ZN63A-12 indoor AC HV vacuum circuit breaker is a type of holistic and completely sealed HV switchgear, it has compactable dimension and small volume. The VCB applies to power system of rated voltage 12kV, three-phase and AC 50HZ. It conforms to IEC 62271, GB 1984, JB3855 and DL1403 and passes KEMA test. Specifications: 1) Rated voltage: 12kV 2) Rated current: 1,250, 1,600, 2,000, 2,500, 3,150A 3) Rated short circuit breaking current: 31.5, 40, 50kA 4) Mechanical life: 10,000 times