What are the two major parts of the relay?

Relay consists of two parts: coil and contact group.

It has the interactive relationship between the control system (also called input loop) and the controlled system (also called output loop). Usually used in automatic control circuits, it is actually an "automatic switch" that uses small current to control large current. Therefore, it plays the role of automatic adjustment, safety protection and conversion circuit in the circuit.

Extended data

1) Sealed relay: A relay that seals the contact and coil in a cover by welding or other methods and is isolated from the surrounding medium, with low leakage rate.

2) Closed relay: A relay that seals (unseals) contacts and coils with a cover to protect them.

3) Open-circuit relay: A relay that does not need a protective cover to protect electric shock and coils.

Electromagnetic relay and reed relay are the most commonly used relays in electronic products.