediate storage.
Transport vacuum circuit-breaker in the original transport unit up until installation site
or storage location.
Transport with crane or fork lift
WARNING
Heavy transport weight
Transport unit may fall and fail and sling gear may break.
Use means of lifting, transporting and sling gear suited to the requirements and
load-carrying capacity. Observe transport symbols.
Note
Observe stac king height
For transport, not more than three constructionally identical transport units must
be piled on top of each other.
Observe loads specified on the transport unit.
Note
Secure load
For transport secure load in such a way that the transport unit is not at risk.
Fig. 1 Transporting the pallet with carton (I) Fig. 2 Transporting the pallet (II)
Transport, storage and packing
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Transport with packing Transport the transport unit to the installation site or storage location
• with a fork lift or
• with sling gear suspended from a crane
- at an angle of twist of approx. 60° or
- with a spreader bar.
After receipt of delivery:
Checking the transport
unit • Check transport unit for damage;
• Major damage must be documented photographically.
• Ensure that any damage to the transport unit is confirmed by the transport
company.
Unpacking (I)
Working equipment Required tools:
- Knife/scissors
- Lifting equipment with lifting gear
- Pliers or lever
CAUTION
Danger of injury from sharp edges!
Fasteners may break, leaving sharp edges.
Always use a suitable tool to lever out fasteners.
Note
Do not cut open or damage carton, since it is designed to be reused and
because of the belt strap s located underneath.
Belt straps could be severed on the pallet floor when cutting open the carton.
The vacuum circuit-breaker is attached to the pallet with belt straps. It is not
possible to transport the vacuum circuit-breaker on the pallet without using belt
straps (see Fig. 5).
Fig. 3 Removing the carton
Transport, storage and packing
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Opening the transport unit • Place the transport unit on a level, non-slip and pressure-resistant surface.
• Remove lifting gear or transport means.
• Remove plastic wrap.
• Lever out fasteners from the carton and lift off carton.
• Remove foil.
• Check delivery for completeness.
• Check vacuum circuit-breaker for damage.
• If the vacuum circuit-breaker is damaged, ship it back in the transport unit (see
“Reusing the transport unit”, page 12).
Transport with pallet,
without carton The vacuum circuit-breaker can be transported with the pallet, without the carton.
• Thread carrying belts under the pallet or
• Transport with fork lift.
Note
Do not use the vacuum circuit-breaker if parts are broken, i.e. if you find cracks,
flakings, bent metal parts, damaged plug-in contacts, tears or bare cables.
Send it back in its original transport unit (see “Reusing the transport unit”,
page 12).
Note
Carrying straps may scrape along the vacuum circuit-breaker and damage it.
If necessary, cover carrying straps with edge protection.
Select length and position of the carrying straps so that the pole heads are not
compressed.
Fig. 4 Removing the foil Fig. 5 Transport with pallet possible
Transport, storage and packing
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Transport without pallet • Remove all tensioning belts and bits of fastening wood.
• Remove accessory pack, if applicable, and store safely in the packaging for
later attachment.
• Screw suitable eye bolts into the pole heads.
• Hang sling gear into the eyebolts.
• Carefully lift vacuum circuit-breaker off the pallet just enough that pieces of
square timber can be placed underneath.
Note
When fastening the eyebolts to the pole heads, ensure that the contact surfaces
are not damaged.
Fig. 6 Removing the tensioning belts Fig. 7 Screwing in eye bolts and lifting the vacuum
circuit-breaker
Note
Place pieces of square timber onto the pallet in such a way that the insulating
operating rods, contact pressure springs, angle levers and dashpots are not
damaged when setting down.
Transport, storage and packing
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• Set the vacuum circuit-breaker down onto the square timbers.
• Hang further sling gear into the transport boreholes.
• Transport to installation site or suspended from crane for further work steps.
Fig. 8 Positioning the square timbers and setting
down the vacuum circuit-breaker
Fig. 9 Transporting without pallet
Note
Keep accessory pack on hand for the installation.
Transport, storage and packing
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Unpacking (II)
Working equipment Required tools:
- Knife/scissors
- Lifting equipment with lifting gear.
Opening the transport unit • Place the transport unit on a level, non-slip and pressure-resistant surface.
• Remove lifting gear or transport means.
• Remove foil.
• Check the vacuum circuit-breaker for damage.
• Remove all tensioning belts and bits of fastening wood.
• Remove timber between pole plate and beam.
• Hook crane hooks into the openings on the mechanism box.
• Carefully lift vacuum circuit-breaker.
Note
Do not use the vacuum circuit-breaker if parts are broken, i.e. if you find cracks,
flakings, bent metal parts, damaged plug-in contacts, tears or bare cables.
Send it back in its original transport unit (see “Reusing the transport unit”,
page 12).
Fig. 10 Removing foil Fig. 11 Removing tensioning belts and bits of
fastening wood
Fig. 12 Removing squared timber Fig. 13 Lifting
Transport, storage and packing
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Transport to the
installation site • Grab the vacuum circuit-breaker on the pole head with both hands.
• Position the pole plate on the rear end of the beam.
• Lift the vacuum circuit-breaker with lifting gear and both hands and guide into
the transport position.
• Transport to installation site or leave suspended from crane for further work
steps.
CAUTION
Crushing ha zard!
The vacuum circuit-breaker can tip during lifting and crush hands. Do not reach
between pole head and beam.
Reposition the vacuum circuit-breaker.
Wear helmet and gloves.
Note
The vacuum circuit-breaker has a tilted transport position because the centre of
gravity is situated outside of the mechanism box.
Fig. 14 Positioning and lifting Fig. 15 Transport position
Note
Keep accessory pack on hand for the installation.
Transport, storage and packing
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Reusing the transport unit
Reusing the transport unit To transport the vacuum circuit-breaker again, the pallet with carton or the case with
the most components can be reused.
Do not reuse severed tensioning straps or plastic wrap.
Pack the vacuum circuit-breaker in reverse order:
• Attach the vacuum circuit-breaker safely to the pallet using the appropriate
tools.
• Cover with foil and seal with adhesive tape.
• Attach accessories pack.
• Attach carton securely to the pallet base.
• Screw the wooden case back together.
• Before returning to the factory, ask the responsible Siemens representative for a
returned goods number (see also “Service”, on page 55).
• When returning a vacuum circuit-breaker, always indicate the type and serial
number (see “Rating plate”, on page 31).
Storage
* without carton
Note
Store the vacuum circuit-breaker in the following condition:
• OPEN position
• Closing spring relaxed
Note
Risk of corrosion damage if stored improperly!
If the storage conditions listed below are met, the vacuum circuit-breaker can be
stored for up to a year in its transport unit.
If the storage conditions are not met, the vacuum circuit-breaker cannot be stored
in the transport unit any longer than 6 months.
If storage of longer than one year is planned, unpack the vacuum circuit-breaker
from the transport unit. Further storage may necessitate fresh corrosion
protection, and it must be ensured that the vacuum circuit-breaker cannot be
damaged.
Storage room Transport unit Storage
time Temperature
range Comments Number of
units per
stack
Enclosed, dry, well
ventilated and as
free from dust as
possible, with a
relative humidity of
less than 60 %.
unopened max.
6months –40°C to +55°C — max. 4
unopened max.
1year –5 °C to +40 °C — max. 4
open * over 1year –5°C to +40°C
if necessary
with new
corrosion
protection
—
General information
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General information
Smooth and safe operation of this device requires proper transport and storage, and
professional installation and assembly as well as careful operation and
maintenance.
The basic version and all listed configurations of the vacuum circuit-breakers are
type-tested devices as per IEC.
Range of application
3AH47 vacuum circuit-breakers are one-pole or two-pole interior circuit-breakers for
a rated voltage of 17.5 kV - 27.5 kV.
3AH47 vacuum circuit-breakers can handle up to 60 000 operating cycles if the
maintenance schedule is observed.
