Vacuum circuit-breaker 3AH3 - Siemens AG · The vacuum circuit-breaker can be transported with the...

© Siemens AG 1996. All rights reserved.

3AH3

Vacuum circuit-breaker3AH30 ... 3AH33

OPERATING INSTRUCTIONS

Order no.: 9229 9860 176 0EOrdering location: IC LMV LP PO P C41AG 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 vacuumcircuit-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 qualifica-tions corresponding to their activity, such as:

• training and authorization to energise, de-energise, clear, earth and tag circuitsand equipment in accordance with established safety practices.

• training in the proper care and use of protective equipment in accordance withestablished safety practices;

• training in providing first aid.Product liability

DANGERsignal word used to indicate an imminently hazardous situation which,

if not avoided, will result in death or serious injury.

WARNINGsignal word used to indicate a potentially hazardous situation which,

if not avoided, could result in death or serious injury.

CAUTIONsignal word used to indicate a potentially hazardous situation which,

if not avoided, could result in minor or moderate injury.

Noteindicates a potentially damaging situation.

If the damaging situation is not avoided, the product or something in its vicinity may sustain damage.

NoteProduct liability claims are upheld only if the replacement of the purchased spare parts is performed by personnel that have been trained and certified by Sie-mens.

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Table of contents

For your safety ................................................................................................................................................... 2

Transport, storage and packing .................................................................................................................. 5

Transport ...............................................................................................................................................................5Unpacking (I) .........................................................................................................................................................6Unpacking (II) ..................................................................................................................................................... 10Unpacking (III) .................................................................................................................................................... 12Reusing the transport unit .................................................................................................................................. 15Storage ...............................................................................................................................................................15

General information ....................................................................................................................................... 17

Range of application ...........................................................................................................................................17Standards ........................................................................................................................................................... 18Design approval as per X-Ray Ordinance ..........................................................................................................18Scope of delivery ................................................................................................................................................18

Description ........................................................................................................................................................ 19

Design .................................................................................................................................................................19Locking devices ................................................................................................................................................. 32Rating plate ........................................................................................................................................................ 35Technical data .....................................................................................................................................................35Ambient conditions ............................................................................................................................................. 36Installation altitudes ............................................................................................................................................36Switching times .................................................................................................................................................. 37Circuit diagrams ................................................................................................................................................. 38

Mounting ............................................................................................................................................................. 43

Attachment in the switching cubicle ....................................................................................................................43Earthing .............................................................................................................................................................. 45Electrical connection of the prime conductor ..................................................................................................... 47

Operation ............................................................................................................................................................ 49

Commissioning ...................................................................................................................................................49First closing operation .........................................................................................................................................50Closing ................................................................................................................................................................51Opening ..............................................................................................................................................................51

Maintenance ...................................................................................................................................................... 53

Maintenance and servicing .................................................................................................................................53Interrupter service life ........................................................................................................................................ 56Accessories and spare parts ...............................................................................................................................56Manufacturer's product liability ........................................................................................................................... 57Disposal ..............................................................................................................................................................57Service ................................................................................................................................................................57

Index of keywords .......................................................................................................................................... 59

Legend for all pages ...................................................................................................................................... 61

NoteSections with Addendum (I), (II) or (III)Sections with Addendum (I) refer to vacuum circuit-breakers with a rated operating current of < 3150 A. Sectionswith Addendum (II) refer to vacuum circuit-breakers packed with brackets with vertical connecting bars and a ratedoperating current of ≤ 4000 A. Sections with Addendum (III) refer to vacuum circuit-breakers with a rated operatingcurrent of 3150 A.If no addendum is given, the information is applicable for all 3AH3 vacuum circuit-breakers.

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Transport, storage and packing

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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 inter-mediate storage.

Transport vacuum circuit-breaker in the original transport unit up to the installationsite or storage location.

Transporting with crane or fork lift

WARNINGHeavy 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.

NoteObserve stacking height

For transport, no more than three constructionally identical transport units mustbe piled on top of each other.

Observe the loads specified on the transport unit.

