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.