The working principle of the contactor is: when the contactor coil is energized, the coil current generates a magnetic field, and the magnetic field generated by the contactor causes the static iron core to generate electromagnetic attraction to attract the moving iron core, and drives the AC contactor to move, and the normally closed contact is disconnected. The normally open contacts are closed and the two are linked. When the coil is de-energized, the electromagnetic attraction disappears and the armature is released under the action of the release spring, the contact is restored, the normally open contact is opened, and the normally closed contact is closed. The working principle of the DC contactor is somewhat similar to the principle of the temperature switch.
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