NoteSecure 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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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 transportunit

• Check transport unit for damage.

• Major damage must be documented photographically.

• Ensure that any damage to the transport unit is confirmed by the transport com-pany.

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.

CAUTIONRisk of injury from sharp edges!

Fasteners may break, leaving sharp edges.

Always use a suitable tool to lever out fasteners.

NoteDo not cut open or damage the carton, since it is designed to be reused andbecause 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 straps(see Fig. 5).

Fig. 3 Removing the carton


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• Remove partitions and accessory pack and store safely in the packaging forlater 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 transportunit (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.

NoteDo 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).

NoteCarrying 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 notcompressed.

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 ofsquare timber can be placed underneath.

NoteWhen fastening the eyebolts to the pole heads, ensure that the contact surfacesare not damaged.

Fig. 6 Removing the tensioning belts Fig. 7 Screwing in eyebolts and lifting the vacuum circuit-breaker

NotePlace pieces of square timber onto the pallet in such a way that the insulatingoperating rods, contact pressure springs, angle levers and dashpots are not dam-aged 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 worksteps.

Fig. 8 Positioning the square timbers and setting down the vacuum circuit-breaker

Fig. 9 Transporting without pallet


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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 forlater 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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Transporting withoutbrackets

• Only lift the vacuum circuit-breaker far enough to put all sling gear under ten-sion.

• 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 ter-minals.

• Remove angle plate below mechanism box.


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.

NoteDo 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 later 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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Transporting to the instal-lation site

• Hook crane hooks into the transport screws and into the openings on the mech-anism box.

• Observe crane hook symbols.

• Vertically lift out vacuum circuit-breaker.


CAUTIONCrushing 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

NoteKeep partitions and accessory pack ready for the installation.


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Reusing the transport unitReusing 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 appropriatetools.

• 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 areturned goods number (see also “Service”, on page 57).

• When returning a vacuum circuit-breaker, always indicate the type and serialnumber (see “Rating plate”, on page 35).

Storage

NoteStore the vacuum circuit-breaker in the following condition:

• OPEN switching position

• Closing spring discharged

NoteRisk of corrosion damage if stored improperly!

If the storage conditions listed below are met, the vacuum circuit-breaker can bestored for up to a year in its transport unit.

If the storage conditions are not met, the vacuum circuit-breaker cannot be storedin the transport unit any longer than 6 months.

If storage of longer than one year is planned, unpack the vacuum circuit-breakerfrom the transport unit. Further storage may necessitate fresh corrosion protec-tion, 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 rela-tive humidity of less than 60 %.

unopenedmax. 6 months

-40 °C to +55 °C — max. 4

unopenedmax. 1 year

-5 °C to +40 °C — max. 4

open over 1 year -5 °C to +40 °Cif necessary, with new corro-sion protection

—


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General information

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General information

Smooth and safe operation of this device requires proper transport and storage, andprofessional installation and assembly, as well as careful operation and mainte-nance.

The basic version and all listed configurations of the vacuum circuit-breakers aretype-tested devices as per IEC.

Range of application3AH3 vacuum circuit-breakers are 3-pole interior circuit-breakers for a rated voltagerange of 7.2 kV - 36 kV.

Under normal operating conditions, the vacuum circuit-breaker (as per IEC 62271-1and 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.

WARNINGDangerous voltage and mechanical movements

When operating electrical devices, certain parts will always be live, andmechanical parts may move very quickly, even when remotely controlled.

If the warnings are not observed, serious injury or damage to material may be theresult.

Only personnel with the relevant qualifications may work on or in the vicinity ofthis device. These personnel must be familiar with all the warnings and servicingmeasures specified in these operating instructions.

NoteIn the event of subsequent attachments or integrations, e. g. locking parts in con-nection 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 cus-tomer, we recommend consulting the factory, since tried and tested solutions arefrequently available (see also “Additional equipment” on page 23).

General information

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StandardsThe 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- andM2-class circuit-breakers in accordance with IEC 62271-100.

