... three-phase AC 50HZ single bus, high voltage switchgear is with ZN12-40.5 and ZN23-40.5 vacuum circuit breaker ... modular structure makes maintenance easy. The handcart can be equipped with all type of operating mechanism. high voltage switchgear is widely ... -time withstand current (4S)KA20, 25, 31.5Specified short circuit drop-out currentKA20, 25, 31.5Rated withstand current (peak)KA50, 63, 80Rated ...