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© Siemens AG 1996. All rights reserved.
3AH3
Vacuum circuit-breaker
3AH30 ... 3AH33
OPERATING INSTRUCTIONS
Order no.: 9229 9860 176 0E
Ordering location: IC LMV LP PO P C41
AG 08.2013 en
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For your safety
Signal terms and defini-
tions
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 notices 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 authorization to energise, de-energise, clear, earth 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 have 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
Unpacking (III) .................................................................................................................................................... 12
Reusing the transport unit .................................................................................................................................. 15
Storage ...............................................................................................................................................................15
General information ....................................................................................................................................... 17
Range of application ...........................................................................................................................................17
Standards ..................................... ................. ................ ................ ................ ..................................................... 18
Design approval as per X-Ray Ordinance ..........................................................................................................18
Scope of delivery ................................................................................................................................................18
Description ........................................................................................................................................................ 19
Design ....................................... ................................................. .........................................................................19
Locking devices ................................................................................................................................................. 32
Rating plate ...................................... .......................................... ... ... .................................................................. 35
Technical data .....................................................................................................................................................35
Ambient conditions ............................................................................................................................................. 36
Installation altitudes ............................................................................................................................................36
Switching times .................................................................................................................................................. 37
Circuit diagrams ................................................................................................................................................. 38
Mounting ....................................... .......................... ............................. ............................. .................................. 43
Attachment in the switching cubicle .............................................................. ... ... .... ... .........................................43
Earthing ..................................... .................... ................... ................... .................... ........................................... 45
Electrical connection of the prime conductor ................................................................... .... ... ........................... 47
Operation .......................................... ................................ ............................. ..................................................... 49
Commissioning ...................................................................................................................................................49
First closing operation .........................................................................................................................................50
Closing ................................................................................ ................................................................................51
Opening ..............................................................................................................................................................51
Maintenance .................................... ................................................................... ............................................... 53
Maintenance and servicing .................................................................................................................................53
Interrupter service life ..... .... ... ... ... .... .......................................... ... ... .................................................................. 56
Accessories and spare parts ...............................................................................................................................56
Manufacturer's product liability ........................................................................................................................... 57
Disposal ..............................................................................................................................................................57
Service ................................... ............................................................................. ................................................57
Index of keywords .......................................................................................................................................... 59
Legend for all pages ...................................................................................................................................... 61
Note
Sections with Addendum (I), (II) or (III)
Sections with Addendum (I) refer to vacuum circuit-breakers with a rated operating current of < 3150 A. Sections
with Addendum (II) refer to vacuum circuit-breakers packed with brackets with vertical connecting bars and a rated
operating current of ≤ 4000 A. Sections with Addendum (III) refer to vacuum circuit-breakers with a rated operating
current of 3150 A.
If no addendum is given, the information is applicable for all 3AH3 vacuum circuit-breakers.
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Blank page
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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 to the installation
site or storage location.
Transporting with crane or fork lift
WARNING
Heavy transport weight
Transport unit may fall and fail and sling gear may break.
Use lifting gear, transporting and sling gear suited to the requirements and load-
carrying capacity. Observe transport symbols.
Note
Observe stacking height
For transport, no more than three constructionally identical transport units must
be piled on top of each other.
Observe the loads specified on the transport unit.
Note
Secure load
For transport, secure the 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 wooden case (III)
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Transport, storage and packing
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Transporting 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.
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.
CAUTION
Risk 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 the carton, since it is designed t o be reused and
because of the belt straps 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 pos-
sible to transport the vacuum circuit-breaker on the pallet without using belt strap s
(see Fig. 5).
Fig. 3 Removing the carton
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• Remove partitions and accessory pack and store safely in the packaging for
later attachment.
• Remove film from the vacuum circuit-breaker.
• In the case of overseas packaging, push the lower film onto the pallet floor.
• Check the delivery is complete.
• Check vacuum circuit-breaker for damage.
• If the vacuum circuit-breaker is damaged, ship it back in the original transport
unit (see “Reusing the transport unit”, page 15).
Transporting with pallet,
without carton
The vacuum circuit-breaker can be transported with the pallet, without the carton.
• Thread carrying straps 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,
flaking, 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 15).
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 partitions and film Fig. 5 Transporting with pallet possible
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Transporting without pallet • Remove all tensioning belts and bits of fastening wood.
• Remove accessory pack, if applicable.
• Screw suitable eyebolts into the outer pole heads parallel to each other.
• 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 eyebolts 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 dashp ots are not damaged when setting down.
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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 leave 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
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Transport, storage and packing
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Unpacking (II)
Variant with brackets
Remove carton as described in Fig. 1 and Fig. 3.
Working equipment Required tools:
- Knife/scissors
- Screwdriver
- Open-end wrench
- Lifting equipment with lifting gear.
