What is the function of electromagnetic relay module

Electromagnetic relay is generally composed of iron core, coil, armature, contact reed and so on. As long as a certain voltage is applied to both ends of the coil of the relay module, a certain current will flow in the coil, which will produce an electromagnetic effect. Under the action of electromagnetic force, the armature will overcome the pulling force of the return spring and attract to the iron core. The moving contact and the static contact (normally open contact) magnetic latching relay that drive the armature are attracted. When the coil is de-energized, the electromagnetic attraction will disappear, and the armature will return to its original position under the reaction force of the spring, releasing the moving contact and the original static contact (normally closed contact). This pulls in and releases, so as to achieve the purpose of conducting and cutting off in the circuit. The "normally open and normally closed" contacts of the relay can be distinguished as follows: the static contact that is in the off state when the relay coil is not energized is called "normally open contact"; the static contact that is in the on state is called It is "normally closed contact". Relays generally have two circuits, a low-voltage control circuit and a high-voltage working circuit.

enlarge:

For example, sensitive relays, intermediate relays, etc., with a very small control quantity, can control a circuit with a large power.

Comprehensive signal:

For example, when a plurality of control signals are input into a multi-winding relay in a prescribed form, they will be compared and integrated to achieve a predetermined control effect.

Automatic, remote control, monitoring:

For example, the relay on the automatic device and other electrical appliances can form a program control circuit to realize automatic operation.