VS-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 do, especially for frequent operations in various places . This product complies with GB11022 "high-voltage switchgear and control equipment standards of common technical requirements", GB1984 "AC High Voltage Circuit Breaker" and IEC56 "high voltage AC circuit breakers" and other standards.