Allen-Bradley 440G-T27178 Safety Interlock Switch

The Allen-Bradley 440G-T27178 Guardmaster TLS-GD2 guard-locking safety interlock switch is designed to secure guarded access to hazardous machinery with a Power-to-Lock configuration, ensuring the door remains locked while the safety circuit is energized. This 110 V AC/DC solenoid version provides solenoid contacts: 1 normally closed and 1 normally open, plus safety and auxiliary contacts totaling 2 normally closed and 1 normally open for reliable lock control and door-monitoring circuits. It features a standard actuator, a 1/2 in NPT conduit entry, and is part of the Guardmaster 440G TLS-GD2 family, enabling straightforward integration with common safety relays and control architectures in industrial environments. Used on guard doors in manufacturing, packaging, and similar settings, the 440G-T27178 supports clear door-status signaling and robust locking to meet typical safety standards.