What is VCB? 

VCB is known as vacuum circuit breaker. And vacuum circuit breaker is a type of medium voltage circuit breaker. Circuit breakers are all about extinguishing high-tripping currents or arcs generated in power-off conditions. So, when vacuum is used to extinguish the arc, it is known as vacuum circuit breaker. VCB is used at voltage of 11KV to 33KV. A large amount of arcing occurs when the stationary and moving contacts move away from each other during a trip or off condition. In this circuit breaker, since arcing occurs in a vacuum enclosure, the dielectric strength of the vacuum increases during arcing. In this circuit breaker, since arcing occurs in a vacuum enclosure, the dielectric strength of the vacuum increases during arcing. This automatically reduces or cancels the high current generated. It has a dielectric recovery character, excellent interruption and can interrupt the high-frequency current caused by arc instability, which is superimposed on the line frequency current.