Allen-Bradley 440G-LZS21UTLH Guard Locking Switch

The Allen-Bradley 440G-LZS21UTLH Guard Locking Switch is a Power-to-Lock Guardmaster interlock in the 440G-LZ family, designed to secure guarded machine doors and ensure proper door status signaling. It operates at 24 V DC and provides three PNP outputs—two safety/auxiliary and one auxiliary—each rated to 0.2 A, enabling integration with safety relays or PLCs. The actuator is RFID-based, delivering a unique, encoded door actuator to help prevent tampering while delivering door-status feedback. The unit ships with a 6-inch (150 mm) pigtail and an M12 8‑pin quick-disconnect connector for easy field wiring. It carries robust environmental protection, commonly documented as IP66/IP67/IP69K-rated, making it suitable for challenging industrial settings and washdown environments. Holding force is specified at about 1,300 N (roughly 292 lbf), providing strong resistance to door opening under load. Typical applications include safeguarding automated production lines, packaging machines, and other equipment where secure access control and reliable door interlock signaling are essential, with compatibility within standard Guardmaster safety circuits for straightforward system integration. This model’s combination of 24 VDC actuation, RFID unique actuator, three PNP contacts, and rugged enclosure position it as a precise, tamper-resistant solution for machinery guarding in demanding manufacturing environments.