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secatec electrical components are electrical control devices. When the change in the input quantity (excitation) meets specified requirements, they cause a predetermined step change in the controlled quantity in the electrical output circuit. They facilitate interaction 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 function as "automatic switches" that use small currents to control large currents. Therefore, they perform roles such as automatic regulation, safety protection, and circuit switching in electrical circuits. A relay is an electrically controlled device.