... , 12kV rated voltage GeneralZN63A-12 (VS1) indoor high voltage vacuum circuit breaker is an indoor equipment of three phase AC 50Hz ... , 1600,2000, 2500,31504000,50007Rated short-circuit breaking currentkA20/2531.54040/508Rated short-circuit making currentkA50/63801001209Rated short-circuit durations410Breaking times at rated short-circuit breaking currenttime5050302011Mechanical lifetime20000