In principle, a relay is an automatic switch element with isolation function, which is widely used in relay communication, remote control, telemetry, automatic control, mechatronics, and a very important control element in power electronic equipment.
Relays generally have accessories that can reflect certain input variables (such as impedance, frequency, current, voltage, power, temperature, pressure, speed, light, etc.) sensing structure.
There is an execution structure that can realize on and off control of the controlled circuit; between the input part and the output part of the relay, there is also an intermediate structure part for coupling and isolating the input, functional processing and driving the output part.
