AC contactor uses the main points to open and close the circuit, to conduct the control loop with auxiliary contact.

The main contact is normally open contact, and the auxiliary contacts often have two pairs of normally open contact and the normally closed contact, sometimes, small ac contactor is taken as an intermediate relay to be using with the main circuit.

Abstract: the contacts of the AC contactor are made of silver tungsten alloy, with good conductivity and high temperature resistant and ablative resistant.

The work power of ac contactor action comes from a magnetic field produced by iron core, the electromagnet core is composed of two "mountain" shape of the silicon steel sheets in superposition of states, and one of them with coil fixes the iron core. The working voltage can have multiple choices. In order to make the stable magnetic, the attracting surface of core is added short circuit ring. AC contactor in the loss of power can reset by relying on the spring

The other half is a movable iron core, and its structure is the same with the fixed iron core. It mainly is used to close and open of the main contact and auxiliary contacts.

The Contact whose current is more than 20 amps is added arc shield to fast break arc by using the generated electromagnetic force when the circuit is broken to protect the contact.

Contactor can work by high frequency operation, and the highest operating frequency can be up to 1200 times per hour when it used as power supply to open and close the control.

Contactor life is very high, its mechanical life is generally millions of times even to ten million times, and the electrical life is generally hundreds of thousands to millions of times.

-----Yueqing tianhui electric co.,ltd