The main function of relay is to expand the control range of circuit, control high-power circuit and realize automatic operation state. Its working principle is that when the input reaches the fixed value, the working state can be changed to protect the circuit.
For those unfamiliar with the circuit, they may not know what the relay is. It is a device often used as a switch in the circuit. It connects or disconnects the power circuit through electromagnetic force and unique reed elasticity, so as to control the operation or shutdown of the equipment.
The main function of the relay is to expand the control range of the circuit, that is, when the relay control signal reaches the fixed value, it can connect the multi-channel circuit through different forms of contacts. At the same time, it can also control the high-power circuit, the control circuit composed with other electrical appliances, and realize automatic operation.
The working principle is that when the input reaches the set value, the working state of the control circuit can be changed to form a control or protection effect on the electrical appliance, and at this time, it can also transmit signals.