The relay (CB1F-D-WM-24V ) is an electrical control device. When the change of the input quantity (excitation quantity) reaches the specified requirements, the controlled quantity will undergo a predetermined step change in the electrical output circuit. Appliances. It has an interactive relationship between the control system (also known as the input loop) and the controlled system (also known as the output loop). Usually used in automated control circuits, it is actually an "automatic switch" that uses small currents to control high current operations. Therefore, it plays the role of automatic adjustment, safety protection, and conversion circuit in the circuit.