When an electric current is applied to the coil, a magnetic field is created around the coil. Has the power to suck up the iron armature (Armature), which the iron core is connected to one end of the contact (Moving Contact) and the other end is placed on the spring. Which will push the armature steel core to the contact When the coil produces a magnetic field and is more powerful than the spring pressure. The armature core is sucked up. make contact and when cutting off the current that is fed into the coil The magnetism around the coil will be exhausted. The spring pressure pushes the armature steel core away from the contact.

The contacts of a magnetic contactor may be single-pole, two-pole or three-pole, and the contacts may be of normal type or may have both normally open and closed contacts alternately. depending on the model and control circuit