The vacuum circuit breaker (VCB) employs the vacuum interrupter (VI) which has excellent interrupting efficiency. It has passed a series of type-tests and is designed, tested and manufactured in accordance with IEC and BS standards under very rigorous controls. We are equipped with a very sophisticated and highly flexible manufacturing setup to make VCB which can withstand operating current up to 2000A. The four major types are as follow:
Type
VJ-12
VJ-12B*
VJ-13
VJ-22
Rated voltage (kV)
12
15
24
Rated normal current (A)
630/1250
630/1250/2000
1250/2000
630/1250/2000
Rated short-circuit Breaking current (kA)
25
31.5
25
Rated short-circuit Withstand current (kA)
25 - 3 sec
31.5 -3 sec
25 - 3 sec
Rated break time (ms)
60
70
Rated opening time (ms)
40
50
Closing time (ms)
50
Rated operating sequence (ms)
O - 0.3S - CO - 3 min - CO
Rated lightning impulse Withstand voltage (kV peak)
75
95
125
Rated frequency (Hz)
50/60
Rated transient recovery voltage kV/ms
0.34
0.39
0.47
Mass (Kg)
120/140
145/175/245
185/245
230/250/305
*VJ-12B supersedes and is downward-compatible with VJ-12A.
Certain degree of modifications can be made to the breaker. For example, the maximum operating current of a 630A breaker can be increased to 800A without changing the overall physical size. Manufacturing specialists are trained in Meidensha Corporation in Japan to ensure a high quality is achieved and maintained.
