Allen-Bradley 440N-Z21SS2H Actuator And Sensor

Allen-Bradley 440N-Z21SS2H SensaGuard is a non-contact RFID safety switch that pairs a rectangular plastic sensor with a rectangular actuator for guarding machine access points. It belongs to the SensaGuard 440N-Z21 family and provides two safety outputs (OSSDs) plus one auxiliary output, operating from a +24 V DC supply with a diagnostic LED to indicate door status and fault conditions. The sensing head features an 18 mm plastic barrel and an 18 mm rectangular actuator coded S2 (standard code), enabling reliable presence sensing without mechanical contact. Connection options include an integral M12 8-pin quick-connect (H-code) and detachable cables in common lengths such as 3, 10, and 20 meters, offering flexible mounting and wiring. Typical applications include guarding conveyors, presses and other automated equipment where non-contact interlock sensing and dual safety channels are required to meet safety standards, with the third output available for monitoring or signaling.