Attività

What is the working principle of AC contactor?

The AC contactor is an electromagnetic AC contactor with a NO main contact, three poles, and air as the arc extinguishing medium. Its components include: coil, short-circuit ring, static iron core, moving iron core, moving contact, static contact, auxiliary NO contact, auxiliary NC contact, pressure spring sheet, reaction spring, buffer spring, arc extinguishing The cover is composed of original parts. The appearance structure of the common AC contactor is shown in the figure below:

Electromagnetic system: It includes coil, static iron core and moving iron core (also called armature).

Contact system: It includes main contacts and auxiliary contacts. The main contact allows a larger current to pass through and plays the role of connecting and cutting off the main circuit. Usually, the maximum current allowed by the main contact (ie, the rated current) is one of the technical parameters of the contactor. Auxiliary contacts are only allowed to pass small currents, and are generally connected to the control circuit when used.

The main contacts of AC contactors are generally NO contacts, and the auxiliary contacts are either NO or NC. A contactor with a smaller rated current has four auxiliary contacts; a contactor with a larger rated current has six auxiliary contacts.