Transporting with brackets • Remove partitions and accessory pack and store safely in the packaging for
later attachment.
• Attach suitable bolt in the middle pole head.
• Attach sling gear to bolt and to transport boreholes.
Fig. 10 Removing partitions and film Fig. 11 Lifting the vacuum circuit-breaker
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Transport, storage and packing
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Transporting without
brackets
• Only lift the vacuum circuit-breaker far enough to put all sling gear under tension.
• Remove angle plate and bracket screws from the pallet.
• Lift the vacuum circuit-breaker from the pallet.
• Remove all screw connections from the brackets on the pole plate and the terminals.
• Remove angle plate below mechanism box.
• Transport to installation site or leave suspended from crane for further work
steps.
Fig. 12 Removing screws from the pallet Fig. 13 Removing the angle plate and brackets
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Unpacking (III)
Working equipment Required tools:
- Screwdriver
- 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.
• Unscrew all the screws from the cover and lift it off.
• Remove partitions and store safely in the packaging for later attachment.
Note
Do not use the vacuum circuit-breaker if parts are broken, i.e. if you find cracks,
flaking, 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 15).
Fig. 14 Removing the cover Fig. 15 Taking out the partitions
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• Unscrew all the screws from the side walls.
• Take the supports out of the transport unit.
• Remove the side walls.
• Remove accessory pack and store safely in the packaging for late r attachment.
• Remove film from the vacuum circuit-breaker.
• Check the vacuum circuit-breaker for damage.
• Undo tensioning belts, if applicable.
Fig. 16 Removing the supports Fig. 17 Removing the side walls
Fig. 18 Taking out the accessory pack Fig. 19 Removing the film
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Transport, storage and packing
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Transporting to the instal-
lation site
• Hook crane hooks into the transport screws and into the openings on the mechanism box.
• Observe crane hook symbols.
• Vertically lift out vacuum circuit-breaker.
• Transport to installation site or leave suspended from crane for further work
steps.
CAUTION
Crushing hazard
Hands may get crushed when lifting out the vacuum circuit-breaker.
Do not reach between the transport box and the vacuum circuit-breaker.
Fig. 20 Preparing for lifting out Fig. 21 Lifting out
Note
Keep partitions and accessory pack ready for the installation.
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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 wooden
case with the most components can be reused.
Do not reuse severed tensioning belts 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 film and seal with adhesive tape.
• Attach accessories pack.
• Attach carton securely to the pallet floor.
• Screw the wooden case back together.
• Before returning to the factory, ask the responsible sales representative for a
returned goods number (see also “Service”, on page 57).
• When returning a vacuum circuit-breaker, always indicate the type and serial
number (see “Rating plate”, on page 35).
Storage
Note
Store the vacuum circuit-breaker in the following condition:
• OPEN switching position
• Closing spring discharged
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 ca nnot 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.
1 year
-5 °C to +40 °C — max. 4
open over 1 year -5 °C to +40 °C
if necessary,
with new corrosion protection
—
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Transport, storage and packing
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General information
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General information
Smooth and safe operation of this device requires proper transport and storage, a nd
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
3AH3 vacuum circuit-breakers are 3-pole interior circuit-breakers for a rated voltage
range of 7.2 kV - 36 kV.
Under normal operating conditions, the vacuum circuit-breaker (as per IEC 62271-1
and VDE 0671-1) is maintenance-free up to 10 000 operating cycles.
Intended use 3AH3 vacuum circuit-breakers are suitable for switching any type of alternating cur-
rent 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.
3AH3 vacuum circuit-breakers operate in continuous, periodic and short-term oper-
ation.
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. These personnel must be familiar with all the warnings and servicing
measures specified in these operating instructions.
Note
In the event of subsequent attachments or integrations, e. g. locking parts in connection with switchgears, ensure that
• fast-moving parts are not additionally loaded with mass or force, and
• additional parts have sufficient clearance, 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 23).
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General information
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Standards
The 3AH3 vacuum circuit-breakers comply with the regulations:
• IEC 62271-1 and
• IEC 62271-100
All 3AH3 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 th e 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:
• Vacuum circuit-breaker 3AH3
• Hand crank for circuit-breaker 3AX 1530-2B (optional)
• If applicable, partitions with mounting drawing
• Operating instructions and unpacking instructions
• Circuit-breaker-specific circuit diagrams
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Description
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Description
Design
Vacuum circuit-breaker The 3AH3 vacuum circuit-breaker consists of
• the mechanism box (60.),
• the 3 pole assemblies (19.) with vacuum interrupters (30.),
• the cast resin post insulators (16.1 and 16.2) with reinforcing struts (28.) and
• the insulating operating rods (48.) with contact pressure springs (49.) required
for contact actuation.
Each of the 3 pole assemblies (19.) is carried by the cast resin post insulators (16.1
and 16.2) that are screwed to the pole plate (15.).
