VS-40.5 type indoor high voltage vacuum circuit breaker 1. 40.5kV indoor VCB 2. 3 phase 3. Passed test, ISO VS-40.5 type indoor high voltage vacuum circuit breakerVS-40.5 type indoor high voltage vacuum circuit breaker is mainly used for rated voltage of 40.5kV, three-phase AC 50Hz power system, for industrial and mining enterprises, power plants and substation protection and control purposes to ...