12KV 3 Phase Vacuum Circuit Breaker - Indoor High Voltage

Item

Units

Parameters

Rated voltage

KV

12

Rated current

A

630-3150

Rated short- circuit breaking current

KA

20

31.5

40

Rated short- circuit closing current

KA

50

80

100

Rated dynamic steady electric current(peak)

KA

50

80

100

Rated thermal stability current(RMS)

KA

20

31.5

40

Rated thermal stability time

S

4

The breaking times of rated short circuit breaking current

Times

30 (50)

Open time of CD10 electromagnetic operating mechanism

mS

< 80

Rated operating sequence

O-0.3s-CO- 180s-CO

A minute power frequency withstand voltage(RMS)

KV

 The phase 42, section 48

Lightning shock pressure

KV

 The phase 75, section 85

Mechanical life

Times

 10000

 Note: 20KA,31.5KA   t=0.3s t 1= 180s    40KA t=180s t 1= 180s.

Power supply conditions

Within the factory production ZN28G-12 series indoor high voltage vacuum circuit breaker, can be equipped with CT17, CT19 spring mechanism and CD17 electromagnetic mechanism.

Ambient condition

1. Altitude:≤1000m;

2. The ambient temperature: not higher than +40℃. not less than 10℃(-30℃ is permitted storage)

3. Earthquake does not exceed degree 8;

4. Relative humidit: daily average value is not greater than 95%.monthly average is not greater than 90%; air relative humidity on average less than 2210-3Mpa. on average less than 1.810-3Mpa.

5. The surrounding air is not corrosive and flammable gas, steam and other significant plluion;