AC contactor is mainly composed of electromagnetic system, contact system, arc extinguishing system and other parts.

①Electromagnetic system: The electromagnetic system includes the electromagnetic coil and the iron core, which is an important part of the contactor, relying on it to drive the closing and opening of the contacts.

②Contact system: The contact is the executive part of the AC contactor, including the main contact and the auxiliary contact. The function of the main contact is to turn on and off the main circuit and control a larger current, while the auxiliary contact is in the control circuit to meet the requirements of various control methods.

③Arc extinguishing system: AC contactor arc extinguishing device is used to ensure that the arc generated is reliably extinguished when the contact is disconnected from the circuit, and the damage of the arc to the contact is reduced.

④Other parts: Other parts of AC contactor include insulating shell, spring, short-circuit ring, transmission mechanism, etc.