Overview
The Allen-Bradley 440R-EM4R2 is a Guardmaster safety relay expansion module engineered for machine safety and industrial monitoring applications. This compact rail-mounted module extends the functionality of existing Guardmaster safety relay systems by providing configurable logic, reset, and timing options. The 440R-EM4R2 operates on 24V DC PELV/SELV power and is designed for monitoring emergency-stop circuits, guard door interlocks, and proximity switch inputs in safety-critical environments.
Key Features
- Four normally open safety outputs with delayed activation capability
- Single-wire safe input for integration with GuardLink-enabled smart safety devices
- One solid-state auxiliary NC output for secondary control logic
- Simple configurable logic for sequenced shutdowns and timing functions
- Compact 22mm DIN rail form factor (119.14 mm × 22.5 mm × 113.6 mm)
- IP20 terminal protection suitable for industrial environments
Technical Specifications
The module features robust electrical and environmental ratings. Power consumption is 3.5W with a power-on delay of 5.5 seconds. Operating temperature range extends from −5°C to +55°C with tolerance for 90% relative humidity. The IP20 protection rating indicates suitability for clean, indoor industrial installations without exposure to water jets or heavy dust.
Typical Applications
- Emergency-stop circuit monitoring and logic expansion
- Guard door interlock and safety gate control
- Proximity switch and safety sensor monitoring
- Sequenced shutdown and delayed actuator release systems
- Machine guarding and personnel protection systems
- Integration with Guardmaster and GuardLink safety networks
Compatibility & Replacements
The 440R-EM4R2 is certified to ISO 13849-1 PLe, Category 3 and carries full UL, CUL, CCC, and KC certifications for global deployment. It is compatible with all Guardmaster base units and supports Dual GuardLink technology for system visibility down to individual guard doors and e-stops. The module requires a compatible Guardmaster safety relay base unit for operation and integrates seamlessly with existing Rockwell Automation control architectures. For applications requiring different output counts or input configurations, alternative Guardmaster modules in the 440R series (such as DI, DIS, SI, CI, GLP, or EMD variants) may be evaluated.