Design approval as per X-Ray OrdinanceThe vacuum interrupters installed in the vacuum circuit-breakers are of a designapproved 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 andAnnex II No. 5 up to the level of the rated voltage stipulated according to DINVDE/IEC.

Scope of deliveryDelivery 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

Description

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Description

DesignVacuum 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 (16.1and 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

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 externalforces.

Contact system in the interrupters

A slight change in the contact stroke that occurs over the entire useful life of theinterrupter has no effect on the function of the vacuum circuit-breaker. There is noneed for a status indicator for the contact system.

Fig. 23 Pole assembly (I) Fig. 24 Pole assembly (II and III)

19. Pole assembly 29.1 Flexible connector

20. Upper interrupter 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

Description

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Mechanism box The mechanism box (60.) contains all the electrical and mechanical componentsrequired 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 themotor fails, the closing spring can be charged with a hand crank (50.). There is anopening (50.1) for this in the cover, behind which you will find the hand crank cou-pling (50.5) of the gear unit (50.2).

Indicators The charged state of the springs is indicated via the spring state indicator (55.). Theposition indicator (59.) shows the CLOSED or OPEN state. The operating cyclecounter (58.) indicates the number of operating cycles. An operating cycle consistsof one closing and one opening. The rating plate (51.) is attached to the mechanismbox 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

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


54.3 Transformer-operated release Y4

54.4 Undervoltage release Y7

54.5 Transformer-operated release (0.1 Ws) Y6


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)

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 following equipment:

In addition to the serial shunt release (Y1), the vacuum circuit-breaker can beequipped with a maximum of 2 releases of the type 3AX11.

For the permitted possible combinations of the additional equipment as well as spe-cial designs, refer to catalogue HG11, or contact the responsible sales representa-tive.

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-pole

• Plug-connector with sleeve housing 24-pole

• Terminal strip (X1)

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)

Heater (condensation water protection)1) (R01)

Electrical manual closing2)

Mechanical locking device1)

Spring charge release2)

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. 28 Recommendation for motor protection device

Contactor relay K1

After the supply voltage is applied and if the closingspring is discharged, the motor starts immediately andis automatically deactivated internally after charging hastaken 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 cur-rent for the required motor short-circuit protection.

Note: The motor protection devices are not included inthe delivery of the vacuum circuit-breaker and must beordered separately.

Fig. 27 Motor (50.4)

Rated supply voltage U*) VDC24

DC48

DC60

DC110

AC 50/60 Hz110

DC 220

AC 50/60 Hz230

Recommended rated current of the protective

device I**) A 16 10 6 4 6 2 3

If simultaneous CLOSE and OPEN commands are con-tinuously applied to the vacuum circuit-breaker, it returnsto the open position after being closed.

Via the function of the contactor relay K1, the vacuumcircuit-breaker pauses there until the CLOSE commandis given again.

This prevents continuous closing and opening (pump-ing).

Fig. 29 Contactor relay (69.)

Description

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Closing solenoid (Y9) 3AY1510

1st shunt release (Y1) 3AY1510

The closing solenoid Y9 unlatches the charged closingspring and switches the vacuum circuit-breaker on elec-trically. It is available for DC or AC voltage.

The closing solenoid Y9 is not designed for continuousoperation and is automatically deactivated within the cir-cuit-breaker.

The operator's supply voltage may deviate from therated supply voltage of the vacuum circuit-breaker by -15 % to 10 %.

The closing solenoid Y9 can be operated using AC or DCvoltage 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 electricallyfed tripping pulse is passed to the “OPEN” latch bymeans of a directly acting magnet armature, thus switch-ing off the vacuum circuit-breaker.

The 1st shunt release Y1 is not designed for continuousoperation and is automatically deactivated within thecircuit-breaker.

The operator's supply voltage may deviate from therated 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 orDC voltage and is protected against overvoltage.


Fig. 31 1st shunt release (54.1)

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 fordelivery: 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

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 thevacuum circuit-breaker is opened by means of an elec-trical 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. 35 Circuit-breaker tripping signal

Description

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Low-voltage interface X0, 64-pole

For connection of the control line, the standard version of the vacuum circuit-break-ers is equipped with a 64-pole low-voltage interface X0 (68.7).