Intended use 3AH47 vacuum circuit-breakers are suitable for switching any type of alternating
current circuits under normal operating conditions, such as:
• Three-phase motors for reversing, turning and direct operation
• Transformers
• Capacitors
• Resistor consumers
Suitable for high frequency of operation and unlimited on-time.
3AH47 vacuum circuit-breakers operate in continuous, periodic and short-time
operation.
WARNING
Dangerous voltage and mechanical movements
When operating electrical devices, certain parts will always be live, and
mechanical parts may move very quickly, even when remotely controlled.
If the warnings are not observed, serious injury or damage to material may be the
result.
Only personnel with the relevant qualifications may work on or in the vicinity of
this device. This personnel must be familiar with all the warnings and servicing
measures specified in these operating instructions.
Note
In the event of subsequent attachments or fittings, e. g. locking parts in
connection with switchgear, ensure that
• fast moving parts are not additionally loaded by masses or forces and
• additional parts are sufficiently far away especially from moving and live
parts.
If vacuum circuit-breakers are to be equipped with additional functions by the
customer, we recommend consulting the factory, since tried and tested solutions
are frequently available (see also “Additional equipment”, on page 19).
General information
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Standards
The 3AH47 vacuum circuit-breakers comply with the regulations:
• IEC 62271-100
• IEC 62271-1
• IEC (DIN EN) 60265-1
All 3AH47 vacuum circuit-breakers comply with the specifications for C2-, E2- and
M2-class circuit-breakers in accordance with IEC 62271-100.
Design approval as per X-Ray Ordinance
The vacuum interrupters installed in the vacuum circuit-breakers are of a design
approved under the X-Ray Ordinance (RöV) of the Federal Republic of Germany.
They meet the requirements of RöV of 8 January 1987 (BGbl. I, page 114) § 8 and
Annex II No. 5 up to the level of the rated voltage stipulated according to DIN
VDE/IEC.
Scope of delivery
Delivery includes:
• 3AH47 vacuum circuit-breaker
• Hand crank for circuit-breaker 3AX 1530-2B (optional)
• Operating instructions + unpacking instructions
• Circuit-breaker-specific circuit diagrams
Description
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Description
Design
The 3AH47 vacuum circuit-breakers differ in their outer design:
• One-pole with two vacuum interrupters arranged one above the other
• One-pole with a vacuum interrupter
• Two-pole with one vacuum interrupter per pole
The basic design as well as the operating mechanisms are the same for all types of
construction.
Vacuum circuit-breaker The 3AH47 vacuum circuit-breaker consists of
• the mechanism box (60.),
• the pole assembly (19.) with vacuum interrupter (30.),
• the cast resin post insulators (16.1 and 16.2) with reinforcing struts (28.)
• the insulating operating rods (48.) with contact pressure springs (49.) required
for contact actuation.
Each pole assembly (19.) is carried by the cast resin post insulators (16.1 and 16.2)
that are screwed to the pole plate (15.).
Fig. 16 Side view
15. Pole plate 30. Vacuum interrupter
16.1 Upper post insulator 48. Insulating operating rod
16.2 Lower post insulator 49. Contact pressure spring
19. Pole assembly, complete 60. Mechanism box
28. Strut
Description
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Pole assembly The pole assembly (19.) of the 3AH47 vacuum circuit-breaker consists of
• the upper interrupter support (20.)
• with the upper terminal (27.)
• of the vacuum interrupter (30.);
• the lower interrupter support (40.) with the lower terminal (29.) and the clamp
(29.2) with flexible connector (29.1);
• as well as the angle lever (48.6.).
The centering (28.1) and the struts (28.) relieve the vacuum interrupters of external
forces.
Fig. 17 Pole assembly 3AH47 84 Fig. 18 Pole assembly 3AH47 57
19. Pole assembly 30. Vacuum interrupter
20. Upper interrupter support 38. Grading capacitor
27. Upper terminal 39. Pole gearing
28. Strut 39.1 Bearing block
28.1 Centering 40. Lower interrupter support
29. Lower terminal 48.6 Angle lever
29.1 Flexible connector 49. Contact pressure spring
29.2 Clamp
Description
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Contact system in the vacuum interrupters
A slight change in the contact stroke that occurs over the entire useful life of the
vacuum interrupter has no effect on its function. There is no need for a status
indicator for the contact system.
Mechanism box The mechanism box (60.) contains all the electrical and mechanical components
required to switch the vacuum circuit-breaker on or off. Insulating operating rods
(48.) transfer the switching movement to the pole assemblies.
The mechanism box is closed with a removable cover (60.1).
There are openings in the cover (60.1) for the operating and indicator elements.
Functions The CLOSED pushbutton (53.) is used to close the vacuum circuit-breaker. The
motor (50.4) immediately charges the closing spring (62.). If the supply voltage for
the motor fails, the closing spring can be charged with a hand crank (50.). There is
an opening (50.1) for this in the cover, behind which you will find the hand crank
coupling (50.5) of the gear unit (50.2). The OPEN pushbutton (54.) is used to open
the vacuum circuit-breaker.
Indicators The charged state of the springs is indicated via the spring state indicator (55.). The
position indicating device (59.) shows the CLOSED or OPEN state. The operating
cycle counter (58.) indicates the number of operating cycles. An operating cycle
consists of one closing and one opening. The rating plate (51.) is attached to the
mechanism box and readable through an opening (51.1) in the cover.
Fig. 19 Operating and indicator elements
50.1 Opening for hand crank 58. Operating cycle counter
51. Rating plate 59. Contact position indicator CLOSED-OPEN
53. CLOSED pushbutton 60.1 Cover
54. OPEN pushbutton a) Tightening torque Md = 10 Nm
55. Spring state indicator
Description
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Fig. 20 Opened mechanism box
50.2 Gear unit 59. Contact position indicator CLOSED-OPEN
50.4 Motor M1 60. Mechanism box
50.4.1 Position switch 61. Dashpot
50.5 Hand crank coupling 62. Closing spring
51. Rating plate 63. Circuit-breaker shaft
53.1 Closing solenoid Y9 64. Opening spring
54.1 Shunt release Y1 66. Closing damper
54.2 Shunt release Y2 or 68. Auxiliary switch S1
Instantaneous release H83 Opt. Y2 68.1 Operating rod (for auxiliary switch S1)
54.3 Transformer-operated releases Y4, Y5 68.7 Low-voltage interface X0
54.4 Undervoltage release Y7 69. Contactor relay K1
54.5 Transformer-operated release (0.1
Ws) Y6
70. Earth terminal
55. Spring state indicator 71. Heater (condensation water protection)
58. Operating cycle counter
Description
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Equipment
Basic equip m en t The basic equipment of the 3AH47 vacuum circuit-breaker contains:
Additional equipment Every 3AH47 vacuum circuit-breaker can be fitted with the following equipment:
In addition to the serial shunt release (Y1), the vacuum circuit-breaker can be
equipped with a maximum of 2 releases of the type 3AX11.
For the permitted possible combinations of the additional equipment as well as
special designs, refer to catalogue HG11, or contact the responsible Siemens
representative.
Motor (M1)
Contactor relay (electrical anti-pumping device) (K1)
Closing solenoid (Y9)
Shunt release (Y1)
Auxiliary switch (optional) (S1)
•6NO + 6NC
•12NO + 12NC
Position switch for signal "Closing spring charged" (S41, S42)
Circuit-breaker tripping signal, cut-out switch (S6, S7)
Low-voltage interface (optional) X0
• Plug-connector with sleeve housing 64-pin
• Plug-connector with sleeve housing 24-pin
• Terminal strip
Operating cycle counter
Mechanical anti-pumping device
Mechanical manual closing and opening
Shunt release1) 3AX1101
1) Subsequent installation possible
(Y2, Y3)
Transformer-operated release 3AX11021) (Y4, Y5)
Transformer-operated release 3AX1104 (0.1 AC)1) (Y6)
Undervoltage release 3AX11031) (Y7)
Instantaneous release H83 Opt. 3AX601 (Y2)
Heater (condensation water protection)1)
Mechanical interlock1)
Electric manual closing2)
2) No subsequent installation possible
Priority opening2)
Description
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Motor (M1)
*) The operator's supply voltage may deviate from the rated supply voltage of the
vacuum circuit-breaker by -15 % to +10 %.
