Allen-Bradley 440R-N23132 Guardmaster Safety Relay

The Allen-Bradley Guardmaster 440R-N23132 MSR127TP Safety Relay is a 24 V AC/DC monitored safety relay designed to manage and monitor safety devices in guarding circuits such as emergency stops, safety interlocks, and light curtains. It provides three normally open safety contacts and one normally closed auxiliary contact, with OSSD (Output Safe State Device) monitored outputs to signal a safe state when guards are in a safe condition. The module supports automatic or manual reset and uses removable screw terminals for straightforward field wiring.

• Coil voltage: 24 V AC/DC
• Contacts: 3 normally open (NO), 1 normally closed (NC) auxiliary
• OSSD monitored outputs
• Reset: Automatic or manual
• Terminals: Removable screw terminals
• Ratings: AC-15 up to 5 A at 250 V AC; DC-13 up to 3 A at 24 V DC
• Model family: MSR127TP; part number 440R-N23132
• Typical applications: safety circuits for machine guarding, emergency stop networks, and interlocks requiring monitored safety signaling