The 64-pole plug (68.7.1) for the external terminal, is suitable for crimp terminationof control lines with a nominal cross-section of 1.5 mm2.

Terminal strip (optional) Instead of the 64-pole plug (68.7.1), a terminal strip (68.7.2) can be ordered as inter-face to the terminal at the customer's site.. Assignment of the terminals is doneaccording to the circuit diagram supplied.

Fig. 36 Low-voltage interface X0 Fig. 37 Terminal strip (optional)

Description

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A further shunt release, transformer-operated release, undervoltage release orinstantaneous 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 morethan one shunt release is needed.

In this version, the electrical “open” command is passedby means of a magnet armature to the “OPEN” latch byrelease of an energy storage mechanism, thus openingthe vacuum circuit-breaker. This opening solenoid is notdesigned for continuous operation. Any necessary varis-tors and rectifiers are integrated in the release.


Fig. 38 2. Shunt release (54.2)

The transformer-operated releases Y4, Y5 or Y6 consistof an energy storage mechanism, an unlatching fixtureand an electromagnetic system. If the tripping current isexceeded (90 % of the transformer-operated release'srated current), the energy storage mechanism isunlatched, thus initiating opening of the vacuum circuit-breaker.

For use of the transformer-operated release, matchingtransformers are also needed for matching, in addition tothe main current transformers.

Power consumption for 0.5 A and 1 A ≤ 6 VA at ≤ 90 %of the transformer-operated release's rated current andwith open armature.

Fig. 39 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 perma-nently applied to it when the vacuum circuit-breaker is in the closed state. If the volt-age drops below a certain value, the undervoltage release Y7 is unlatched, thusinitiating opening of the vacuum circuit-breaker via the stored energy mechanism.

Random tripping of the undervoltage release Y7 is generally performed by an NCcontact in the tripping circuit, but can also be done with the aid of an NO contact byshort-circuiting the solenoid coil. If this latter method is used, the solenoid coil'sshort-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 therated supply voltage drops to an inadmissible value. Any necessary varistors andrectifiers are integrated in the release.

Power consumption ≤ 6.5 W or ≤ 7.5 VA

NoteThe undervoltage release Y7 must only be operated with the supplied seriesresistor R1.

NoteFor switching operations (mechanical or electrical), the undervoltage release3AX1103… must be connected to control voltage, as otherwise closing is not pos-sible.

Fig. 40 Undervoltage release (54.4) Fig. 41 Typical circuit for connection of the undervolt-age release Y7

ABR1 resistor

S1 auxiliary switch

Y7 undervoltage release

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 bydirect mechanical unlatching of the closing spring. Instead of this mechanical man-ual closing, “electrical manual closing” is also available.

In this version, the closing circuit of the vacuum circuit-breaker module is electricallyactuated by a sensing device and must also be enabled via a command elementfrom the control room.

With on-site closing, this permits taking into account system-related interlocking andallows you to prevent unintentional closing by the control room, for example. Thisallows for interlocking the vacuum circuit-breaker module, for example, via the aux-iliary contact of a disconnector.

Vacuum circuit-breakers with electrical manual closing cannot be switchedmechanically.

The heater limits condensation and corrosion of the vac-uum circuit-breaker.

To this end, the heater has to be connected to the sup-ply voltage (see circuit diagram included with the deliv-ery).

The heater's surface temperature is at the most 180 °C.

Power consumption 50 W

Fig. 42 Heater (71.)

Description

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Locking devicesTo lock vacuum circuit-breakers as a function of the switching position, the springdrive mechanisms of the vacuum circuit-breaker can be equipped with a lockingdevice. This is also the case for vacuum circuit-breakers on switch gear trucks, inwithdrawable sections or with disconnectors.

