Product Definition

VZ4-12 vacuum circuit breaker is a kind of high-voltage electrical equipment used in power system, which has reliable insulation performance and efficient electrical disconnection function. As a high-voltage electrical appliance, the VZ4-12 type vacuum circuit breaker is suitable for AC 50Hz, rated voltage 12kV power system, used to control and protect the load in the circuit.

　　Scope of application and advantages

Its main advantages are small size, light weight, convenient operation, high reliability, and easy maintenance. In addition, it also has good durability and electrical performance, and can withstand abnormal conditions such as instantaneous overcurrent and short-circuit current to ensure the normal operation of the power system. In short, VZ4-12 vacuum circuit breaker is an efficient and reliable electrical equipment, widely used in electric power, metallurgy, petrochemical and other fields.

Main technical parameters of products

Serial Number

الاسم

Unit

Numerical

1

Rated voltage

kV

12

2

Rated insulation level

1min power frequency withstand voltage (effective value)

42

Lightning impulse withstand voltage (peak)

75

3

Rated short-circuit breaking current

kA

20

25

31.5

40

4

Rated current

A

630

 1250

630 1250

1600 2000

2500 3150

630 1250

1600 2000

2500 3150

4000

5

Rated thermal stability current (effective value)

kA

20

25

31.5

40

6

Rated dynamic stability current (peak value)

50

63

80

100

7

Rated short-circuit closing current (peak)

50

63

80

100

8

Rated short-circuit start current breaking times

Times

80

80

50

30

9

Power frequency withstand voltage of secondary circuit (1min)

V

2000

10

Rated operating sequence

Points ~ 0.3s combined points ~ 180s combined points

Points ~ 180s ~ combined points ~ 180s ~ combined points (40kV)

10

Rated thermal stability time

S

4

11

Rated single/back-to-back capacitor bank breaking current

A

630/400

800/400

12

Mechanical life

Times

20000