**) Built-in automatic circuit-breaker with C characteristic
Fig. 22 Recommendation for motor protection device
Contactor relay K1
After the supply voltage is applied and if the closing
spring is relaxed, the motor starts immediately and is
automatically deactivated internally after charging has
taken place.
Power consumption, maximum:
• in the event of direct voltage approx. 750 W
• in the event of alternating voltage approx. 1400 VA.
In the short charging time, the motor sometimes
operates in the overload range. See Fig. 22 for the rated
voltage for the required motor short-circuit protection.
Note: The motor protection devices are not included in
the delivery of the vacuum circuit-breaker and must be
ordered separately.
Fig. 21 Motor (50.4)
Rated supply voltage U*) V
DC
24
DC
48
DC
60
DC
110
AC 50/60 Hz
110
DC
220
AC 50/60 Hz
230
Recommended rated current of the protective
device I**)A16106462 3
If simultaneous CLOSE and OPEN commands are
continuously applied to the vacuum circuit-breaker, it
returns to the open position after being closed.
Via the function of the contactor relay K1, the vacuum
circuit-breaker pauses there until the CLOSE command
is given again.
This prevents continuous closing and opening
(pumping).
Fig. 23 Contactor relay (69.)
Description
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Closing solenoid (Y9) 3AY1510
1st shunt release (Y1) 3AY1510
The closing solenoid Y9 unlatches the charged closing
spring and switches the vacuum circuit-breaker on
electrically. It is available for DC or AC voltage.
The closing solenoid Y9 is not designed for continuous
operation and is automatically deactivated within the
circuit-breaker.
The operator's supply voltage may deviate from the
rated supply voltage of the vacuum circuit-breaker by –
15 % to +10 %.
The closing solenoid Y9 can be operated using AC or DC
voltage and is protected against overvoltage.
Power consumption is approximately 140 W / VA
Fig. 24 Closing solenoid (53.1)
In the case of the 1st shunt release Y1, the electrically
fed tripping pulse is passed to the "OPEN" latch by
means of a directly acting magnet armature, thus
switching off the vacuum circuit-breaker.
The 1st shunt release Y1 is not designed for continuous
operation and is automatically deactivated within the
circuit-breaker.
The operator's supply voltage may deviate from the
rated supply voltage of the vacuum circuit-breaker by –
30 % to +10 % in the event of DC voltage and by –15 %
to +10 % in the event of AC voltage.
The 1st shunt release Y1 can be operated using AC or
DC voltage and is protected against overvoltage.
Power consumption is approximately 140 W / VA
Fig. 25 1st shunt release (54.1)
Description
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Auxiliary swit ch S1
Breaking capacity
Fig. 27 Breaking capacity of the auxiliary switch 3SV92
Three versions of the auxiliary switch S1 are available for
delivery: with 6 or 12 NO / NC contacts each.
Rated insulation voltage: 250 V AC/DC
Insulation group: C as per VDE 0110
Continuous current: 10 A
Closing capacity: 50 A
Fig. 26 Auxiliary switch (68.)
AC 40 to 60 Hz DC
Operating voltage Operating current Operating voltage Operating current
U (V) I (A) U (V) I (A)
Ohmic load Inductive load
(T = 20 ms)
Up to 230 10
24 10 10
48 10 9
60 9 7
110 5 4
220 2.5 2
Description
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Position switch
Circuit-breaker tripping signal, cut-out switch (S6, S7)
S21, S22 Position switches (switch off the motor after
charging)
S3 Position switch (opens when closing spring
is charged)
S41, S42 Position switches (report charging state)
Fig. 28 Position switch (50.4.1)
The position switch S6 makes contact briefly when the
vacuum circuit-breaker is opened by means of an
electrical release.
This contacting can be used for a signal.
In the event of intentional mechanical opening, the cut-
out switch S7 interrupts the contacting.
Fig. 29 Circuit-breaker tripping signal
Description
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Low-voltage interface X0, 64-pin
For connection of the control line, the standard version of the vacuum circuit-
breakers are equipped with a 64-pin low-voltage interface X0 (68.7).
The 64-pin plug (68.7.1) for the external terminal, is suitable for crimp termination of
control lines with a nominal cross-section of 1.5 mm2.
Terminal strip (optional) Instead of the 64-pin plug (68.7.1), a terminal strip (68.7.2) can be ordered as
interface to the terminal at the customer's site. Assignment of the terminals is done
according to the circuit diagram supplied.
Fig. 30 Low-voltage interface X0 Fig. 31 Terminal strip (optional)
Description
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A further shunt release, transformer-operated release, undervoltage release or
instantaneous release can be installed as a 2nd release.
2nd shunt release (Y2) 3AX1101
Transformer-operate d releases (Y4, Y5) 3AX1102, (Y6) 3AX1104
The second shunt release Y2 is installed whenever more
than one shunt release is needed.
In this version, the electrical “off” command is passed by
means of a magnet armature to the "OPENING" latch by
release of an energy storage mechanism, thus switching
off the vacuum circuit-breaker. This tripping solenoid is
not designed for continuous operation. Any necessary
varistors and rectifiers are integrated in the release.
Power consumption is approximately 60 W / VA
Fig. 32 2nd Shunt release (54.2)
The transformer-operated releases Y4, Y5 or Y6 consist
of an energy storage mechanism, an unlatching fixture
and an electromagnetic system. If the tripping current is
exceeded (90 % of the transformer-operated release's
rated current), the stored energy mechanism is
unlatched, thus initiating opening of the circuit-breaker.
For use of the transformer-operated release, matching
transformers are also needed for matching, in addition to
the main current transformers.
Power consumption for 0.5 A and 1 A ≤ 6 VA at ≤90 %
of the transformer-operated release's rated current and
with open armature.
Fig. 33 Transformer-operated releases (54.3)
Description
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Undervoltage release (Y7) 3AX1103
The undervoltage release Y7 has an electromagnet system that has voltage
permanently applied to it when the vacuum circuit-breaker is in the closed state. If
the voltage drops below a certain value, the undervoltage release Y7 is unlatched,
thus initiating opening of the vacuum circuit-breaker via the stored energy
mechanism.
Random tripping of the undervoltage release Y7 is generally performed by an NC
contact in the tripping circuit, but can also be done with the aid of an NO contact by
short-circuiting the solenoid coil. In the case of this latter method, the solenoid coil's
short-circuit current is limited by the built-in resistor.
The undervoltage release Y7 can also be connected to voltage transformers.
The undervoltage release Y7 automatically trips the vacuum circuit-breaker if the
rated supply voltage drops to an inadmissible value. Any necessary varistors and
rectifiers are integrated in the release.
Power consumption ≤6.5 W or ≤7.5 VA
Note
The undervoltage release Y7 must only be operated with the supplied series
resistor R1.
Note
For switching operations (mechanical or electrical), the undervoltage release
3AX1103… must be connected to control voltage, as otherwise closing is not
possible.
Fig. 34 Undervoltage release (54.4) Fig. 35 Typical circuit for connection of the
undervoltage release Y7
R1 resistor
S1 auxiliary switch
Y7 undervoltage release
Description
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Instantaneous release H83 Opt. (Y2) 3AX601
The instantaneous release H83 Opt. is a protection relay and was specially
developed for use in vacuum circuit-breakers with 16 2/3Hz for rail applications, in
order to achieve the shortest possible break time.
Since the arcing time in rail networks is three times longer, the use of a special
protection relay together with the rapid release is intended to produce a statistical
short-circuit cut-off already after a half-wave.
Closing time Due to its type of construction and the materials used, it has an extremely short
operating time of < 10 ms, at a very small magnet stroke of 2.5 mm.
For use in the 3AH47 vacuum circuit-breaker a dynamic method of working is
therefore selected:
Because the tripping stroke is not sufficient for static tripping of the opening
latch, a tripping lever is quickly accelerated and actuates the latch with its kinetic
energy.
