outdoor high-voltage vacuum circuit breaker(VCB) is outdoor high-voltage electrical appliance equipment with three-phase AC 50Hz and rated voltage of 40.5kV. This circuit breaker is attached to install spring operation mechanism or electromagnetism operation mechanism. It can far control electrically operated opening and closing operations, also can manually store energy, manually opening and closing ..The design conforms to the national standards of GB 1984 "AC High Voltage Circuit Breaker" and IEC standards of IEC-65 "High Voltage AC Circuit Breaker".