1. Vacuum circuit-breaker - high duty VD4

2. Vacuum circuit-breaker high duty
12 kV, 1250 – 2500 A, 40 – 63 kA
12 kV, 3150/40001) A, …63 kA
17.5 kV, 1250 – 2500 A, 40 kA
17.5 kV, 3150/40001) A, …40 kA
36 kV, 1250 – 3150 A, …40 kA
40.5 kV, 1250 – 3150 A, …31.5 kA
1) Breaker with fan-cooling

3. Rated short-circuit breaking current symm.2) kA 40 50 63 20…50 20…40
Rated voltage1) kV 12
17.5 36
40.5
Rated current A
1250…2500
3150/40003)
Rated short-circuit breaking current symm.2) kA 40 50 63
20…50
20…40
25/31.5
Short-circuit breaking current asymm.2)
43.6
55.8
65.5 ,8
27.3/34.3
Rated short-circuit making current2)
100
125
158
30…125
50…100
63…100
63/80
Rated short circuit duration s 3
Dimensions p H a b c d e
210/2754)
310
570/700
424
433
237.5
5995)
600/750
459
608
275
750
677.56)
635.56)
280/3607)
328
895/10008)
555/686 -
900
1575
280
895
686
Weight kg
94…180
147…260
260
290…350
Embedded pole •
Assembled pole
The switchgear complies with the following
specifications in according with DIN VDE and relevant IEC publications:
• VDE 0670, Teil 1000 and IEC 60694
• DIN VDE 0670,Teil 1 and IEC
1) Test voltage according to DIN VDE 0670,
part 1000, list 2
2) When the operating voltage is lower than the rated voltage, the same values apply as for rated voltage
3) 4000 A breaker only with fan cooling
4) With rated current 2500 A only pole centres 275 mm
5) Breaker with heat-sink 616 mm 6) Breaker with heat sink
7) Pole centres 360 mm fixed version
Pole centres 280 mm withdraw. version
8) 1000 mm fixed version

4. 5) Version on withdrawable part
12 kV, A, 40 kA 17.5 kV, A, 40 kA
p H a b c d e
mm mm mm mm mm mm mm
,)2)
),2)
12 kV, A, 50 kA
p H a b c d e mm mm mm mm mm mm mm
) 4594)
) 4594)
12 kV, A / 4000 A, kA kV, A, 63 kA 17.5 kV, A / 4000 A1), kA
) )
36 kV, A, kA
40.5 kV, A, 25/31.5 kA
p H a b d e mm mm mm mm mm mm
2805) ) 6865)
3606) ) 5556)
Shown: 12 kV, 2500 A, 40 kA
1) Measuring point pole part
4) Max. width or depth
2) Pole with heat-sink 616 mm
5) Version on withdrawable part
3) Pole with heat-sink
6) Fixed version

5. VD4 vacuum circuit-breakers are well suited for switching of:
short-circuit currents
overhead lines under load and no-load conditions
transformers under load and no-load conditions
ripple control systems
capacitors
motors

6. Vacuum interrupter (principle structure )1 2 3
1 Stem / Terminal
2 Twist protection
3 Metal bellow
4 Interrupter lid
5 Shield
6 Ceramic insulator
7 Shield
8 Contacts
9 Stem / Terminal
10 Interrupter lid 4 5 6 7 8 9 10 E

7. Embedded pole (principle structure)1
1 Upper terminal
2 Vacuum interrupter
3 Epoxy resin
4 Stem
5 Lower terminal
6 Movable contact
7 Contact force spring
8 Push rod
9 Fixing point
Connection to operating mechanism 2 3 4 5 6 7 8 9 10

8. of vacuum circuit-breaker VD4 - high duty
Operating mechanism
of vacuum circuit-breaker VD4 - high duty
Shown: VD

9. Vacuum circuit-breaker on
withdrawable part intended for indoor installation in air-insulated switchgear systems (front view)
Shown: VD

10. Vacuum circuit-breaker on
withdrawable part intended for indoor installation in air-insulated switchgear systems (pole view)
Shown: VD

11. Vacuum circuit-breaker on truck
36 kV, ) A, ) kA
40.5 kV, ) A, kA
1) 3150 A in assembled pole 2) 40 kA in assembled pole
Shown: VD

12. with spring operating mechanism
12/17.5 kV, A1), 40 kA 1 2 3 4 7 8 9 6 5
1) 2500 A with heat-sink
1 Upper terminal
2 Vacuum interrupter
3 Epoxy resin
4 MC-contact
5 Lower terminal
6 Piston
7 Contact force spring
8 Push rod
9 Mechanism enclosure
with spring operating mechanism
Shown: Vacuum circuit-breaker, type VD4, in embedded technique 12 kV, 2000 A, 40 kA

13. 8 Mechanism enclosure with spring operating mechanism1 2 3 4 5 6 7 8
12 kV, 1250 A – 2500 A kA 12 kV, 3150 A / 40001) A …50 kA
1) Breaker with fan-cooling
1 Upper terminal
2 Vacuum interrupter
3 Epoxy resin
4 Lower terminal
5 Flexible connection
6 Contact force spring
7 Push rod
8 Mechanism enclosure with spring operating mechanism
Shown: Vacuum circuit-breaker, type VD4, in embedded technique 12 kV, 2000 A, 50 kA

14. 8 Mechanism enclosure with spring operating mechanism
12 kV, 1250 – 3150 A / 40001) A, kA
17.5 kV, 1250 – 3150 A / 40001) A, kA
1) Breaker with fan-cooling 1 8 2
1 Upper terminal
2 Vacuum interrupter
3 Epoxy resin
4 Lower terminal
5 Roller contact
6 Contact force spring
7 Push rod
8 Mechanism enclosure with spring operating mechanism 3 4 5 6 7
Shown: Vacuum circuit-breaker, type VD4, with assembled poles

15. 36/40.5 kV, ...2500 A, ...31.5 kA with embedded pole 1 Upper terminal7
1 Upper terminal
2 Vacuum interrupter
3 Epoxy resin
4 Lower terminal
5 Flexible connection
6 Push rod
7 Mechanism enclosure
with spring operating mechanism
Shown: Vacuum circuit-breaker, type VD4, in embedded technique 12 kV, 2000 A, 31.5 kA