What are the functions of relays?

Update:20-02-2021
The Latching Relays is an automatic switching element with isolation function. When the change of the excitation amount in the input loop reaches a specified value, the automatic circuit control device can make the controlled electric quantity in the output loop undergo a predetermined step change. It has an induction mechanism that can respond to a certain amount of external excitation (electrical or non-electric), an actuator that can control the "on" and "off" of the controlled circuit, and can compare, judge and convert the magnitude of the excitation The intermediate comparison agency. Relays are widely used in remote control, telemetry, communication, automatic control, mechatronics and aerospace technology, and play the role of control, protection, regulation and transmission of information.
Relays generally have a sensing mechanism (input part) that can reflect certain input variables (such as current, voltage, power, impedance, frequency, temperature, pressure, speed, light, etc.); there is an inductive mechanism (input part) that can "connect" to the controlled circuit. The actuator (output part) of the "off" control; between the input part and the output part of the relay, there is an intermediate mechanism (drive part) for coupling and isolating the input, functional processing and driving the output part.
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