Conditions The vacuum circuit-breaker must only be switched on in operating or disconnectedposition. The operating or disconnected position is the position of the vacuum circuit-breaker on the switchgear truck or withdrawable section in the switchgear. At thesame time, the vacuum circuit-breaker may be moved on the switchgear truck orwithdrawable 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 operatingposition (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 actu-ation component (b) is prevented. A mechanical system in the switchgear truck orwithdrawable section reliably blocks movements of the circuit-breaker on the switch-gear truck or withdrawable section.

OPEN switching position If the vacuum circuit-breaker is open, the sensing and actuation component (b) onthe system side actuates, via the stroke (a), the vacuum circuit-breaker's mechani-cal locking device and reliably blocks closing of the vacuum circuit-breaker.

Fig. 43 Mechanical locking device

The installation dimensions (c + d) for the sensing and actuation component (b) arein 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

Description

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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 release on the mechanism box locks the leverof the plug in idle position (a).

When the lever of the springcharge release is brought into operating position (b),opening is reliably done via the mechanics of the vacuum circuit-breakers and theclosing 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

NoteThe spring charge release can also be combined with a mechanical lockingdevice.

Description

34 9229 9860 176 0E2013-08-22

Priority opening

To lock the OPEN position, the drive mechanisms of the vacuum circuit-breaker canbe equipped with “priority opening”. This is also the case for vacuum circuit-breakerson switch gear trucks, in withdrawable sections or with disconnectors.

Fig. 45 Priority opening

The assembly “priority opening” has three positions. These positions are actuatedby an interrogation or actuation component in the system.

Trip-free position When actuating “priority opening” by putting into first position on the system (trip-freeposition, b), opening is triggered, closing is prevented and reclosing is reliably pre-vented as well.

Spring-dump position In the second position (spring-dump position, c) the vacuum circuit-breaker remainsin open condition.

In addition, when actuating the locking device in the second position, the closingspring is discharged by a no-load switching operation.

The closing and the opening springs are now discharged and hence all of the energystorages 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)

NoteCompared to the mechanical locking device (see Fig. 32), actuation of the sys-tem's interrogation and actuation component is not prevented if the vacuum cir-cuit-breaker is closed.

Description

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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 dimen-sion drawing. If required, these are available from your sales representative.The weight is given on the rating plate of the vacuum circuit-breaker (see Fig. 46) orcan 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 Ur

e Rated frequency fr

f 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* Ur kV 7.2 12 15 17.5 24 36 (40.5)**

Rated operating current Ir A 1250, 2500, 3150, 40002500, 3150, 4000

1250, 2000, 2500, 3150,

4000

2500, 3150, 4000

Rated lightning impulse withstand voltage (peak value) Up

kV 60 75 95 95 110, 125170

(185)**/(195)**

Rated power frequency withstand voltage (effective value) Ud

kV20

(42)**28

(42)**36

(42)**38

(42)**50

70 (85)**/(95)**

Rated short-circuit breaking cur-rentIsc

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 Isc = 31.5 kA possible

C O - 0.3 s - CO - 15 s - CO; up to Isc = 31.5 kA possible

* In the event of a rated frequency fr of 50/60 Hz

** On request

Description

36 9229 9860 176 0E2013-08-22

Ambient conditions

Installation altitudesInsulating 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 volt-age values given in Fig. 47 are valid up to an installation altitude of 1,000 m abovesea level.

At altitudes of 1,000 m and higher, the insulation level must be corrected as shownin Fig. 49:

3AH3 vacuum circuit-breakers are suitable for use in thefollowing 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 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 Ka

U Rated withstand voltage U under standard reference atmosphere

U0 Required rated withstand voltage for the installation location

Ka Altitude correction factor

Ka = em (H – 1000)/8150

Calculating the altitude correction factor Ka:H = Installation altitude in metresm = 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 alti-tude of 2,500 m, an insulation level of at least 90 kVunder standard reference atmosphere conditions isrequired:

90 kV 75 kV e1 (2500 – 1000)/8150

75 kV 1.2Fig. 49 Altitude correction factor Ka

Description

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Switching times

Fig. 50 Switching times

Closing time = period between starting (command) of the closing movement andthe moment of contact touch in all poles.

