Allen‑Bradley – 440R‑P226AGS‑NNR (MSR42) – GuardMaster Multi‑Function

Main Features

• Manufacturer: Allen‑Bradley / Rockwell Automation GuardMaster MSR42 series  

• MPN: 440R‑P226AGS‑NNR; commonly referred to as MSR42 Start or GuardShield safety relay  

• Inputs: Up to 4 safety inputs (suitable for safety light curtains, E-stops, safety doors); supports manual or automatic/manual monitored reset modes  

• Outputs:

  • 2 PNP safety outputs (OSSD) rated at 400 mA each for direct connection to safety contactors  

  • 2 auxiliary configurable outputs for diagnostics or signaling

• Voltage & Power Specs: 24 V DC power supply; module draws approx. 2.4 W  

• Safety Ratings:

  • EN ISO 13849‑1 Category 4

  • SIL 3 (IEC 61508)

  • IEC 61496‑1 light curtain compatible  

• Diagnostics & Indicators: Features 13 front-panel LEDs; ribbon interface enables automatic muting, blanking, and external device monitoring (EDM/start-release functionality)  

• Form Factor: DIN‑rail mountable, 22.5 mm width, approx. 110 × 22.5 × 110 mm, weighing around 0.16 kg  

• Connection Details: Removable terminal blocks; built-in RJ45 port for interfacing with GuardShield Micro‑400 safety light curtains