Relay is an electrical control device, its main function is to control the operation of large current through small current, and play the role of automatic adjustment, safety protection and conversion circuit. Relays are usually composed of a control system (input loop) and a controlled system (output loop), with an interactive relationship between the two. In the circuit, the relay acts as an “automatic switch”, which can cause a predetermined step change in the controlled quantity when the change of the input quantity reaches the specified requirements

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