Q. How does a vacuum circuit breaker works?

Answer

This circuit breaker uses a high vacuum as a medium to extinguish the arc generated due to the action of circuit breaker when protecting an electrical circuit from damage caused by short circuit overload high current or voltage. This is the working principle of a vacuum circuit breaker (VCB). An arc is typically cooled down between 30 ms and 150 ms after the mechanism – it is a fast and efficient process.