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br network electrical components are electrical control devices. When the change in the input quantity (excitation quantity) meets specified requirements, they cause a predetermined step change in the controlled quantity in the electrical output circuit. They have an interactive relationship between the control system (also known as the input circuit) and the controlled system (also known as the output circuit). Typically applied in automated control circuits, they essentially function as "automatic switches" that use small currents to control the operation of large currents. Therefore, they play roles in automatic regulation, safety protection, and circuit switching in circuits. A relay is a