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

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