Allen-Bradley 440N-Z21W1PH Guardmaster Magnetically Coded Switch Micro NSFS

Allen-Bradley Guardmaster 440N-Z21W1PH is a magnetically coded, non-contact interlock switch (MC2) designed to protect personnel by verifying guard door closure on hazardous machinery. The device uses magnetic coding to sense a fixed actuator on the guard with two normally closed solid-state relay safety outputs and a single auxiliary PNP output (0.2 A max), complemented by a status LED for at-a-glance diagnostics. It ships with a 6-inch pigtail terminated in an 8-pin Micro (M12) connector and features a plastic housing with a standard actuator, intended for mounting the sensor to the fixed portion of the guard and the actuator to the moving door. Typical operation is specified for 24 V DC systems, aligning with common industrial safety circuits, and the 440N family is widely used to enforce safe access to machinery by requiring both door and guard to be in the proper position before machine control is enabled. This model, 440N-Z21W1PH, is listed under the Guardmaster 440N series as a magnetically coded interlock with MC2 configuration, offering robust, non-contact sensing in safety interlock applications without mechanical wear from contact-based switches.