Break time With the instantaneous release (54.2), the vacuum circuit-breaker reaches break
times of no more than 20 ms, the vacuum circuit-breakers for rail applications
especially designed for this purpose reach even < 17 ms.
Fig. 36 Instantaneous release H83 Opt.
Actuation The low internal resistance of the tripping coil normally does not allow direct
operation at the supply voltage because the large current levels in particular from
auxiliary switches cannot be controlled. The release is thus fed from a capacitor
bank with an electrolytic capacitor connected in parallel. This provides several
advantages:
• The supply system only has to make available the minimal charging current.
• Because of the physical proximity of the capacitors to the release, only minimal
voltage losses occur.
• The auxiliary switch only needs to shut off the residual current of the almost
discharged capacitors after tripping has occurred.
Transistor switch
(MOSFE T) as a co u p lin g
device
Nevertheless, the closing circuit is loaded with the high tripping current – in particular
at 60 V. With a protection relay that is set up very far away, unreliable line losses
can therefore occur. Therefore, a faster transistor switch (MOSFET) must be used
as a coupling device, which increases the response time by only a few μs and must
always be used at 60 V.
This tripping solenoid is not designed for continuous operation and can be ordered
for voltage levels 60 V DC, 110 V DC and 220 V DC.
Description
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Heater (condensation water protection)
Electrical manual closing/electr. locking device
In the basic version, the vacuum circuit-breaker with on-site connection is closed by
direct mechanical unlatching of the closing spring. Instead of this mechanical
manual closing , "electrical manual closing" is also available.
In this version, the closing circuit of the vacuum circuit-breaker is electrically
actuated by a sensing device and must also be enabled via a command element
from the control room.
With on-site closing, this permits taking into account system-related interlocking and
allows you to prevent unintentional closing by the control room, for example. This
allows for interlocking the vacuum circuit-breaker, for example, via the auxiliary
contact of a disconnector.
Vacuum circuit-breakers with electrical manual closing cannot be switched
mechanically.
Note
When an instantaneous release H83 Opt. is used, no 3rd release can be ordered
and used.
The capacitor tripping unit 3AX1550 and the transistor switch (MOSFET) are not
included in the scope of supply and must be ordered separately.
The heater limits condensation and corrosion of the
vacuum circuit-breaker.
To this end, the heater has to be connected to the supply
voltage (see circuit diagram included with the delivery).
The surface temperature of the heater is maximum
180 °C.
Power consumption 50 W
Fig. 37 Heater (71.)
Description
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Interlocking devices
To lock vacuum circuit-breakers as a function of the switching position, the spring
drive mechanisms of the vacuum circuit-breaker can be equipped with an
interlocking device. This is also the case for vacuum circuit-breakers on switch gear
trucks, in withdrawable sections or with disconnectors.
Conditions The vacuum circuit-breaker must be closable only in the operating or disconnected
position (position of the vacuum circuit-breaker on the switchgear truck or
withdrawable section in the switchgear). At the same time, the vacuum circuit-
breaker may be moved on the switchgear truck or withdrawable section only when
it is open.
Positions of th e vac uu m circuit-br ea ke r in th e sw it ch g e ar
Disconnected position The isolating distance between the vacuum circuit-breaker contacts and the
switchgear counter-contacts is attained fully.
Operating position The circuit-breaker is inserted fully into the switchgear and the vacuum circuit-
breaker contacts overlap completely with the switchgear counter-contacts.
Mechanical interlock (optional with spring drive mechanism)
An interrogation and actuation component (b) on the system side scans the
operating position (CLOSED/OPEN) of the vacuum circuit-breaker.
CLOSED position If the vacuum circuit-breaker is closed, actuation of the system's interrogation and
actuation component (b) is prevented. A mechanical system in the switchgear truck
or withdrawable section reliably blocks movements of the circuit-breaker on the
switchgear truck or withdrawable section.
OPEN position If the vacuum circuit-breaker is open, the interrogation and actuation component (b)
on the system side actuates, via the stroke (a), the vacuum circuit-breaker's
mechanical interlock and reliably blocks closing of the vacuum circuit-breaker.
Fig. 38 Mechanical interlock
The installation dimensions (c + d) for the interrogation and actuation component (b)
are in the dimension drawing.
X CLOSED position a Stroke (min. 10 mm, max. 30 mm)
Y OPEN position b Interrogation or actuation component (max. actuation force 70 N)
Z View from below c + d see dimension drawing
Description
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Priority opening
To lock vacuum circuit-breakers, switchgear trucks, withdrawable sections or
disconnectors in OPEN position, the drive mechanisms of the vacuum circuit-
breaker can be equipped with "priority opening".
Fig. 39 Priority opening
The assembly "priority opening" has three positions. These positions are actuated
by an interrogation or actuation component in the system.
Trip-free position Actuating "priority opening" with the system's actuation in the first position (trip-free
position, b) triggers opening and prevents closing as long as priority opening is
actuated.
Spring-dump position In the second position (spring-dump position, c) the vacuum circuit-breaker remains
in open state and is reliably secured against reclosing.
In addition, when actuating the interlocking device in the second position, the closing
spring is relaxed by a no-load switching operation.
The closing and the opening spring are now relaxed and hence all energy storages
of the vacuum circuit-breaker discharged.
The operating position (CLOSED/OPEN) of the vacuum circuit-breaker is not
interrogated with "priority opening".
a) b) c)
a) Idle position
b) Trip-free position
c) Spring-dump position
*) Interrogation or actuation component (max. actuation force 70 N)
Note
Compared to the mechanical interlock (see Fig. 29), actuation of the system's
interrogation and actuation component is not prevented if the vacuum circuit-
breaker is closed.
Description
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Rating plate
Technical data
Fig. 41 Technical Data
Dimensions and weights
The dimensions of the vacuum circuit-breaker can be taken from the relevant
dimension drawing. If required, these are available from your Siemens
representative.
The weight is given on the rating plate of the vacuum circuit-breaker (see Fig. 40) or
can be taken from the relevant dimension drawing.
Fig. 40 Example – 3AH47 vacuum circuit-breaker rating plate
a Manufacturer
b Type designation
c Works serial number
d Rated voltage Ur
e Rated frequency fr
Rated short-circuit breaking
current Isc
g Rated power frequency withstand
voltage Ud
h Rated lightning impulse withstand
voltage Up
i Quality control seal
k Year of manufacture
m Rated operating current Ir
n Rated short-circuit duration tk
o Mass m
p Rated operating sequence
r Classification to standard
Rated voltage UrkV 17.5* 27.5* 27.5**
Rated operating current IrA 2000 2500 1250, 2000, 2500 1250, 2000, 2500
Rated lightning impulse withstand
voltage (peak value) UpkV 125 170 185 250 200 185 200
Rated power frequency withstand
voltage (effective value) UdkV 50 70 85 105 95 85 95
Rated short-circuit breaking currentIsc kA 25 /
31.5 40 / 50 40 25 /
31.5 25 25 /
31.5 25 / 31.5
Rated frequency Hz 16.7 50/60
Rated operating sequence A, B C A
Mechanical operating cycle in
thousands 60 20 60 20 60
A O - 3 min - CO - 3 min - CO
B O - 5 s - CO
C O - 0.8 s - CO - 30 s - CO
* one-pole
** two-pole
Description
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Ambient conditions
Installation altitudes
Insulating capaci ty The insulating capacity of insulation in air decreases with rising altitude due to the
lower air density. In conformity with IEC 62271-102, the rated lightning impulse
withstand voltage values given in Fig. 41 are valid up to an installation altitude of
1,000 m above sea level.
