Allen-Bradley 440R-EM4R2 Guardmaster Safety Relay Expansion Module

The Allen-Bradley 440R-EM4R2 Guardmaster Safety Relay Expansion Module provides additional safety relay output channels for Guardmaster safety relays and controllers, enabling expanded safety logic in machine safety systems. It is commonly installed in machine safety panels, automated production systems, and control cabinets to monitor more safety devices such as emergency stops, safety gates, and light curtains. Designed to work with 440R Guardmaster safety relays and controllers, this DIN-rail or panel-mounted expansion module connects to the safety relay base unit to extend outputs, delivering safety-rated relay outputs (model dependent count). It is intended for industrial environments and is installed within a safety control enclosure. Common replacements include the Allen-Bradley 440R-EM4R1 and 440R-EM2R2 expansion modules, and the Omron G9SX Safety Relay Output Expansion Module.