Fig. 22 Side view
15. Pole plate
16.1 Upper post insulator
16.2 Lower post insulator
19. Pole assembly, complete
28. Strut
30. Interrupter
48. Insulating operating rods
49. Contact pressure spring
60. Mechanism box
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Description
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Pole assembly The pole assembly (19.) of the 3AH3 vacuum circuit-breaker consists of
• the upper interrupter support (20.)
• with the upper terminal (27.)
• 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.
Contact system in the interrupters
A slight change in the contact stroke that occurs over the entire useful life of the
interrupter has no effect on the function of the vacuum circuit-breaker. There is no
need for a status indicator for the contact system.
Fig. 23 Pole assembly (I) Fig. 24 Pole assembly (II and III)
19. Pole a ssembly 29.1 Flexible connector
20. Upper inter rupter support 29.2 Clamp
27. Upper terminal 30. Interrupter
28. Strut 40. Lower interrupter support
28.1 Centering 48.6 Angle lever
29. Lower terminal
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Description
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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 CLOSE 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).
Indicators The charged state of the springs is indicated via the spring state indicator (55.). The
position indicator (59.) shows th e 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. 25 Operating and indicator elements
50.1 Opening for hand crank 58. Operating cycle counter
51. Rating plate 59. Position indicator CLOSED-OPEN
53. CLOSE pushbutton 60.1 Cover
54. OPEN pushbutton a) Tightening torque Md = 10 Nm
55. Spring state indicator
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Description
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Fig. 26 Opened mechanism box
50.2 Gear unit
50.4 Motor M1
50.4.1 Position switch
50.5 Hand crank coupling
51. Rating plate
53.1 Closing solenoid Y9
54.1 Shunt release Y1
54.2 Shunt 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
58. Operating cycle counter
59. Position indicator CLOSED-OPEN
60. Mechanism box
61. Dashpot
62. Closing spring
63. Circuit-breaker shaft
64. Opening spring
66. Closing damper
68. Auxiliary switch S1
68.1 Operating rod (for auxiliary switch S1)
68.7 Low-voltage interface X0
69. Contactor relay K1
70. Earth terminal
71. Heater R01 (condensation water protection)
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Description
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Equipment
Basic equipment The basic equipment of the 3AH3 vacuum circuit-breaker contains:
Additional equipment Every 3AH3 vacuum circuit-breaker can also be fitted with the follo wi ng e qui pme nt:
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 sales representative.
Motor (M1)
Contactor relay (electrical anti-pumpin g de vic e) (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-pole
• Plug-connector with sleeve housing 24-pole
• Terminal strip (X1)
Operating cycle counter
Mechanical anti-pumping device
Mechanical manual closing and opening
Shunt release
1)
3AX1101
1) Subsequent installation possible
(Y2, Y3)
Transformer-operated release 3AX1102
1)
(Y4, Y5)
Transformer-operated release 3AX1104 (0.1 AC)
1)
(Y6)
Undervoltage release 3AX1103
1)
(Y7)
Heater (condensation water protection)
1)
(R01)
Electrical manual closing
2)
Mechanical locking device
1)
Spring charge release
2)
2) No subsequent installation possible
Priority opening
2)
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Description
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Motor M1
*) The operator's supply voltage may deviate from the rated su pply voltag e of the
vacuum circuit-breaker by -15 % to +10 %.
**) Built-in automatic circuit-breaker with C characteristic.
Fig. 28 Recommendation for motor protection device
Contactor relay K1
After the supply voltage is applied and if the closing
spring is discharged, 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 1400 W.
In the short charging time, the motor temporarily oper-
ates in the overload range. See Fig. 28 for the rated current 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. 27 Motor (50.4)
Rated supply voltage U*)
VDC24DC48DC60DC110
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. 29 Contactor relay (69.)
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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 con tinuous
operation and is automatically deactivated within the circuit-breaker.
The operator's supply voltage may deviate from the
rated supply voltage of the vacuum cir cuit-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. 30 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 cir cuit-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. 31 1st shunt release (54.1)
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Description
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Auxiliary switch S1
Breaking capacity
Fig. 33 Breaking capacity of the auxiliary switch 3SV92
Two 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. 32 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
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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. 34 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 open ing, the cut-
out switch S7 interrupts the contacting.
Fig. 35 Circuit-breaker tripping signal
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Description
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Low-voltage interface X0, 64-pole
For connection of the control line, the standard version of the vacuum circuit-br eakers is equipped with a 64-pole low-voltage interface X0 (68.7).
The 64-pole plug (68.7.1) for the e xterna l termin al, is suitab le for crimp termina tion
of control lines with a nominal cross-section of 1.5 mm
2
.
Terminal strip (optional) Instead of the 64-pole plug (68.7.1), a terminal str ip (68.7.2) can be ordered as inter-
face to the terminal at the customer's site.. Assignment of the ter minals is done
according to the circuit diagram supplied.