As from an altitude of 1,000 m, the insulation level must be corrected as shown in
Fig. 43:
3AH47 vacuum circuit-breakers are suitable for use in
the following climate classes in accordance with
IEC 60721, Part 3-3:
Class
• Climatic ambient conditions: 3K41),
3K62),
3Z2,
3Z5
• Biological ambient conditions: 3B1
• Mechanical ambient conditions: 3M2
• Chemically active substances: 3C23)
• Mechanically active substances: 3S24)
1) peak value of the 24-hour mean: +35 °C
2) Without ice formation and wind-driven precipitation
3) Without occurrence of salt fog and simultaneous condensation
4) Restriction: clean insulating parts
5) Average value, measured over 24 hours
6) Average value, measured over 1 month
Fig. 42 Ambient conditions
U U0 Ka
U Rated withstand voltage U under standard reference
atmosphere
U0Required rated withstand voltage for the installation
location
KaAltitude correction factor
Ka = em (H – 1000)/8150
Calculating the altitude correction factor Ka:
H = Installation altitude in meters
m = 1 for AC voltage, lightning impulse withstand
voltage (between phases, phase-to-earth, applied
longitudinally)
Example
For a required rated withstand voltage of 75 kV at an
altitude of 2,500 m, an insulation level of at least 90 kV
under standard reference atmosphere conditions is
required:
90 kV 75 kV e1 (2500 – 1000)/8150
75 kV 1.2
Fig. 43 Altitude correction factor Ka
Description
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Switching times
Fig. 44 Switching times
Closing time = period between starting (command) of the closing movement and
the moment of contact touch in all poles.
Opening time = period between starting (command) of the opening movement and
opening of the last pole.
Arcing time = period from the start of the first arc to extinction of the arcs in all poles.
Break-time = period between starting (command) of the opening movement and
extinction of the arc in the pole extinct last(= opening time + arcing time).
Close/Open time = period in an open/close cycle between the moment of contact
touch in the first pole during closing and the time when contact touch has been
cancelled in all poles during subsequent opening.
Dead-time = period from the end of the current flow in all poles up to the start of
current flow in the first pole.
Closing time (closing time) < 75 ms
Opening time (opening time)
1st shunt release (Y1) < 60 ms
2nd and 3rd release (Y2, Y4, Y6, Y7) < 55 ms
Arcing time < 15 ms
Break time
1st shunt release (Y1) < 75 ms
2nd and 3rd release (Y2, Y4, Y6, Y7) < 70 ms
Dead time 300 ms
Close/Open time
1st shunt release (Y1) < 90 ms
2nd and 3rd release (Y2, Y4, Y6, Y7) < 70 ms
Minimum command duration
Closing solenoid (Y9) 45 ms
1st shunt release (Y1) 40 ms
2nd and 3rd release (Y2, Y4, Y6, Y7) 20 ms
Shortest pulse time for breaker tripping signal
1st shunt release (Y1) > 15 ms
2nd and 3rd release (Y2, Y4, Y6, Y7) > 10 ms
Charging time if actuated electrically (M1) < 15 s
Synchronous operation error between the poles ≤ 2 ms
Description
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Circuit diagrams
The circuit diagrams show all the available components with their wiring options.
Fig. 45 to Fig. 51 show some non-binding examples of vacuum circuit-breakers.
Compilation of the circuit diagrams for the vacuum circuit-breaker is done in relation
to your order.
Mechanical manual closing and electrical closing
Fig. 45 Sample circuit diagram - connection via low-voltage interface, 64-pin,
basic version
Electrical manual closing and electrical closing
Fig. 46 Example - circuit diagram with connection via low-voltage interface 64-
pin.
This legend is also valid for the following circuit diagrams.
-Y1 -Y2 -Y4
-Y4 -Y5
-Y6 -Y7
-Y7
Release "OPEN"
-Y1 -Y2 -Y4
-Y4 -Y5
-Y6 -Y7
-Y7
"OPEN" release
extended auxiliary switch
HA Manual opening S3 Position switch (opens when closing spring is charged)
HE Manual closing S41, S42 Position switches (signal charging status)
K1 Contactor relay (anti-pumping device) S6, S7 Position switches (for breaker tripping signal)
M1 Motor X0 Low-voltage interface
P Energy storage mechanism Y1 1. shunt release
R1 Resistor Y2 2. Shunt release
S1 Auxiliary switch Y4, Y5, Y6 Transformer-operated release
S10, S11 Position switch (mechanical anti-pumping device) Y7 Undervoltage release
S12 Position switch (prevents electrical closing in the event
of mechanical interlocking)
Y9 Closing solenoid
S21, S22 Position switches (switch off the motor after charging) V6 Integrated rectifiers for motor
Description
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1) Integrated varistor
2) Integrated rectifier for AC/DC≥100 V
3) Line H07V-K1x2.5sw (as per EN 50525-2-31) when motors are used with DC 24 V / 48 V and 60 V
4) Only if a mechanical closing lock is ordered at the same time
a) Motor winding for DC
b) Motor winding with rectifier for AC
c) Closing
d) Closing with anti-pumping device
Fig. 47 Sample circuit diagram 64-pole (part 1) of the vacuum circuit-breaker
a) b) c) d)
Description
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1) Integrated varistor
2) Integrated rectifier for AC/DC≥100 V
a) 1st shunt release with 64-pole plug-connector
b) 1st shunt release with 24-pole plug-connector
c) 2nd shunt release with 64-pole plug-connector
d) 2nd shunt release with 24-pole plug-connector
Fig. 48 Sample circuit diagram (part 2) of the vacuum circuit-breaker
a) b) c) d)
Description
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1) Integrated varistor
2) Integrated rectifier for AC/DC≥100 V
3) Attention: connect L+ for direct current (DC)
a) Undervoltage release
b) Low-energy trip-coil
c) 1st transformer-operated release
d) Signal: spring state with 64-pole plug-connector
e) Signal: spring state with 24-pole plug-connector
f) Breaker tripping signal for 64-pole plug-connector
Fig. 49 Sample circuit diagram (part 3) of the vacuum circuit-breaker
a) b) c) d) e) f)
Description
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The unassigned auxiliary switch terminals are wired up with the 64-pole plug bottom.
Fig. 50 Example – auxiliary switch terminals
Fig. 51 Sample switching operation for connection of the undervoltage release Y7
Normal auxiliary switch Extended auxiliary switch
No wiring required if
a) 2nd shunt release Y2 available
b) Undervoltage release Y7 available
a) b)
System wiring Tripping via NO
contact
Tripping via
NC contact
System wiring
Circuit-breaker wiring
Installation
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Installation
Attachment in the switching cubicle
The vacuum circuit-breaker is delivered in OPEN position. Before installing the
vacuum circuit-breaker, remove the transport aids (see “Unpacking (I)” on page 6 or
“Unpacking (II)” on page 10).
Check data Before installing the vacuum circuit-breaker in a switching cubicle, check the data
(see “Commissioning” on page 45) in order to avoid confusion.
DANGER
High-voltage – danger to life
Touching live parts causes an electric shock.
• Do not touch live parts!
• When performing work on the switchgear, deenergize it and earth it.
• The work described in the following sections must only be performed when
the switchgear has been deenergized:
- Take safety measures to prevent reclosing.
- Observe industrial safety regulations.
- Ensure that the vacuum circuit-breaker is installed and commissioned only
by qualified personnel who are familiar with the operating instructions and
observe the warning notices.
WARNING
Risk of damage from wrong transport means
Using wrong transport means may cause the vacuum circuit-breaker to fall and
injure persons.
• Observe weight
• Use means of transport suited to the requirements and load-carrying
capacity.
• The vacuum circuit-breaker must not fall over.
• Sharp edges may cause injury.
Note
For preliminary work, the vacuum circuit-breaker must be
• secured against falling over,
• placed onto a suitable support or
• suspended from a crane to prepare for installation.
Installation
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Mounting position The 3AH47 vacuum circuit-breaker can only be installed horizontally (to the vacuum
interrupter), as an indoor withdrawable section and as an indoor fixed installation.
Mounting the vacuum circuit-breaker
There are a total of 14 fixing holes on the pole plate (15) and on the mechanism box
(60.) for the various types of installation.
Use M12 screws – strength class 8.8 – for fastening. The binding dimension
drawings are authoritative.
The framework must be made to suit the operating conditions and have sufficient
load bearing capacity and stability.
