Answer: In vacuum circuit breaker be used vacuum as a arc quenching medium. Like other circuit breaker there are also open and closed contacts in vacuum circuit breaker. Following is the list of materials used for manufacturing contact of vacuum circuit breaker
These are the some of alloy employed as contact material in vacuum circuit breaker.
The material used for current carrying contacts plays an important role in the performance of the vacuum circuit breaker. The alloys like, Copper-bismuth or copper-chrome are the ideal material to make VCB contacts.