An electromagnetic relay is an electronic control device with a control system (also known as the input circuit) and a controlled system (also known as the output circuit) and it is usually used in automatic control circuits. It is essentially an "automatic switch" that uses a smaller current and lower voltage to control a larger current and higher voltage., it plays a role in automatic regulation, safety protection, and circuit conversion in the circuit.
The electromagnetic relay is composed of an electromagnet, armature, spring plate, and contacts. Its working circuit consists of two parts: a low-voltage control and a high-voltage working circuit. The electromagnetic relay can also achieve remote control and automatic control.