* bores for M12 screws
Fig. 52 Mounting position
Fig. 53 Fastening options Fig. 54 View Y and Z
Installation
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Earthing
Connecting to earth Connect the vacuum circuit-breaker on the earth terminal (70.) to the high-voltage
protective earth as specified (DIN EN 50341).
• Fully unscrew hexagon socket head screw M12 with washer on the earth
terminal (70.).
• Tighten ring terminal of the earth wire with the M12 hexagon socket head screw
on the earth terminal (70.) with 40 Nm.
Connect low-voltage Connect the low-voltage connecting cables in the customer's switch cabinet in such
a way that safe operation as per supplied circuit diagram is guaranteed.
Note
If the 3AH47 vacuum circuit-breaker is installed into a earthed metal frame and is
connected permanently and electrically conductive, no separate earthing needs
to be done.
Place serrated washers under the screw heads when fastening the vacuum
circuit-breaker in this case.
Fig. 55 Earth terminal Fig. 56 Connecting earth wire
Installation
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Removing the transpo rt securing device from the undervoltage release
Undervoltage release (Y7)
available? The vacuum circuit-breaker with an undervoltage release (Y7) 3AX1103 is supplied
with a transport securing device.
• Remove the two top screws (60.2) of the mechanism box.
• Remove the two bottom screws (60.2) of the mechanism box until the cover
(60.1) can be taken off.
• Slightly tilt the cover (60.1) of the mechanism box and lift off.
• Shift the locking screw of the striker from position A to B (see reference note in
mechanism box [60.] of the vacuum circuit-breaker).
• Replace the cover (60.1) in the reverse order
• and fasten the screws with a tightening torque of 10 Nm.
Fig. 57 Removing the cover Fig. 58 Removing the transport securing device
A
B
Installation
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Electrical connection of the prime conductor
The busbars can be purchased from the Siemens Service Center.
Busbar connection
Adjust the busbars in such a way that, before fastening, they lie flat easily and fit the
holes on the contact areas of the vacuum circuit-breaker.
Preparing contact areas Use a steel brush to brush contact areas (cross-wise) until they are metallically
bright and wipe them off with a clean cloth.
After cleaning, very lightly grease the bright contact areas with acid-free Vaseline
(e. g. Shell-Vaseline 8420) and screw together immediately.
DANGER
High-voltage – danger to life
Test the vacuum circuit-breaker in the switchbay with high-voltage applied only
after faultless functioning has been ascertained (see “Commissioning” on page
45).
Note
Grease the busbars with contact grease prior to mounting.
Fig. 59 Cleaning the contact areas Fig. 60 Cleaning the contact areas of the busbars
Note
Clean silver spray-plated and copper spray-plated contact areas with a cloth, do
not brush.
Different connection materials (AI/CU) must not be cleaned with the same
cleaning tools.
Silver-plated parts must not be bolted to aluminium bars/rails.
Installation
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Corresponding to the nominal current strength, use M12 screws and nuts - strength
class 8.8 - for connection and appropriate spring elements and washers.
When tightening the screws, hold the nuts against tightening torque of 70 Nm with
a suitable screwdriver or socket wrench.
Screw-in depths in the upper and lower terminals
See dimension drawings.
Fig. 61 Installing busbars flat Fig. 62 Installing busbars flat
Note
For vacuum circuit-breakers with connecting bars it is recommended to use the
stainless steel screws or non-magnetisable screws included in the accessory
pack.
Operation
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Operation
Commissioning
Before commissioning, check the following points to ensure that the 3AH47 vacuum
circuit-breaker based is functioning faultlessly:
DANGER
High-voltage – danger to life
Touching live parts causes an electric shock.
• Do not touch live parts!
• Ensure that the vacuum circuit-breaker is operated only by qualified
personnel who are familiar with the operating instructions and observe the
warning notices.
• Check through all of the items on the checklist and ensure correct functioning
before commissioning.
Checklist Notes
Does the information on the rating plate (see page 31) match the ordering
data?
Ensure correct operating voltage.
If necessary, clean vacuum circuit-breaker (details on this in section
“Maintenance plan” on page 50).
Check that screw connections are tightened securely.
Check terminal strip plug-connection for tight seat.
Check functioning of the auxiliary switches.
If necessary, check and adjust customer's devices.
If there is an undervoltage release (Y7) 3AX1103 : has the locking screw
of the striker been shifted from position A to B (see “Removing the
transport securing device from the undervoltage release” on page 42)?
Test switching without supply voltage
Charge the closing spring (62.) with the hand crank (50.) (see 63), then
actuate the CLOSED pushbutton (53.) and, once closing has been
performed, actuate OPEN pushbutton (54.) .
Test switching with supply voltage
For test switching with motor, switch on the supply voltage. The motor
starts up immediately and charges the closing spring (62.). Check
indicator for charge state of the closing spring (mechanically and
electrically).
Electrically check through auxiliary switch S1 (68.) and position switch
(50.4.1) in both end positions – operate the 3AH47 vacuum circuit-breaker
to do so.
Check functioning of the closing solenoid Y9 (53.1) and all available shunt
releases by operating them electrically.
Operation
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First closing operation
If all functions have been checked and are ok, switch on high-voltage while
observing all of the safety regulations and operative requirements.
Charging the closing spring
If the supply voltage is applied, the closing spring (62.) is automatically charged by
the motor (50.4).
Hand crank If the supply voltage fails, the closing spring (62.) can be charged with a hand crank
(50.).
1. For this, fit the hand crank (50.) onto the hand crank coupling (50.5) through the
opening (50.1) with the adapter pushed forward (50.6).
2. Turn clockwise until the spring state indicator (55.) changes over:
WARNING
Do not commission the vacuum circuit-breaker if there are malfunctions.
If the malfunctions or the damage cannot be remedied, contact a Siemens
representative or Siemens Service and, if necessary, send back the vacuum
circuit-breaker.
WARNING
Risk of injury if hand cranks other than the original hand crank are used.
When the supply voltage is present, the motor immediately recharges the spring
after a closing operation. If the hand crank does not have a slip coupling, the hand
crank will also rotate.
To avoid injuries caused by the motor starting suddenly, the vacuum circuit-
breaker must be charged only using the original hand crank.
Relaxed Charged
Fig. 63 Charging the closing spring with the hand
crank
Fig. 64 Operating elements and spring state indicator
Operation
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The adapter (50.6) of the hand crank (50.) is designed in such a way that the hand
crank becomes uncoupled when the motor supply voltage returns.
Closing
Provided there is no lock-out due to a mechanical interlock, send the closing
command via the CLOSED pushbutton (53.) or the corresponding command
element until the vacuum circuit-breaker is closed and shows and signals the
CLOSED position.
Change of the position indicator (59.):
After switching on and possibly releasing the CLOSED pushbutton (53.), the closing
spring (62.) is immediately automatically charged by the motor and the indicator
"Closing spring charged" (55.) becomes visible.
Change of the spring state indicator (55.):
Opening
The opening spring (64) is charged during the closing operation.
To open, send the opening command via the OPEN pushbutton (54.) or the
corresponding command element until the vacuum circuit-breaker is open and
shows and signals the OPEN position.
Change of the position indicator (59.) after electrical opening:
The spring state indicator (55.) does not change.
Relaxing the closing spring
To relax the closing spring,
• the supply voltage must be deactivated
• the vacuum circuit-breaker must be closed manually (see “Closing” on page 47)
and then
• opened manually (see “Opening” on page 47).
OPEN CLOSED
Charged Relaxed Charged
Note
If an undervoltage release 3AX1103… is fitted, it must be connected to control
voltage for switching operations (mechanical or electrical), as otherwise closing
is not possible.
CLOSED OPEN
Operation
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Blank page
Maintenance
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Maintenance
Maintenance and servicing
To maintain reliability during the entire operating time and to ensure the operating
cycle numbers, depending on
• the type of vacuum circuit-breaker (see “Technical data” on page 31)
• the operating conditions see “Ambient conditions” on page 32),
• the number of mechanical and electrical operating cycles,
• and the operating time,
regular maintenance work must be performed according to the following
maintenance plan.
