Answer Posted / tej4fun
VCB stands for Vacuum Circuit Breaker
As the name suggests that the phenomenon of arc quenching will happen in Vacuum medium.
It is generally used in MV applications(3.3-36KV)
The main advantages of VCB being it has high dielectric strength(8 Times higher than air and 4 times higher than SF6) which makes it easier to quench the arc with less gap between the contacts. Also the life of VCB is considerably high owing to less maintenance and ease of Vacuum bottle replacement. Also unlike SF6 it is not a harmful to environment and less dangerous comparative to OIL CB. Generally the pressure maintained in Vacuum chamber is 10^-6 bar.
Regards
Raviteja V
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