A novel Permanent Magnet Actuator (PMA) for<br>mining vacuum circuit breaker (VCB) is presented in this<br>paper. Which is monostable, has two coils and able to<br>break the VCB when the fault of low-voltage happened.<br>And can detect the voltage variation in main circuit at<br>each instant. When the fault of low-voltage happened, it<br>can automatically break without additional detection and<br>control of apparatus. Moreover, the different states and<br>parameters of breaking and closing courses have been<br>numerical computed and analyzed by adopting ANSOFT<br>software. Based on the simulation results, the prototype is<br>manufactured and assembled in the mining VCB. The<br>feasibility and validity of the proposed PMA have been<br>proved by testing results. ...
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