This is especially the case for the vacuum circuit-breaker
• with instantaneous release 3AX601 for traction power supply with 16.7 Hz for
compliance with the short break-times and
• with two vacuum interrupters arranged one over the other to ensure sufficient
synchronism of the two vacuum interrupters.
DANGER
High-voltage – danger to life
Touching live part s is fatal or causes serious physical injury.
Before beginning maintenance work, note the five safety rules for high-voltage
equipment specified in EN 50110-1, namely:
• Isolate from the power supply*)
• Secure against reclosing
• Verify safe isolation from the power supply
• Earth and short-circuit
• Cover or cordon off neighboring live parts
*) On the vacuum circuit-breaker, actuate the OPEN, CLOSED and OPEN
pushbuttons manually one after the other. This ensures that the vacuum circuit-
breaker is open and the closing spring is relaxed.
Note
The vacuum circuit-breaker should be taken out of the switch cabinet or
switchgear for servicing.
Note
Applies to the 3AH4756 and 3AH4757 vacuum circuit-breakers with grading
capacitors:
If the vacuum circuit-breaker is taken from the switchgear, any residual charge of
the capacitors, e.g. due to brief closing of the vacuum circuit-breaker, should be
diverted. However, due to the low capacity, direct contact is not dangerous.
Maintenance
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Maintenance plan
Fig. 65 Maintenance plan
Notes on the maintenance list:
1) If the vacuum circuit-breaker is operated under unfavorable conditions indoors
(heavy and frequent condensation, dusty air, etc.), we recommend cleaning the
insulating parts and possibly the outer parts of the circuit-breaker at shorter
intervals.
The insulating parts must be clean if their insulating capacity is to be
guaranteed. Rub insulating parts with a moist cloth.
As a cleaning agent, use only warm water with a mild, liquid household
detergent added and leave to dry.
2) Joints and bearings that cannot be disassembled have to be washed out with
detergent prior to work.
3) Lubricant:
No. Work to be done Operating and
auxiliary materials
Frequency Remarks
annually
every 5 years
every 10 000*)
every 30 000*)
*) mechanical operating
cycles
1. Vacuum circuit-breaker
1.1 Clean insulating parts and outer
parts
Warm water,
household cleaners
x Note 1)
1.2 Check tripping system for
unencumbered movement and
grease as needed
Isoflex Topas L 32
Shell Tellus oil 32
x with instantaneous release
Note 2), 3)
1.3 Grease all bearing parts and sliding
surfaces;
Perform 3 to 5 mechanical test
switching operations after greasing
Isoflex Topas L 32
Shell Tellus oil 32
x See Fig. 67 and Fig. 66
Note 2), 3), 6)
1.4 Check all electrical operating
materials in the drive for correct
functioning
x Note 4), 5), 6)
1.5 Check line connections for tight seat x
1.6 Check contact stroke and re-adjust if
necessary
x with instantaneous release
Note 7)
x with two vacuum interrupters,
note 7), 8)
1.7 Exchange vacuum interrupters
x only 3AH4 756 and 757
Note 9)
x Note 9)
1.8 Exchange motor M1 x Note 4)
1.9 Exchange closing spring x Note 4)
Bearings, sliding surfaces: Isoflex Topas L 32
Bearings and bearings of the auxiliary switch S1
that are inaccessible in terms of greasing:
Shell Tellus oil 32
Maintenance
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Lubricants are available from the responsible Siemens representative:
4) On all the exchanged parts, the locking elements used must be exchanged as
well (spring rings, SL retainers, cotter-pins etc.).
The Siemens sales representative offers an assortment of locking elements.
Order no. 3AY1550-1A
5) Position switches must only be fastened so tight that the tappet is easily moved.
6) Grease all bearing parts and sliding surfaces on the pole side (see Fig. 66).
Fig. 66 Bearings and sliding surfaces of the pole side
Grease all bearing parts and sliding surfaces of the operating mechanism (see
Fig. 67).
Order no.
180 g Isoflex Topas L 32 3AX11 33-3H
1 kg Shell Tellus Öl 32 (special oil) 3AX11 33-2D
1 kg Isoflex Topas L 32 3AX11 33-3E
Isoflex Topas L 32
t Bolts of the angle lever
u Bolts and eyebolt of the insulating operating rod
v Contact pressure spring, spring plate and spring bearing
w Spring guide and bolts of the angle lever
Maintenance
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Fig. 67 Bearings and sliding surfaces of the operating mechanism
Isoflex Topas L 32 Shell Tellus oil 32
a Crankpin for sensing device actuation b Bearing for deflection lever
c Curve contour f Auxiliary switch
d Close-latch j Circuit-breaker shaft bearing
e Deflection of auxiliary switch p Opening spring bearing
g Opening spring guide r Spring eyelet on closing spring
h Deflection of auxiliary switch
k OPEN-latch
l Curve for OPEN-latch
m End stop
s Contact area of instantaneous release
Maintenance
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7) Adjusting the contact stroke:
Due to erosion and mechanical deformation (compression) of the contacts, the
contact stroke increases and the contact force is reduced. In order to maintain
break-times within the specified tolerances, the increase in the stroke may not
be more than 2 mm. By unscrewing the eye bolt in the insulating operating rod
(48.), it is extended and the contact stroke is reduced corresponding to the ratio
of the pole gearing (approx. 1:2). The determination of the contact stroke is
done as a difference measurement at the movable contact pins of the vacuum
interrupters in the CLOSED and OPEN switching positions.
Nominal dimension of the contact stroke of the vacuum interrupters for the
various types of vacuum circuit-breakers:
Fig. 68 Nominal dimension
8) Adjusting the contact stroke and the synchronism:
With vacuum circuit-breakers with two vacuum interrupters arranged one over
the other, the synchronism of the two vacuum interrupters must be checked and
adjusted if necessary, before the contact stroke for each of the vacuum
interrupters is adjusted.
To check the synchronism the lengths of the charged contact pressure springs
are compared on the closed vacuum circuit-breaker. If the difference is more
than 2 mm, the synchronism must be adjusted as follows:
- Open the vacuum circuit-breaker and separate the operating rods from the
circuit-breaker shaft in the operating mechanism. The contacts of the
vacuum interrupters move here under the effect of the air pressure until
contacting the first vacuum interrupter. The second vacuum interrupter is
blocked as a result.
- Release the four bearing block screws on the pole gearing. The bearing
block assumes a new central position and is screwed back in at this new
position.
- Coupling of the operating rod with the circuit-breaker shaft in the operating
mechanism and another check of the synchronism.
Afterward, the contact stroke of both vacuum interrupters can be checked and
adjusted to the nominal dimension as per "Note 7".
9) Replacement of the vacuum interrupters may possibly be necessary earlier,
depending on the number of electrical openings.
Circuit-breaker type Tube type Nominal dimension in mm
3AH4 754/55 VS 30040/41 16 +0/-1
3AH4 756/57/66 VS 10047/48 11 +0/-1
3AH4 784 VS 30029/30 20 +0/-1
3AH4 785 VS 30040/41 20 +0/-1
3AH4 794 VS 36025 L 14.5 +0/-1
Maintenance
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Vacuum interrupter service life
If switching operations occur frequently under overload or short circuit, the service
life of the vacuum interrupters may be reached prematurely.
After reaching the maximum permissible number of operating cycles of:
mechanical or electrical load changes (to the rated current), the vacuum interrupters
must be replaced. Detailed replacement instructions are supplied with the
replacement tubes.
When ordering vacuum interrupters, please always state the circuit-breaker type
and serial number (see “Rating plate”, on page 31).
Accessories and spare parts
Replacing spare parts To ensure that the device operates reliably, spare parts must be replaced only by
trained and certified personnel.
Fig. 69 Accessories to be ordered
Always specify the vacuum circuit-breaker's type and serial no. (see “Rating plate”,
on page 31) when ordering spare parts.