Opening time = period between starting (command) of the opening movement andopening 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 andextinction of the arc in the last pole to become extinct (= 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 beencancelled in all poles during subsequent opening.

Dead-time = period from the end of the current flow in all poles up to the start of cur-rent 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



Dead time 300 ms

Close/Open time



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

Description

38 9229 9860 176 0E2013-08-22

Circuit diagramsThe 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 compiled depending on yourorder.

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

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. 53 Sample circuit diagram 64-pole (part 1) of the vacuum circuit-breaker

a) b) c) d)

Description

40 9229 9860 176 0E2013-08-22



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)

Description

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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)

Description

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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

Mounting

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Mounting

Attachment in the switching cubicleThe vacuum circuit-breaker is delivered in the OPEN switching position. Beforeinstalling 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 detailson 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 vacuuminterrupter), as an indoor withdrawable section and as an indoor fixed installation.

DANGERHigh-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 andobserve the warning notices.

WARNINGRisk of injury due to wrong transport means!Using wrong transport means may cause the vacuum circuit-breaker to fall andinjure persons.• Observe weight.• Use means of transport suited to the requirements and load-carrying capac-

ity.• The vacuum circuit-breaker must not fall over.• Sharp edges may cause injury.

NoteFor 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

Mounting

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Mounting the partitions Carefully take the partitions out of the packaging (see Fig. 4) and mount accordingto 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 draw-ings are relevant.

The framework must be made to suit the operating conditions and have sufficientload 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

Mounting

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EarthingConnecting 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 termi-nal (70.).

• Tighten ring terminal for the earth wire with the M12 hexagon screw and washeron the earth terminal (70.) with 40 Nm.

Connect low-voltage Connect the low-voltage connecting cables in the customer's switch cabinet in sucha way that safe operation as per supplied circuit diagram is guaranteed.

NoteIf the 3AH3 vacuum circuit-breaker is installed into an earthed metal frame and isconnected permanently and electrically conductive, no separate earthing isrequired.

Place serrated washers under the screw heads when fastening the vacuum cir-cuit-breaker in this case.

Fig. 62 Earth terminal Fig. 63 Connecting earth wire

Mounting

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Removing the transport securing device from the undervoltage release

Undervoltage release (Y7)available?

The vacuum circuit-breaker with an undervoltage release (Y7) 3AX1103 is suppliedwith 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

AB

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 theholes 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 busbarsuntil 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.

DANGERHigh-voltage – danger to life

Test the vacuum circuit-breaker in the switchbay with high-voltage applied onlyafter faultless functioning has been ascertained (see “Commissioning” onpage 49).

NoteGrease the busbars with contact grease prior to mounting.

Fig. 66 Cleaning the contact areas Fig. 67 Cleaning the contact areas of the busbars

NoteClean silver spray-plated and copper spray-plated contact areas with a cloth, donot brush.

Different connection materials (AI/CU) must not be cleaned with the same clean-ing tools.

Silver-plated parts must not be bolted to aluminium bars/rails.

Mounting

48 9229 9860 176 0E2013-08-22

Corresponding to the rated current strength, use M12 screws and nuts – strengthclass 8.8 – for connection of the busbars and use the appropriate spring elementsand washers.

When tightening the screws, hold the nuts against tightening torque of 70 Nm witha suitable screwdriver or socket wrench.

Screw-in depths in the upper and lower terminals

See dimension drawings.

NoteFor vacuum circuit-breakers with connecting bars, it is recommended to use thestainless steel screws or non-magnetisable screws included in the accessorypack.

Fig. 68 Installing busbars flat Fig. 69 Installing busbars flat

Operation

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Operation

CommissioningBefore commissioning, check the following points to ensure that the 3AH3 vacuumcircuit-breaker is functioning faultlessly:

DANGERHigh 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 person-

nel who are familiar with the operating instructions and observe the warningnotices.

• Check through all of the items on the checklist and ensure correct functioningbefore 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 trans-port 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 shunt releases by operating them electrically.

