Allen‑Bradley – 440R‑EM4R2D (Guardmaster EMD) – Safety Relay Expansion Module

Main Features

• Category & Compatibility: Guardmaster series expansion module (EMD type) designed to work with 440R-S/MSR safety relays; requires a Single Wire Safety (SWS) host relay input  

• Delayed Safety Outputs: Equipped with 4 normally‑open (NO) safety-rated relay outputs, configurable for on‑delay, off‑delay, or jogging timing modes via front-panel rotary switches  

• Safety Input/Output:

  • 1 SWS input for receiving safety logic from the master relay

  • 1 SWS output to chain and expand additional Guardmaster modules  

• Power Supply: 24 V DC typical, draws around 3.5 W  

• Construction: Slim DIN-rail mountable module (approx. 22.5 mm wide), IP40 with removable screw terminals; operating range –5 °C to +55 °C  

• Safety Standards:

  • SIL 3 / PLe, Cat 4 compliance per EN ISO 13849‑1 and IEC 61508

  • Certified to IEC 60204‑1, EN ISO 12100, UL, TÜV, CE