Fig. 36 Low-voltage interface X0 Fig. 37 Terminal strip (optional )
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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-operated 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 “open” command is passed
by means of a magnet armature to the “OPEN” latch by
release of an energy storage mechanism, thus opening
the vacuum circuit-breaker. This opening 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. 38 2. Shunt release (54.2)
The transformer-operated releases Y4, Y5 or Y6 co nsist
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 energy storage mechanism is
unlatched, thus initiating opening of the vacuum circuitbreaker.
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. 39 Transformer-operated releases (54.3)
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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. If this latter method is used, the solenoid coil's
short-circuit current is limited by the built-in resist or .
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. 40 Undervoltage release (54.4) Fig. 41 Typical circuit for connection of the undervolt-
age release Y7
A
B
R1 resistor
S1 auxiliary switch
Y7 undervoltage release
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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 th e clos ing spring. Instead of this mechanical manual closing, “electrical manual closing” is also available.
In this version, the closing circuit of the vacuum circuit-breaker module 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 module, for example, via the auxiliary contact of a disconnector.
Vacuum circuit-breakers with electrical manual closing cannot be switched
mechanically.
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 heater's surface temperature is at the most 180 °C.
Power consumption 50 W
Fig. 42 Heater (71.)
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Locking 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 a locking
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 only be switched on in operating or disconnected
position. The operating or disconnected position is the position of the vacuum circuitbreaker on the switchgear truck or withdr awable 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 the vacuum circuit-breaker in the switchgear
Disconnected position The isolating distance between the vacuum circuit-breaker contacts and the switch-
gear 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 locking device (optional with spring drive mechanism)
A sensing and actuation component (b) on the system side detects the operating
position (CLOSED/OPEN) of the vacuum circuit-breaker.
CLOSED switching posi-
tion
If the vacuum circuit-breaker is closed, actuation of the system's sensing 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 switching position If the vacuum circuit-breaker is open, the sensing and actuation component (b) on
the system side actuates, via the stroke (a), the vacuum circuit-breaker's mechanical locking device and reliably blocks closing of the vacuum circuit-br ea ke r.
Fig. 43 Mechanical locking device
The installation dimensions (c + d) for the sensing and actuation component (b) a re
in the dimension drawing.
X CLOSED switching position a Stroke (min. 10 mm, max. 30 mm)
Y OPEN switching position b Interrogation or actuation component (min. actuation force 70 N)
Z View from below c + d see dimension drawing
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Spring charge release
The springcharge release (72.) is an assembly that prevents removing the plug
(68.7.1) from the vacuum circuit-breaker when it is closed.
Fig. 44 Spring chargerelease
The lever (72.1) of the spring charge r elea se o n the m echa nism box lo cks the leve r
of the plug in idle position (a).
When the lever of the springcharge releas e is brought into operating position (b),
opening is reliably done via the mechanics of the vacuum circuit-breakers and the
closing latch is cancelled.
A no-load switching operation is done in the course of this.
Only now is it possible to undo the plug of the low-voltage interface.
a)
b)
a) Idle position – CLOSED switching position
b) Operating position – OPEN switching position
68.7 Low-voltage interface
68.7.1 Plug
72. Spring chargerelease
72.1 Lever of the springcharge release
Note
The spring charge release can also be combined with a mechanical locking
device.
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Priority opening
To lock the OPEN position, the drive mechanisms of the vacuum circuit-breaker can
be equipped with “priority opening”. This is al so the case for vacuum circuit-bre akers
on switch gear trucks, in withdrawable sections or with disconnectors.
Fig. 45 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 When actuating “priority opening” by putting into first position on the system (trip-free
position, b), opening is triggered, closing is prevented and reclosing is reliably prevented as well.
Spring-dump position In the second position (spring-dump position, c) the vacuum circuit-breaker re mains
in open condition.
In addition, when actuating the locking device in the second position, the closing
spring is discharged by a no-load switching operation.
The closing and the opening springs are n ow discharged and hence all of the energy
storages of the vacuum circuit-breaker are also discharged.
The operating position (CLOSED/OPEN) of the vacuum circuit-breaker is not inter-
rogated with “priority opening”.
a) b) c)
a) Idle position
b) Trip-free position
c) Spring-dump position
*
) Interrogation or actuation component (min. actuation force 70 N)
Note
Compared to the mechanical locking device (see Fig. 32), actuation of the system's interrogation and actuation component is not prevented if the vacuum circuit-breaker is closed.
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Rating plate
Technical data
Fig. 47 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 sales representative.
The weight is given on the rating plate of the vacu um circuit-breaker (see Fig. 46) or
can be taken from the relevant dimension drawing.
