brief introduction： Relay accessories are: base, power supply, relay reed, solid state relay shell, relay expansion board. Relay (English name: Relay) is an electrical control device, which makes the controlled quantity in the electrical output circuit predetermined step change when the change of input quantity (excitation quantity) reaches the specified requirement. It has the interaction between the control system (also called the input loop) and the controlled system (also called the output loop). Usually used i

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