ZW6-12/630-16(20) Outdoor Vacuum circuit breaker ZW6-21/630-1620type outdoor vacuum circuit breaker accounts for three-phase electrical system with 12 KV and 50Hz, ... ,16,206Rated short circuit closing curent (peak)31.5,40,507Rated short circuit closing current 31.5,40,508Rated short-times ... of rated short-circuit 4S12.5,16 ...