Allen-Bradley 440R-N23132 Safety Relay 24VAC DC

Allen-Bradley 440R-N23132 Guardmaster MSR127TP Safety Relay is a 24 V AC/DC single-function safety relay that serves as the safety-circuit processor for guarding devices in automation systems. It accepts a 24 V AC/DC power supply and provides two OSSD safety outputs to monitor safety devices such as emergency stops and light curtains. The contact block comprises three normally open safety contacts and one normally closed auxiliary contact, enabling versatile wiring for safety signaling and interlocks. It supports automatic or manual reset and features removable terminals for straightforward installation. This 440R variant is designed for Cat 4 safety performance (EN ISO 13849-1) and is part of Allen-Bradley’s Guardmaster MSR127TP family, a common choice for machine safety in manufacturing environments. Typical applications include monitoring and interlocking safety circuits in guard doors, safety gates, and safety interlocks, where reliable safe-state signaling feeds into safety controllers and drives.