Note that the voltage of the workpiece in the circuit must not exceed the rated working voltage of the relay, otherwise the relay coil is easy to burn out.

Use the electrical barrier of the multimeter to measure the resistance of the normally closed contact and the moving point, and the resistance should be 0;

Structure: The main components of the electromagnetic relay are electromagnet A, armature B, spring C, moving contact D, and static contact E. (as shown in the figure)

Electromagnetic relay: An electrical relay that works by using the suction effect generated between the electromagnet core and the armature by the point in the input circuit.​​