Major Technical Data: Rated voltage: 12KV Rated frequency: 50HZ Rated current: 630A. 1250A. 1600A. 2000A. 2500A. 3150A. 4000A. 5000A. Rated short circuit current to be turn-off: 20KA. 31. 5KA. 40KA. 63KA. Mechanical lifetime of the operating device: ≥100, 000 times (5000A 63KA Mechanical lifetime: ≥60, 000 times) Mechanical lifetime: (630A-1250A) 20KA ≥50, 000 times. (1250A-3150A) 31. 5KA ≥50, 000 times (1250A-4000A) 40KA ≥30, 000 times (5000A) 63KA ≥30, 000 times Operating voltage for switch-on and switch-off: DC220V or AC220V Introduction: ZN73A-12Permanent Magnetic Medium Voltage Indoor Vacuum Circuit Breaker is one of Permanent Magnetic Products Series developed and manufactured by Jilin Yongda Group itself, and currently it is the permanent magnetic circuit breaker which occupies the largest domestic market. It is extensively applied to large steel makers, such as Baoshan Steel, Shoudu Steel, Anshan Steel, as well as petrochemical sector, electric power sector etc. And gained excellent reputation from the consumers.