The CV2-12/T (V) indoor high-voltage vacuum circuit breaker (hereinafter referred to as the circuit breaker) is a medium voltage circuit breaker with solidly sealed pole insulation method as the main electrical circuit The operating mechanism of the circuit breaker adopts VS1 type mechanism. The fixed sealed pole structure eliminates the influence of dust and moisture on the outdoor insulation capacity of vacuum arc extinguishing. break Circuit breakers are mainly used for control and protection in power grids with AC 50Hz and rated voltage of 12kV and below, and are widely used in industrial and mining enterprises, substations Suitable for humid and tropical areas.