VS 10047/48 = 60 000
VS 30029/30, VS 30040/41, VS 36025 L = 30 000
CAUTION
Risk of injury!
The vacuum circuit-breaker should be taken out of the switch cabinet or
switchgear for servicing.
Separate vacuum circuit-breakers from the control feed voltage or switch it off
and release low-voltage plug or clip connection.
Accessories/spare part Order no. Comments
Operating instructions 9229 9947 100
Hand crank 3AX1530-2B
Locking elements 3AY1550-1A
Lubricant see “Maintenance plan” on
page 50)
Vaseline (contact grease)
e. g. Atlantic white, Atlantic Mineralölwerk GmbH
Pasty consistency, flame point
210 °C, low acid
Maintenance
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Manufacturer's product liability
The manufacturer's product liability shall be excluded if at least one of the following
criteria applies:
• Original Siemens spare parts are not used.
• Fitters carrying out replacements have not been trained and certified by
Siemens.
• Parts have been incorrectly fitted or adjusted.
• Adjustments are not made in accordance with Siemens specifications.
• After installation and adjustment, no final test is performed with a tester
approved by Siemens including documentation of the test results.
To keep documentation complete, it is important that measurement results are
submitted to the responsible Siemens representative.
Disposal
The materials of the vacuum circuit-breaker should be recycled. Disposal of the
vacuum circuit-breakers with minimum environmental impact is possible on the
basis of existing legal regulations.
Metal The switch's metal components can be recycled as mixed scrap, although wide-
ranging dismantling into sorted scrap and mixed scrap residues is more
environmentally sustainable.
Electronics Electronic scrap must be disposed of in accordance with applicable regulations.
Materials The vacuum circuit-breaker consists of the following materials:
• Steel (partly phosphatized, galvanized and yellow chromated)
• Copper (partly silver-plated)
• Plastics (epoxy resin, polyamide, polyester, polycarbonate, ABS-PC mixture;
partly fiberglass-reinforced)
• Rubber materials
•Ceramics
•Lubricant
Packaging If the packaging is no longer needed, it can be fully recycled.
Hazardous substances When delivered by Siemens, the product does not contain any hazardous
substances within the scope of the hazardous substances regulations applicable to
the territory of the Federal Republic of Germany. For operation outside the Federal
Republic of Germany, the applicable local laws and regulations must be complied
with.
Further information Contact your Siemens Service Center if you require further information.
Service
For details of contacts for service work, consult Siemens IC LMV SE Services at
• Telephone: +49 180/5247000
• Fax: +49 180/5242471 or
• on the Internet at the Web address: www.siemens.com/energy-support
• by e-mail: support.energy@siemens.com
• or any local Siemens office.
Maintenance
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Index of keywords
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Index of keywords
A
Accessories to be ordered .................................... 54
Altitude correction factor ....................................... 32
Ambient conditions ................................................ 32
Angle lever ............................................................ 16
Auxiliary switch ..................................................... 18
B
Basic equipment ................................................... 19
Bearings and sliding surfaces ............................... 52
C
Centering .............................................................. 16
Circuit-breaker shaft .............................................. 18
Circuit-breaker tripping signal ............................... 23
Climate classes ..................................................... 32
Closing damper ..................................................... 18
Closing solenoid ............................................ 18, 21
Closing spring ............................................... 18, 28
Conductor bars ..................................................... 44
Contact position indicator CLOSED-OPEN .......... 18
Contact pressure spring ........................................ 15
Contact stroke ....................................................... 17
Contact system ..................................................... 17
Contactor relay ...................................................... 18
Cover .................................................................... 17
Cut-out switch ....................................................... 23
D
Dashpot ................................................................. 18
Disconnected position ........................................... 29
E
Earth terminal ................................................ 18, 41
Electric manual closing ......................................... 28
G
Gear unit ............................................................... 18
H
Hand crank ............................................................ 46
Hand crank coupling ............................................. 18
Heater (condensation water protection) 18– 19, 28
High-voltage protective earth ................................ 41
I
Installation altitudes .............................................. 32
Instantaneous release H83 Opt. ................... 18, 27
Insulating capacity ................................................ 32
Insulating operating rods ....................................... 15
Interlocking devices .............................................. 29
Interrupter support ................................................ 16
L
Low-voltage interface .................................... 18– 19
M
Mechanical anti-pumping device ........................... 19
Mechanical interlock ..................................... 19, 29
Mechanical manual closing ........................... 19, 28
Mechanical manual opening .................................. 19
Mechanism box ............................................ 15, 18
Mechanism box, opened ....................................... 18
Motor ............................................................ 18, 20
Mounting position .................................................. 40
O
Opening spring ...................................................... 18
Operating cycle counter ................................ 18– 19
Operating position ................................................. 29
Operating rod ......................................................... 18
P
Pole assembly .............................................. 15– 16
Pole plate ............................................................... 15
Position switch .............................................. 18, 23
Post insulator ......................................................... 15
R
Range of application .............................................. 13
Rated frequency .................................................... 31
Rated lightning impulse withstand voltage ............ 31
Rated operating current ......................................... 31
Rated operating sequence .................................... 31
Rated power frequency withstand voltage ............. 31
Rated short-circuit breaking current ...................... 31
Rated short-circuit duration ................................... 31
Rated voltage ........................................................ 31
Rating plate .................................................. 18, 31
S
Shunt release ....................................... 18, 21, 25
Spring state indicator .................................... 17– 18
Standards .............................................................. 14
Strut ....................................................................... 15
Switching times ...................................................... 33
T
Terminal strip ......................................................... 24
Transformer-operated release .............. 18– 19, 25
Transformer-operated release (0.1 Ws) Y6 ........... 18
U
Undervoltage release ........................... 18– 19, 26
V
Vacuum interrupter ....................................... 15– 16
Vacuum interrupter, contact system ...................... 17
Vacuum interrupter, service life ............................. 54
Index of keywords
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Legend for all pages
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Legend for all pages
15. Pole plate
16.1 Upper post insulator
16.2 Lower post insulator
19. Pole assembly, complete
20. Upper interrupter support
27. Upper terminal
28. Strut
28.1 Centering
29. Lower terminal
29.1 Flexible connector
29.2 Clamp
30. Vacuum interrupter
38. Grading capacitor
39. Pole gearing
39.1 Bearing block
40. Lower interrupter support
48. Insulating operating rod
48.6 Angle lever
49. Contact pressure spring
50. Hand crank
50.1 Opening for hand crank
50.2 Gear unit
50.4 Motor M1
50.4.1 Position switch
50.5 Hand crank coupling
50.6 Hand crank adapter
51. Rating plate
51.1 Opening for rating plate
53. CLOSED pushbutton
53.1 Closing solenoid Y9
54. OPEN pushbutton
54.1 Shunt release Y1
54.2 Shunt release or instantaneous release Y2
54.3 Transformer-operated release Y4
54.4 Undervoltage release Y7
54.5 Transformer-operated release (0.1 Ws) Y6
55. Spring state indicator
55.1 Opening for spring state indicator
58. Operating cycle counter
58.1 Opening for operating cycle counter
59. Contact position indicator CLOSED-OPEN
59.1 Opening for position indicator CLOSED-
OPEN
60. Mechanism box
60.1 Cover
60.2 Transport borehole
60.3 Crane hook symbol
61. Dashpot
62. Closing spring
63. Circuit-breaker shaft
64. Opening spring
66. Closing damper
68. Auxiliary switch S1 (6NO+6NC)
68.0.1 Extended auxiliary switch S1 (12NO +
12NC)
68.1 Operating rod (for auxiliary switch S1)
68.7. Low-voltage interface X0
68.7.1 Plug
68.7.2 Terminal strip
69. Contactor relay K1
70. Earth terminal
71. Heater (condensation water protection)
72. Spring charge release
72.1 Lever of the spring charge release
90. Mechanical interlock
Published by
Siemens AG
Infrastructure & Cities Sector
Low and Medium Voltage Division
Medium Voltage & Systems
Schaltwerk Berlin
Nonnendammallee 104
13629 Berlin
