Allen-Bradley 440R-C23139 Guardmaster Safety Relay

The Allen-Bradley 440R-C23139 Guardmaster MSR131RTP Safety Relay is a 24 V AC/DC monitoring relay from the Guardmaster Minotaur family that aggregates three normally closed safety inputs and drives three normally open safety outputs, with two additional normally closed auxiliary outputs for signaling and interlocks. Powered from 24 V AC/DC and designed to mount in standard control panels, it features removable screw terminals for straightforward wiring and service. As a single-function safety relay, it conditions signals from protective devices such as light curtains, safety mats, and interlocks, providing a fail-safe path to stop machinery when safety devices are triggered. The MSR131RTP variant consolidates protection logic in a compact module used in Rockwell Automation safety circuits and is compatible with Guardmaster safety networks as part of the 440R family. It supports automatic and manual reset configurations to fit different safeguarding architectures and offers clear indication of safe/stop states through its controlled outputs. Common applications include safeguarding robotic cells, presses, conveyors, and other automated machinery where reliable monitoring of protective devices is required. For installation, consult the official MSR131RTP documentation for wiring diagrams, reset behavior, and compatibility with adjacent 440R modules to ensure proper integration into a compliant safety system.