12KV Permanent Magnet Embedded Poles Type vacuum circuit breaker is a three - phase AC 50Hz rated voltage 12kV indoor switch equipment of power system . It is used as the protection and control unit of power grid equipment and power cquipment of industrial and mining enterprises . It is suitable for frequent operation under rated operating current or for short circuit current . 

Executive Standard 

GB1984 AC High Voltage circuit breaker

DL/T403 12~40.5KV Indoor AC high voltage circuit breaker ordering technical conditions
IEC60694

IEC6227-100