Allen-Bradley 440G-T27175 Guard Locking Safety Switch

Allen-Bradley 440G-T27175 is a Guardmaster guard-locking safety interlock in the 440G TLS-GD2 family, built for power-to-lock operation on machine access doors in industrial environments. The 24V AC/DC solenoid and TLS-GD2 configuration drive a standard actuator and a 1/2 in NPT conduit entry, enabling straightforward integration with common safety circuits. On the safety side, the interlock provides two normally closed contacts for the safety circuit plus one normally open auxiliary contact, while the solenoid block carries one normally closed and one normally open contact, supporting reliable monitoring and signaling in safety relays or safety PLCs. The catalog number 440G-T27175 confirms TLS-GD2 with power-to-lock operation (TLS-2) and a 24-volt coil, aligning with Rockwell's Guardmaster specifications. This interlock is designed for tongue-operated guard locking and is compatible with Rockwell automation safety ecosystems. Typical applications include guarding access doors on presses, conveyors, robotics cells, and other automated equipment where locking the door during operation is essential for personnel protection. Conduit entry is 1/2 in NPT, matching common panel-handling configurations and enabling robust field wiring.