ZWM9-12/630 permanent magnet outdoor high-voltage vacuum column dry-type circuit breaker (hereinafter referred to as the circuit breaker) is a control and protection equipment in the rated voltage 12KV, 50HZ AC three-phase high-voltage distribution network. Mainly used for breaking and closing load current, overload current, and short-circuit current in power lines. Suitable for protection and control in power distribution systems of substations and industrial and mining enterprises. This circuit breaker adopts a column type, dry-type structure, with reliable insulation, long electrical life, and maintenance free, especially suitable for the requirements of frequent operating places. It is more suitable for installation and use in rural power grids with weak maintenance and repair capabilities. Complies with the requirements of GB1984 AC High Voltage Circuit Breakers, GB1985 AC High Voltage Disconnectors and Grounding Switches, DL/T402, DL/T4.3, and enterprise standard OHX.520.701.