Relay, also known as a relay, is an electronic control device that has a control system (also known as an input circuit) and a controlled system (also known as an output circuit). It is usually used in automatic control circuits. It is actually an "automatic switch" that uses a smaller current to control a larger current. Therefore, it plays a role in automatic regulation, safety protection, and conversion circuits in the circuit. The relay coil is represented by a rectangular symbol in the circuit. If the relay has two coils, draw two parallel rectangular boxes. At the same time, mark the text symbol "J" of the relay inside or next to the rectangular box. There are two ways to represent the contacts of relays: one is to draw them directly on one side of a rectangular box, which is more intuitive
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