Overview
The Allen-Bradley 440R-C23139 MSR131RTP GuardMaster safety relay is a single-function monitoring relay engineered for critical safety applications in industrial machinery and process control. This relay operates at 24 Volt AC/DC with 3 Normally Closed inputs for light curtains and safety mats, 3 Normally Open safety outputs, and 2 Normally Closed auxiliary outputs. It serves as a versatile monitoring solution for high-risk industrial safety circuits, managing inputs from light curtains, safety mats, and E-stop pushbuttons to ensure safe machine operation.
Key Features
- Configurable for four different input wiring arrangements: one normally closed, two normally closed, PNP connections from a light curtain, or four-wire safety mat connections
- When connected in two normally closed fashion, performs cross-fault detection across inputs
- Compact 45mm housing with triple-redundant safety outputs for immediate power disconnection upon fault detection or safety breach
- Removable screw terminals for secure and accessible wiring
- Meets international safety standards: BG, C-Tick, CE, and CULus certifications
Technical Specifications
- Supply Voltage: 24V AC/DC
- Number of Channels: 2
- Safety Outputs: 3 Normally Open
- Auxiliary Outputs: 2 Normally Closed
- Inputs: 3 Normally Closed
- Contact Rating: 2.5 Amps per channel
- Enclosure: 45mm (compact rail-mount)
- Terminal Type: Removable Screw Terminals
- SIL Rating (IEC 61508): SIL 3
- Performance Level (ISO 13849-1): PL e
- Safety Category (ISO 13849-1): Category 4
- Reset Method: Automatic, Manual, or Monitored
- Applicable Functions: Light Beam/Curtain, Safety Mat/Edge
- Weight: 0.75 lb
- UPC: 611320826340
Typical Applications
- Emergency-stop circuit monitoring and safety interlocking
- Light curtain integration for presence detection and personnel protection
- Safety mat and pressure-sensitive edge monitoring
- Single-zone machine guarding and access control
- Industrial press, robotic cell, and conveyor line safety circuits
- Guard gate and protective enclosure interlock logic
Compatibility & Replacements
Compatible With
- Light curtain systems (PNP and NPN sensor outputs)
- Pressure-sensitive safety mats and edges
- Emergency-stop pushbutton stations and circuits
- DIN-rail mounted industrial control systems
- 24V AC/DC power supplies and control voltage systems
Replaces / Drop-In Replacement For
- Earlier versions of the GuardMaster MSR131RTP safety relay
- Direct replacement within the 440R-C series family
- Verify compatibility with your system integrator before ordering
Works With
- Allen-Bradley control systems and safety logic platforms
- Standard 24V AC/DC industrial automation networks
- Hardwired safety circuits and traditional relay-based logic
- ISO 13849-1 certified safety-rated systems
