The permanent magnet AC contactor does not work, moving and static contact is released, such as to attract the coils, magnetic poles will generate a magnetic field, the contactor from a release position to the operating position to move fast, but also to store energy for moving contact release. Once the contact between the electric arc occurs, electromagnetic gap becomes smaller, then the magnetic force will increase, pull speed (pick-up time less than 20ms), thereby greatly reducing the erosion of contact together, keep the contact pressure constant torque permanent magnetic force to make the contact when the net effect of voltage fluctuation, even in critical voltage close contact is not a one-time action, contact chatter. Contactor when the current cut-off current control module will attract coil, the coil does not work, no power consumption, the coil current is zero, no energy consumption, the coil of course not fever, not burned, at this time will depend entirely on the permanent magnetic contact in the operating state. At the same time, the intelligent control of electronic circuit voltage detection module begins to work, when the control voltage detection module detects the voltage is lower than the prescribed value, pull the electric energy stored to the coil with reverse current, the dynamic and static magnetic pole between polar magnetic field repulsion force, and the interaction of the release spring the permanent magnet AC contactor release, the release of energy is the traditional electromagnetic contactor several times, the release speed of electromagnetic contactor is 3~5 times (less than 18ms), effectively reduce the contact between the arc burning time release. When the control voltage is higher than the specified voltage value, even if the voltage fluctuation does not affect the retaining force between the movable and the static contact, the contact can not tremble, thereby completely avoiding the phenomenon that the contact is burned down.