Fig. 46 Example – vacuum circuit-breaker rating plate 3AH3
a Manufacturer
b Type designation
c Works serial number
d Rated voltage U
r
e Rated frequency f
r
f Rated short-circuit breaking current I
sc
g Rated power frequency withstand
voltage U
d
h Rated lightning impulse withstand
voltage U
p
i Quality control seal
k Year of manufacture
m Rated operating current I
r
n Rated short-circuit duration t
k
oMass m
p Rated operating sequence
r Classification to standard
Rated voltage* U
r
kV 7.2 12 15 17.5 24 36 (40.5)**
Rated operating current I
r
A 1250, 2500, 3150, 4000
2500,
3150,
4000
1250, 2000,
2500, 3150,
4000
2500, 3150,
4000
Rated lightning impulse withstand
voltage (peak value) U
p
kV 60 75 95 95 110, 125
170
(185)**/(195)**
Rated power frequency withstand
voltage (effective value) U
d
kV
20
(42)**
28
(42)**
36
(42)**
38
(42)**
50
70
(85)**/(95)**
Rated short-circuit breaking currentI
sc
kA 50, 63 40, 50 31.5 40
Distance between pole centres mm 210, 275 275, 300 350 350
Rated operating sequence A, B, C A, B, C A**, B, C** A, B, C
A O - 3 min - CO - 3 min - CO; standard rated operating sequence
B O - 0.3 s - CO - 3 min - CO; up to I
sc
= 31.5 kA possible
C O - 0.3 s - CO - 15 s - CO; up to I
sc
= 31.5 kA possible
* In the event of a rated frequency fr of 50/60 Hz
** On request
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Ambient conditions
Installation altitudes
Insulating capacity 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 voltage values given in Fig. 47 are valid up to an installation altitude of 1,000 m above
sea level.
At altitudes of 1,000 m and higher, the insulation level must be corrected as shown
in Fig. 49:
3AH3 vacuum circuit-breakers are suitable for use in the
following climate classes in accordance with IEC 60721,
Part 3-3:
Class
• Climatic ambient conditions:
3K4
1)
,
3K6
2)
,
3Z2,
3Z5
• Biological ambient conditions: 3B1
• Mechanical ambient conditions: 3M2
• Chemically active substances:
3C2
3)
• Mechanically active substances:
3S2
4)
1) Peak value of the 24-hour means: +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. 48 Ambient conditions
U U0 K
a
U Rated withstand voltage U under standard reference
atmosphere
U
0
Required rated withstand voltage for the installation
location
K
a
Altitude correction factor
K
a
= em
(H – 1000)/8150
Calculating the altitude correction factor Ka:
H = Installation altitude in metres
m = 1 for AC voltage, lightning impulse 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 e
1
(2500 – 1000)/8150
75 kV 1.2
Fig. 49 Altitude correction factor K
a
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Switching times
Fig. 50 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) o f the openin g movement a nd
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 last pole to become extin ct (= opening time + arcing time).
Close/Open time = period in an OPEN/CLOSE cycle between the moment of con-
tact 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 th e start of current flow in the first pole.
Closing time < 75 ms
Opening time
1. shunt release (Y1) < 60 ms
2. and 3rd release (Y2, Y4, Y6, Y7) < 55 ms
Arcing time < 15 ms
Break time
1. shunt release (Y1) < 75 ms
2. and 3rd release (Y2, Y4, Y6, Y7) < 70 ms
Dead time 300 ms
Close/Open time
1. shunt release (Y1) < 90 ms
2. and 3rd release (Y2, Y4, Y6, Y7) < 70 ms
Minimum command duration
Closing solenoid (Y9) 45 ms
1. shunt release (Y1) 40 ms
2. and 3rd release (Y2, Y4, Y6, Y7) 20 ms
Shortest pulse time for breaker tripping signal
1. shunt release (Y1) > 15 ms
2. 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
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Circuit diagrams
The circuit diagrams show all the available components with their wiring options.
Fig. 51 to Fig. 57 show some non-binding examples of vacuum circuit-breakers.
The circuit diagrams for the vacuum circuit-breaker are com piled depending on your
order.
Mechanical manual closing and electrical closing
Fig. 51 Example – circuit diagram connection via low-voltage interface, 64-pole,
basic version
Electrical manual closing and electrical closing
Fig. 52 Example – circuit diagram with connection via low-voltage interface 64-
pole
This legend is also valid for the following circuit diagrams.
