Latching/interface and switching relays are ideal connecting links between the highly-sensitive and low-power logic circuitry of a PLC, control system or process computer and the raw environment of the power level on a machine such as motor drives, magnetic clutches or hydraulic cylinders. The relays ensure a metallic isolation between logic and power circuitry.

There is a differentiation between bistable devices (latching relay) and monostable devices (cinterface or switching relay). The latter are available as power/industrial relays up to 16 A with pin base and socket for top hat rail mounting or as complete solution for installation in switch cabinets and distribution boards, or as positive-action devices for safety applications.