NEWS

A contactor is an automatic switch that connects or disconnects a load-carrying AC/DC main circuit or a large-capacity control circuit. The main control object is a motor. It is also used for other electric loads, such as electric heaters and welding machines, lighting equipment. Contactors can not only turn on and off the circuit, but also have a low-voltage release protection. Contactors control larger load circuits. Suitable for frequency-cum-operation and remote control. It is one of the important components in automatic control system. Specifications many from 10A to 250A specifications have it is not necessary to use it to control the larger load current equipment, it depends on the equipment required automatic control and the equipment’s own capacity.

The contacts which are connected with the traction magnet in the contactor and which can move up and down are called moving contacts, also called bridge contacts, and the contacts which are still are called static contacts. Their operation is to cut off and connect the circuit, the function of the auxiliary contacts is to interlock with the auxiliary contacts according to the degree of automatic control of the contacts. And self-controlled contactor start, and stop. Contactors are used to frequently turn on and off AC and DC main circuits and large capacity control circuits.And the remote control can be realized.
Contactors are divided into DC contactors and AC contactors.The structure of AC contactor mainly has electromagnetic mechanism. Contact system. Extinguish Hong device, etc. . Commonly used is CI1C, C112, C112B series. Contactors are used as power interrupters and control circuits. It uses the main contact to open and close the circuit, and uses the auxiliary contact to execute the control instruction. The main contact usually only has the normally open contact, and the auxiliary contact often has two pairs of normally open and normally closed contacts, the small contact quantity also often uses as the intermediate relay to cooperate with the main circuit.

The working principle of the AC contactor: When The Coil is electrified, the static iron core produces electromagnetic attraction, which pulls the moving iron core together, the contact is closed, thus connecting the power supply. When the power supply of the coil is cut off, the power supply disappears, and the moving Tetsu linkage part is separated by the reaction of the spring, thus disconnecting the main contact and cutting off the power supply.