Operation

50 9229 9860 176 0E2013-08-22

First closing operation

If all functions have been checked and are ok, switch on high-voltage while observ-ing 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 bythe 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:

WARNINGDo not commission the vacuum circuit-breaker if there are malfunctions.

If the malfunctions or the damage cannot be remedied, contact a sales represent-ative or Siemens Service and, if necessary, send back the vacuum circuit-breaker.

WARNINGRisk of injury if hand cranks other than the original hand crank are used.

When the supply voltage is present, the motor immediately recharges the springafter a closing operation. If the hand crank does not have a slip coupling, the handcrank 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.

Discharged Charged

Fig. 70 Charging the closing spring with the hand crank

Fig. 71 Operating elements and spring state indicator

Operation

9229 9860 176 0E 512013-08-22

The adapter (50.6) of the hand crank (50.) is designed in such a way that the handcrank becomes uncoupled when the motor supply voltage returns.

ClosingProvided there is no lock-out due to a mechanical locking device, send the closingcommand via the CLOSE pushbutton (53.) or the corresponding command elementuntil the vacuum circuit-breaker is closed and shows and signals the CLOSEDswitching position.

Change of the position indicator (59.):

After switching on and possibly releasing the CLOSE pushbutton (53.), the closingspring (62.) is immediately automatically charged by the motor and the indicator“Closing spring charged” (55.) becomes visible.

Change of the spring state indicator (55.):

OpeningThe 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 shows andsignals 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

NoteIf an undervoltage release 3AX1103… is fitted, it must be connected to the controlvoltage for switching operations (mechanical or electrical), as otherwise closingis not possible.

CLOSED OPEN

Operation

52 9229 9860 176 0E2013-08-22

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Maintenance

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Maintenance

Maintenance and servicing

Maintenance

The 3AH3vacuum circuit-breaker is maintenance-free under normal operating con-ditions. We do, however, recommend you carry out regular visual inspections. Themaximum 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 detergentadded and leave to dry.

Joints and bearings that cannot be disassembled must not be washed out with adetergent 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-voltageequipment 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-breakeris open and the closing spring is discharged.

NoteThe vacuum circuit-breaker should be taken out of the switch cabinet or switch-gear for servicing.

Maintenance

54 9229 9860 176 0E2013-08-22

Special operating conditions

If the vacuum circuit-breaker is operated under unfavourable conditions indoors(heavy and frequent condensation, dusty air, etc.), we recommend cleaning theinsulating parts and possibly the outer parts of the circuit-breaker at shorter inter-vals.

For this, only the following agents may be used on the individual functional parts ofthe 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) 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

9229 9860 176 0E 552013-08-22

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

k OPEN-latch

l Curve for OPEN-latch

m End stop

s Contact area of instantaneous release

Maintenance

56 9229 9860 176 0E2013-08-22

Interrupter service lifeIf switching operations occur frequently under overload or short circuit, the servicelife of the vacuum interrupters may be reached prematurely.

Replace the interrupters after reaching the maximum permitted operating cyclenumber of 10 000 mechanical or electrical load setting changes (up to the rated cur-rent).

When ordering vacuum interrupters, please always state the circuit-breaker typeand serial number (see “Rating plate” on page 35).

Accessories and spare partsReplacing 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.

CAUTIONRisk of injury!

The vacuum circuit-breaker should be taken out of the switch cabinet or switch-gear for servicing.

Separate vacuum circuit-breakers from the control feed voltage or switch it offand disconnect the low-voltage plug or clip connection.

Accessory/spare part Order no. Comments

Operating instructions 9229 9860 100

Hand crank 3AX1530-2B

Lubricantsee “Special operating condi-tions” on page 54

Vaseline (contact grease)e. g. Atlantic white, Atlantic Mineralölwerk GmbH

Pasty consistency, flame point 210 °C, low acid

Maintenance

9229 9860 176 0E 572013-08-22

Manufacturer's product liabilityThe 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 Sie-

mens.• 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 sub-mitted to the responsible sales representative.