-Y1 -Y2 -Y4
-Y4 -Y5
-Y6 -Y7
-Y7
“OPEN” release
-Y1 -Y2 -Y4
-Y4 -Y5
-Y6 -Y7
-Y7
“OPEN” release
extended auxiliary switch
HA Manual opening
HE Manual closing
K1 Contactor relay (anti-pumping device)
M1 Motor
P Energy storage mechanism
R1 Resistor
S1 Auxiliary switch
S10, S11 Position switch (mechanical anti-pumping device)
S12 Position switch (prevents electrical closing if there is a
mechanical locking device)
S21, S22 Position switches (switch off the motor after charging)
S3 Position switch (opens when closing spring is charged)
S41, S42 Position switches (signal charging status)
S6, S7 Position switches (for circuit-breaker tripping signal)
X0 Low-voltage interface
Y1 1. shunt release
Y2 2. shunt release
Y4, Y5, Y6 Transformer-operated release
Y7 Undervoltage release
Y9 Closing solenoid
V6 Integrated rectifiers for motor
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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. 53 Sample circuit diagram 64-pole (part 1) of the vacuum circuit-breaker
a) b) c) d)
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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. 54 Sample circuit diagram (part 2) of the vacuum circuit-breaker
a) b) c) d)
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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. 55 Sample circuit diagram (part 3) of the vacuum circuit-breaker
a) b) c) d) e) f)
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The unassigned auxiliary switch terminals are wired up with the 64-pole plug bottom,
as shown.
Fig. 56 Example – auxiliary switch terminals
Fig. 57 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 con-
tact
Tripping via
NC contact
System wiring
Circuit-breaker wiring
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Mounting
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Mounting
Attachment in the switching cubicle
The vacuum circuit-breaker is delivered in the OPEN switching position. Before
installing the vacuum circuit-breaker, remove the transport aids (see “Unpacking (I)”
on page 6 and “Unpacking (III)” on page 12).
Check data Before installing the vacuum circuit-breaker in a switching cubicle, check the details
on the rating plate (see “Rating plate” on page 35) in order to avoid confusion.
Mounting position The 3AH3 vacuum circuit-breaker can only be installed vertically (to the vacuum
interrupter), as an indoor withdrawable section and as an indoor fixed installation.
DANGER
High-voltage – danger to life
Touching live parts causes an electric shock.
• Do not touch live parts!
• When performing work on the switchgear, de-energise it and earth it.
• The work described in the following sections must only be performed when
the switchgear has been de-energised:
- 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 injury due to 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.
Fig. 58 Mounting position
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Mounting
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Mounting the partitions Carefully take the partitions out of the packaging (see Fig.4) and mount according
to the supplied mounting drawing.
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 relevant.
The framework must be made to suit the operating conditions and have sufficient
load bearing capacity and stability.
* bores for M12 screws
Fig. 59 Example of mounted partitions
Fig. 60 Fastening options Fig. 61 View Y and Z
9862-26
15.
9862-27
60.
Y
Z
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Mounting
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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 for the earth wire with th e M12 hexagon screw and washe r
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 3AH3 vacuum circuit-breaker is installed into an earthed metal frame and is
connected permanently and electrically conductive, no separate earthing is
required.
Place serrated washers under the screw heads when fastening the vacuum circuit-breaker in this case.
Fig. 62 Earth terminal Fig. 63 Connecting earth wire
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Removing the transport securing device from the undervoltage release
Undervoltage release (Y7)
available?
The vacuum circuit-breaker with an underv olta ge release (Y7) 3AX1 103 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. 64 Removing the cover Fig. 65 Removing the transport securing device
A
B
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Mounting
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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 carefully brush the contact areas (cross-wise) of the busbars
until they are metallically bright and wipe off any residue using 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 49).
Note
Grease the busbars with contact grease prior to mounting.
Fig. 66 Cleaning the contact areas Fig. 67 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.
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Mounting
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Corresponding to the rated current stren gth, use M12 screws and nuts – strength
class 8.8 – for connection of the busbars and use the appropriate spring elements
and washers.
When tightening the screws, hold the n uts 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.
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.
Fig. 68 Installing busbars flat Fig. 69 Installing busbars flat
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Operation
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Operation
Commissioning
Before commissioning, check the f ollowing po ints to e nsure tha t the 3A H3 vacuu m
circuit-breaker 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 35) match the order
data?
Ensure correct operating voltage.
If necessary, clean the vacuum circuit-breaker (details on this in section
“Cleaning” on page 53).
Check that screw connections are tightened securely.
Check terminal strip plug-connection for tightness.
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 46)?
Test switching without supply voltage
Charge the closing spring (62.) with the hand crank (50.) (see Fig. 70),
then actuate the CLOSE pushbutton (53.) and, once closing has been
performed, actuate OPEN pushbutton (54.).
Test switching with supply voltage
To perform test switching with the motor, switch on the supply voltage.
The motor starts up immediately and charges the closing spring (62.).
Check the 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 3AH3 vacuum circuit-breaker
to do so.
Check functioning of the closing solenoid Y9 (53.1) and all available sh unt
releases by operating them electrically.
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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 cran k coupling (50.5) throug h the
opening (50.1) with the adapter pushed forward (50.6).
