... operation in power systems of 3-phase. ZN73-12 AC high-voaltage indoor vacuum circuit breaker is applicable to making and breaking load of ... single back-to-back capacitor bank currentA630/4006Rated short-circuit breaking currentkA20, 25, 31.5, 407Rated short time ... 31.5, 408Rated peak withstand currentkA63, 80, 1009Rated short-circuit making current (peak)kA63, 80, 10010Rated making capacitor bank ...