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VD4

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The China VD4 series vacuum circuit-breakers are devices for indoor switchgear installation. Please contact ROCKWILL for special installation requirements. VD4-R series medium voltage vacuum circuit breakers with lateral operating mechanism for indoor installation feature the separate pole construction technique. Each pole houses a vacuum interrupter which is encased in the resin when the cylinder is moulded thanks to a special manufacturing process. This construction method protects the vacuum interrupter from shock, pollution and condensation.

The operating mechanism is the trip-free stored energy type with independent opening and closing regardless of the operator's action. The operating mechanism is widely used in all VD4-R series circuit-breakers with frontal control.

The circuit-breaker can be remote controlled when fitted with dedicated electrical accessories (gearmotor, opening and closing release).

The operating mechanism, the three poles and the current sensors (if provided) are installed on a metal frame without wheels. The construction is particularly compact, sturdy and of limited weight.

VD4-R series circuit-breakers with lateral operating mechanisms are life-long sealed pressure devices.(Standards IEC 62271-100)



Vacuum Circuit-breaker

 

VD4/R 12

VD4/R 17

VD4/R 24

Standards

 

Rated voltage

Ur(kV)

12

17.5

24

Rated insulation voltage

Us(kV)

12

17.5

24

Withstand voltage at 50Hz

Ud(kV)

28

38

50

Impulse withstand voltage

Up(kV)

75

95

125

Rated frequency

fr(Hz)

50-60

50-60

50-60

Rated thermal current

Ir(A)

630

800

1250

630

800

1250

630

800

1250

Rated duty breaking capacity(symmetrical rated short-circuit current)




Isc(kA)




12.5

-

-

12.5

-

-

12.5

-

-

16

16

16

16

16

16

16

16

16

20

20

20

20

20

20

20

20

20

25

25

25

25

25

25

-

-

-

Short-time withstand current(3s)




Ik(kA)




12.5

-

-

12.5

-

-

12.5

-

-

16

16

16

16

16

16

16

16

16

20

20

20

20

20

20

20

20

20

25

25

25

25

25

25

-

-

-

Making capacity




Ip(kA)




31.5

-

-

31.5

-

-

31.5

-

-

40

40

40

40

40

40

40

40

40

50

50

50

50

50

50

50

50

50

63

63

63

63

63

63

-

-

-

Making capacity

 

Opening time

(ms)

40…60

40…60

40…60

Arcing time

(ms)

10…15

10…15

10…15

Total break-time

(ms)

50…75

50…75

50…75

Closing time

(ms)

30…60

30…60

30…60




●Code

●Available versions

1.Closing pushbutton

VD4 circuit-breakers with lateral operating mechanism are available in the following versions:

2.open/closed indicator




3.Discharged

Center-distance P =( )mm







Fixed

Removable

4.Operation counter

210

210

5.Manually charging handle

230

230

6.Opening pushbutton

250

250

7.Protection relay

275

275

8.Delivery terminal box

300

300

9.Current transformer

310

310

10.Polo

 

 

 



VD4

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