2. Turn clockwise until the spring state indicator (55.) cha nges over:
WARNING
Do not commission the vacuum circuit-breaker if there are malfunctions.
If the malfunctions or the damage cannot be re medied, contact a sales repres ent-
ative or Siemens Service and, if necessary, send back the vacuum circuitbreaker.
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 circuitbreaker must be charged only using the original hand crank.
Discharged Charged
Fig. 70 Charging the closing spring with the hand
crank
Fig. 71 Operating elements and spring state indicator
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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 locking device, send the closing
command via the CLOSE pushbutton (53.) or the corresponding command ele ment
until the vacuum circuit-breaker is closed and shows and signals the CLOSED
switching position.
Change of the position indicator (59.):
After switching on and possibly releasing the CLOSE 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 corre-
sponding command element until the vacuum circuit-breaker is open and sh ows and
signals the OPEN switching position.
Change of the position indicator (59.) after electrical opening:
The spring state indicator (55.) does not change.
Discharging the closing spring
To discharge the closing spring:
• the supply voltage must be deactivated
• the vacuum circuit-breaker must be closed manually (see “Closing” on page 51)
and then
• opened manually (see “Opening” on page 51).
OPEN CLOSED
Charged Discharged Charged
Note
If an undervoltage release 3AX1103… is fitted, it must be connected to the control
voltage for switching operations (mechanical or electrical), as otherwise closing
is not possible.
CLOSED OPEN
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Operation
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Blank page
Page 53
Maintenance
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Maintenance
Maintenance and servicing
Maintenance
The 3AH3vacuum circuit-breaker is maintenance-free under normal operating conditions. We do, however, recommend you carry out regular visual inspections. The
maximum permitted mechanical operating cycle number is 10 000.
Cleaning
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.
Joints and bearings that cannot be disassembled must not be washed out with a
detergent prior to work.
DANGER
High voltage – danger to life
Touching live parts 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 neighbouring live parts
*
)
On the vacuum circuit-breaker, actuate the OPEN, CLOSE and OPEN pushbut-
tons manually one after the other. This ensures that the vacuum circuit-breaker
is open and the closing spring is discharged.
Note
The vacuum circuit-breaker should be taken out of the switch cabinet or switchgear for servicing.
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Special operating conditions
If the vacuum circuit-breaker is operated under unfavourable 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.
For this, only the following agents may be used on the individual functional parts of
the circuit breaker:
Lubricant:
Lubricants are available from the responsible Siemens representative:
Fig. 72 Bearings and sliding surfaces of the pole side
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
Order no.
180 g Isoflex Topas L 32 3AX11 33-3H
1 kg Shell Tellus Oil 32 (special oil) 3AX1 1 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
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Fig. 73 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
kOPEN-latch
l Curve for OPEN-latch
m End stop
s Contact area of instantaneous release
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Interrupter service life
If switching operations occur frequently under overload or short circuit, the service
life of the vacuum interrupters may be reached prematurely.
Replace the interrupters after reaching the maximum permitted operating cycle
number of 10 000 mechanical or electrical load setting changes (up to the rated current).
When ordering vacuum interrupters, please always state the circuit-breaker type
and serial number (see “Rating plate” on page 35).
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. 74 Accessories available for order
Always specify the vacuum circuit-breaker's type and serial no. (see “Rating plate”
on page 35) when ordering spare parts.
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 disconnect the low-voltage plug or clip connection.
Accessory/spare part Order no. Comments
Operating instructions 9229 9860 100
Hand crank 3AX1530-2B
Lubricant
see “Special operating conditions” on page 54
Vaseline (contact grease)
e. g. Atlantic white, Atlantic Mineralölwerk GmbH
Pasty consistency, flame point
210 °C, low acid
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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 sales representative.
Disposal
The materials of the vacuum circuit-breake r should be recycled. Disposal of the vacuum circuit-breaker with minimum environmental impact is possible on the basis of
existing legal regulations.
Metal The circuit breaker's metal components can be recycled as mixed scrap, although it
is more environmentally sustainable to dismantle the unit as thoroughly as possible
into sorted scrap and residual mixed scrap.
Electronics Electronic scrap must be disposed of in accordance with applicable regulations.
Materials The vacuum circuit-breaker consists of the following materials:
• Steel (partly phosphatised, galvanised and yellow chromated)
• Copper (partly silver-plated)
• Plastics (epoxy resin, polyamide, polyester, polycarbonate, ABS-PC mixture;
partly glass fibre 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 sub-
stances within the scope of the Hazardous Substances Ordnance 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 Service 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 sales representative.
