1)No.1 Vacuum circuit breaker factory 2)Export to Ethiopia,Thailand,Burma,Mongolia,HK,Kenya 3)23 years' ... type Side installation indoor high voltage vacuum circuit breaker is Indoor high voltage switchgear, Applies to rated voltage 12kv, frequency 50Hz three-phase ... switchboard for the fixed, the circuit breaker can be used alone, but also for the ring network power supply, box-type variable, or ...