AC contactor is electric drive and automatic control of a low voltage electrical control system the most commonly used. As the actuator for connecting and disconnecting lines, or frequent operation of equipment such as motor control. From the dynamic and static main contact, arc shield, dynamic and static iron core, composed of auxiliary contacts and bracket shell etc.. After the electromagnetic coil is energized, the movable iron core is pulled in under the action of the electromagnetic force, and the movable contact is contacted with the static contact directly or through the lever drive, and the circuit is connected. After the electromagnetic coil is switched off, the moving iron core is returned automatically under the action of the reset spring, which is commonly called release, and the contacts are separated, and the circuit is broken.