Allen-Bradley 440R-EM4R2D Safety Relay Module

The Allen-Bradley 440R-EM4R2D Guardmaster Expansion Relay Module provides delayed-output safety control for Guardmaster safety-relay networks. As an Expansion Module with Delayed Outputs (EMD) in the 440R family, the 440R-EM4R2D adds B1/B2 expansion inputs and extra safety outputs to a base configuration, enabling more complex safety circuits without replacing the main controller. It supports an aggregate output current up to 6 A per module, with continuous safety output current rated at 2 A at 24 V DC (DC-13, UL B300). The safety outputs use OSSD signals to monitor connected devices, and timing features reflect the EM/EMD family with off-delay, on-delay, and retriggerable modes for controlled output activation. The module also supports pulse testing and a reset/monitor input with options for automatic or manual reset, enhancing fault detection and reliability in applications such as emergency stop circuits, safety doors, safety mats, and other guarded safety devices. Catalog number 440R-EM4R2D identifies the EMD (Expansion Module with Delayed Outputs) variant of the Guardmaster 440R-EM4R2, designed to extend safety logic and monitoring capabilities within industrial automation systems.