OVERVIEW

Official designation: Allen-Bradley 440R-N23132 (Guardmaster MSR127TP Series, Single Function Safety Relay)

Role/Application: A single function safety relay module providing safety monitoring for E-stop, safety gate, or light curtain applications, achieving up to Category 4/PLe with 3 safety outputs.

KEY SPECS SUMMARY

Power: 24V AC/DC

Interfaces / Ports: Removable screw terminals

Indicators: PWR, CH1, CH2 LEDs (Green)

Operating Temp: -5 to 55 degrees C

Platform / Compatibility: DIN rail mountable (35 mm)

Limit: 3 N/O safety, 1 N/C auxiliary outputs

Lifecycle: Active or mature, varies by model/revision

FREQUENTLY ASKED QUESTIONS

Technical Specifications:

Q: What is the maximum contact rating for the safety outputs when switching a DC load?

A: The maximum contact rating is 6 Amps at 24V DC (DC-13 utilization category).

Wiring & Installation:

Q: What are the three possible input wiring configurations supported by this safety relay module?

A: The inputs can be configured for one normally closed, two normally closed, or two PNP connections from a light curtain.

Troubleshooting & Compatibility:

Q: How is a fault condition on the safety circuit typically cleared after removing the initiating cause?

A: The fault is generally cleared by cycling the safety input or cycling power to the safety relay device.

Replacement & Upgrades:

Q: What is the nominal width of this safety relay module for installation and enclosure space planning?

A: The nominal width of the safety relay enclosure is 22.5 millimeters.