Allen-Bradley 440R-D22S2 Guardmaster Dual Input SS Output Safety Relay

The Allen-Bradley Guardmaster 440R-D22S2 is a Dual Input Solid-State Output Safety Relay (DIS) designed to monitor two independent safety channels and provide two solid-state safety outputs for safe-stop control in automated equipment. It includes two dual-channel universal inputs (DI) that accept a range of 24 VDC safety devices and integrates with Guardmaster safety circuits to verify safe conditions before energizing the OS outputs. The unit also provides a normally closed auxiliary contact, enabling basic interlock or status signaling alongside the dual OSSD outputs. Designed for panel-mounted safety circuits in manufacturing environments, the 440R-D22S2 offers monitored, fail-safe signaling to PLCs and safety controllers while supporting straightforward wiring of two separate safety channels.