Allen-Bradley 440G-LZS21STLH Safety Guard Locking Switch

The Allen-Bradley Guardmaster 440G-LZS21STLH is a power-to-lock safety guard locking switch with an RFID standard actuator that secures machine access doors and requires a valid release to unlock before the machine can operate. It belongs to the 440G-LZ family and is driven by a 24 V DC solenoid; solenoid contacts are not part of the switch itself, while three signaling outputs provide door and safety status: two PNP safety/auxiliary contacts and one PNP door-status contact, each rated up to 0.2 A. The unit uses a 6-inch (150 mm) conduit entry with an M12 8-pin quick-disconnect plug for straightforward wiring. In safety circuits, this device delivers lock status and door status feedback to the controller, supporting guard-locking configurations where the guard must be closed and locked before equipment start, operation, or maintenance. The RFID actuator adds a layer of security by requiring a coded actuation, making the 440G-LZS21STLH well-suited for demanding manufacturing environments where dependable protection of personnel and equipment is essential.