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Index of keywords
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Index of keywords
A
Accessories available for order
............................. 56
Altitude correction factor
....................................... 36
Ambient conditions
................................................ 36
Angle lever
............................................................ 20
Auxiliary switch
............................................. 22– 23
B
Basic equipment
................................................... 23
Bearings and sliding surfaces
............................... 55
Busbars
................................................................. 48
C
Centering
.............................................................. 20
Circuit-breaker shaft
.............................................. 22
Circuit-breaker tripping signal
....................... 23, 27
Climate classes
..................................................... 36
Closing damper
..................................................... 22
Closing solenoid
.................................... 22– 23, 25
Closing spring
............................................... 22, 31
Contact pressure spring
........................................ 19
Contact stroke
....................................................... 20
Contact system
..................................................... 20
Contactor relay
.............................................. 22– 23
Contactor relay K1
................................................ 24
Cover
.................................................................... 21
Cut-out switch
....................................................... 27
D
Dashpot
................................................................. 22
Disconnected position
........................................... 32
Distance between pole centres
............................. 35
E
Earth terminal
................................................ 22, 45
Electrical manual closing
.............................. 23, 31
G
Gear unit
............................................................... 22
H
Hand crank
............................................................ 50
Hand crank coupling
............................................. 22
Heater (condensation water protection)
22– 23, 31
High-voltage protective earth
................................ 45
I
Installation altitudes
.............................................. 36
Insulating capacity
................................................ 36
Insulating operating rods
....................................... 19
Interrupter
..................................................... 19– 20
Interrupter support
................................................ 20
Interrupter, service life
.......................................... 56
Interrupter, vacuum check
.................................... 56
L
Locking devices
.................................................... 32
Low-voltage interface
.................................... 22– 23
M
Mechanical anti-pumping device
........................... 23
Mechanical locking device
............................ 23, 32
Mechanical manual closing
......... ... ... ... .... ... . 23, 31
Mechanical manual opening
.............................. .... 23
Mechanism box
....... .... ... ... ... .... ... ................. 19, 22
Motor
........... ... ... ... ... .... ... .............................. 22– 24
Mounting position
........ ... ... ... .... ... ... ....................... 43
O
Opening spring
......................................... ... ... ... .... 22
Operating cycle counter
..................... ... .... ... . 22– 23
Operating position
............. ... .... ... ... ... ... ................. 32
Operating rod
.................. ... ... .... ... ... ... .................... 22
P
Plug-connector with sleeve housing
...................... 23
Pole assembly
.......................................... ... . 19– 20
Pole plate
..................... ... ... ... .... ... ... ....................... 19
Position indicator CLOSED-OPEN
........................ 22
Position switch
...................................... 22– 23, 27
Post insulator
............................... .......................... 19
Priority opening
..................... .... ... ... ... ... .... ............. 23
R
Range of application
................................. ............. 17
Rated frequency
.......................................... ... ... .... 35
Rated lightning impulse withstand voltage
............ 35
Rated operating current
.................................. ....... 35
Rated operating sequence
............. ... ... .... ... ... ... .... 35
Rated power frequency withstand voltage
............. 35
Rated short-circuit breaking current
......... ... ... ... .... 35
Rated short-circuit duration
......... ... ... ... .... ... ... ....... 35
Rated voltage
.......... .... ... ... ... .... ... .......................... 35
Rating plate
.......... ... .... ... ... ... .... .................... 22, 35
S
Shunt release
.......... .... ... ... ... .... ... .......................... 22
shunt release
........................................ 23, 25, 29
Spring charge release
....... ... .... ... ... ... ... ........ 23, 33
Spring state indicator
................................... . 21– 22
Standards
.......................................... ... .... ... ... ... .... 18
Strut
............................................. ... ... .................... 19
Switching times
..................... .... ... ... ... ... .... ............. 37
T
Terminal strip
............................... ................. 23, 28
Transformer-operated release
.............. 22– 23, 29
Transformer-operated release (0.1 Ws)
................ 22
U
Undervoltage release
........................... 22– 23, 30
V
Vacuum interrupter, contact system
...................... 20
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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. Interrupter
40. Lower interrupter support
48. Insulating operating rods
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. CLOSE pushbutton
53.1 Closing solenoid Y9
54. OPEN pushbutton
54.1 Shunt release Y1
54.2 Shunt release Y2
54.3 Transformer-operated release Y4
54.4 Undervoltage release Y7
54.5 Transformer-operated release (0.1Ws) Y6
55. Spring state indicator
55.1 Opening for spring state indicator
58. Operating cycle counter
58.1 Opening for operating cycle counter
59. Position indicator CLOSED-OPEN
59.1 Opening for position indicator CLOSEDOPEN
60. Mechanism box
60.1 Cover
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 R01 (condensation water protection)
72. Spring charge release
72.1 Lever of the spring charge release
90. Mechanical locking device
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Published by
Siemens AG
Infrastructure & Cities Sector
Low and Medium Voltage Division
Medium Voltage & Systems
Schaltwerk Berlin
Nonnendammallee 104
13629 Berlin
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