Allen Bradley 440R-C23139 Guardmaster MSR131RTP Safety Relay

2026-04-27T23:52:44-07:00

Type: Safety Relay
Price: 66.00

Product Overview

The Allen Bradley 440R-C23139, part of the Guardmaster MSR131RTP series, serves as a versatile monitoring solution for high-risk industrial safety circuits. This module manages inputs from light curtains, safety mats, and E-stop pushbuttons to ensure safe machine operation. It features a compact 45mm housing and provides triple-redundant safety outputs to disconnect power immediately upon a fault detection or safety breach. We supply this unit as 100% Brand New and Original, ensuring your facility meets stringent global safety standards with factory-certified hardware.

Technical Specifications

The 440R-C23139 provides robust logic monitoring with the following technical parameters:

Feature | Specification
Manufacturer | Allen Bradley (Rockwell Automation)
Series | Guardmaster MSR131RTP
Supply Voltage | 24V AC/DC
Safety Outputs | 3 N.O. (Normally Open)
Auxiliary Outputs | 2 N.C. / 2 PNP Solid State
Inputs Supported | 1 N.C., 2 N.C., Light Curtains, Safety Mats
Reset Type | Automatic or Manual Monitored
Housing Width | 45 mm
Terminals | Removable Screw Terminals
Weight | 0.70 lbs (0.32 kg)

Engineering Advantages

The 440R-C23139 addresses complex safety integration and maintenance requirements:

Universal Input Compatibility: This relay accepts diverse signal types, including OSSD signals from light curtains and resistive signals from safety mats. This flexibility allows engineers to standardize on a single relay model across multiple machine safety zones.

Streamlined Maintenance: The unit utilizes removable screw terminals. This design allows technicians to replace the module in seconds without re-wiring the entire safety cabinet, significantly reducing downtime during scheduled inspections or hardware upgrades.

Monitored Reset Flexibility: The module supports both automatic and manual monitored reset modes. Manual monitored reset ensures that the machine cannot restart until the operator clears the safety zone and manually toggles the reset button, preventing accidental start-ups.

Auxiliary Feedback Channels: Beyond the primary safety outputs, the unit provides two PNP solid-state auxiliary outputs. These channels feed real-time status data directly to your PLC or HMI, allowing for immediate diagnostic visualization of the safety circuit's state.

FAQs

Can I use this relay with a 24V AC power source?

Yes. The 440R-C23139 features a flexible power stage that accepts both 24V DC and 24V AC (50/60Hz) supply voltages, facilitating installation in varied control environments.

What is the difference between the N.O. and N.C. outputs on this device?

The 3 N.O. (Normally Open) outputs serve as your safety-rated path to cut power to motors or actuators. The 2 N.C. and PNP outputs function as auxiliary signals for status monitoring and should not perform safety-critical switching.

Does this unit support "Category 4" safety applications?

The MSR131RTP series supports high-level safety categories. However, your specific rating depends on the dual-channel wiring and the architecture of your entire safety loop. Always consult your safety risk assessment before final commissioning.

How do I confirm this is a Brand New unit?

We guarantee the 440R-C23139 is 100% Brand New. Every unit arrives in original Rockwell Automation packaging with intact factory seals, matching serial numbers, and a 2026-era manufacturing date code where applicable.