air circuit breaker operation

ZW20 50 kA 12kv Outdoor Vacuum Air thermal electronic magnetic power Circuit Breakers Air Circuit Breakers Technical Parameter No Item Unit Data 1 Rated voltage kv 12 2 Rated frequency Hz 50 3 Rated current A 630 4 Rated peak value withstand current kA 50 5 Rated time withstand current/4s kA 20 6 Rated short circuit breaking current kA 20 7 Rated short circuit current making cycles(peak value) times 50 8 Rated operate sequence 　 O-0.3s-CO-180s-O 9 Lightning impulse withstand