The working principle of the automotive relay is: the relay is not only a control switch, but also a control object (actuator). When a certain voltage or current is applied to both ends of the electromagnetic relay coil, the magnetic flux generated by the coil passes through the magnetic circuit composed of the iron core, yoke, armature, and magnetic circuit working air gap. Under the action of the magnetic field, the armature is attracted to the pole surface of the iron core. In this way, the normally closed contact of the contact is pushed to open, and the normally open contact is closed; when the voltage or current at both ends of the coil is less than a certain value, when the mechanical reaction force is greater than the electromagnetic suction force, the armature returns to the initial state, and the normally open contact is disconnected. The normally closed contact is closed.
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