DisposalThe materials of the vacuum circuit-breaker should be recycled. Disposal of the vac-uum 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 itis more environmentally sustainable to dismantle the unit as thoroughly as possibleinto 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 theterritory of the Federal Republic of Germany. For operation outside the FederalRepublic of Germany, the applicable local laws and regulations must be compliedwith.

Further information Contact your Siemens Service Center if you require further information.

ServiceFor 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: [email protected]• or any local sales representative.

Maintenance

58 9229 9860 176 0E2013-08-22

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Index of keywords

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Index of keywords

AAccessories available for order ............................. 56Altitude correction factor ....................................... 36Ambient conditions ................................................ 36Angle lever ............................................................ 20Auxiliary switch ............................................. 22– 23

BBasic equipment ................................................... 23Bearings and sliding surfaces ............................... 55Busbars ................................................................. 48

CCentering .............................................................. 20Circuit-breaker shaft .............................................. 22Circuit-breaker tripping signal ....................... 23, 27Climate classes ..................................................... 36Closing damper ..................................................... 22Closing solenoid .................................... 22– 23, 25Closing spring ............................................... 22, 31Contact pressure spring ........................................ 19Contact stroke ....................................................... 20Contact system ..................................................... 20Contactor relay .............................................. 22– 23Contactor relay K1 ................................................ 24Cover .................................................................... 21Cut-out switch ....................................................... 27

DDashpot ................................................................. 22Disconnected position ........................................... 32Distance between pole centres ............................. 35

EEarth terminal ................................................ 22, 45Electrical manual closing .............................. 23, 31

GGear unit ............................................................... 22

HHand crank ............................................................ 50Hand crank coupling ............................................. 22Heater (condensation water protection) 22– 23, 31High-voltage protective earth ................................ 45

IInstallation altitudes .............................................. 36Insulating capacity ................................................ 36Insulating operating rods ....................................... 19Interrupter ..................................................... 19– 20Interrupter support ................................................ 20Interrupter, service life .......................................... 56Interrupter, vacuum check .................................... 56

LLocking devices .................................................... 32Low-voltage interface .................................... 22– 23

MMechanical anti-pumping device ........................... 23Mechanical locking device ............................ 23, 32Mechanical manual closing .......................... 23, 31Mechanical manual opening .................................. 23Mechanism box ............................................ 19, 22Motor ............................................................ 22– 24Mounting position .................................................. 43

OOpening spring ...................................................... 22Operating cycle counter ................................ 22– 23Operating position ................................................. 32Operating rod ......................................................... 22

PPlug-connector with sleeve housing ...................... 23Pole assembly .............................................. 19– 20Pole plate ............................................................... 19Position indicator CLOSED-OPEN ........................ 22Position switch ...................................... 22– 23, 27Post insulator ......................................................... 19Priority opening ...................................................... 23

RRange of application .............................................. 17Rated frequency .................................................... 35Rated lightning impulse withstand voltage ............ 35Rated operating current ......................................... 35Rated operating sequence .................................... 35Rated power frequency withstand voltage ............. 35Rated short-circuit breaking current ...................... 35Rated short-circuit duration ................................... 35Rated voltage ........................................................ 35Rating plate .................................................. 22, 35

SShunt release ........................................................ 22shunt release ........................................ 23, 25, 29Spring charge release .................................. 23, 33Spring state indicator .................................... 21– 22Standards .............................................................. 18Strut ....................................................................... 19Switching times ...................................................... 37

TTerminal strip ................................................ 23, 28Transformer-operated release .............. 22– 23, 29Transformer-operated release (0.1 Ws) ................ 22

UUndervoltage release ........................... 22– 23, 30

VVacuum interrupter, contact system ...................... 20

Index of keywords

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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



54.3 Transformer-operated release Y4

54.4 Undervoltage release Y7

54.5 Transformer-operated release (0.1 Ws) Y6


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 CLOSED-OPEN

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 SectorLow and Medium Voltage DivisionMedium Voltage & SystemsSchaltwerk Berlin

Nonnendammallee 10413629 Berlin

Vacuum circuit-breaker 3AH3 - Siemens AG · The vacuum circuit-breaker can be transported with the...

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