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Overview
The Allen-Bradley 440R-EM4R2 is a Guardmaster expansion module designed to extend the I/O capability of safety relay systems in industrial and healthcare environments. This expansion module features single-wire safe input with 1 N.C. solid-state auxiliary output, making it ideal for modular safety architecture. The 440R-EM4R2 operates on 24V DC and mounts directly to standard DIN rail, providing a cost-effective way to add safety logic without requiring a complete relay replacement.
Key Features
- Four normally-open safety outputs for flexible safety circuit configuration
- 24V DC power supply with standard industrial voltage compatibility
- Rail mounting in compact 22mm enclosure for space-efficient panel layouts
- Certifications: CCC, CUL, KC, UL for global compliance
- Configurable logic for monitoring emergency-stop circuits and proximity switches
- Compatible with Guardmaster safety relay ecosystem for distributed control
Technical Specifications
- Coil Voltage: 24V DC
- Output Type: 4 Normally Open (N.O.)
- Auxiliary Output: 1 N.C. Solid State
- Mounting: DIN Rail (35mm)
- Enclosure Size: 22mm width
- Input Configuration: Single-wire safe input (L12)
- Certifications: CCC, CUL, KC, UL
- Reset Type: Manual monitored or automatic/manual configurable
- Weight: 0.48 lb (approximately 218g)
Typical Applications
The 440R-EM4R2 is commonly deployed in:
- Emergency-stop (E-stop) circuit monitoring and expansion
- Proximity switch and sensor safety logic integration
- Guard door interlocking systems requiring additional outputs
- Modular safety relay panels in manufacturing and machinery control
- Healthcare equipment safety monitoring (sterilizers, surgical lights, automated systems)
- Multi-zone safety circuit expansion without full controller replacement
Compatibility & Replacements
Compatible With
- Guardmaster 440R series safety relay controllers
- DIN rail mounting systems (35mm standard)
- 24V DC industrial control power supplies
- Emergency-stop and safety interlock circuits requiring discrete outputs
- Proximity switches and limit switch monitoring applications
Replaces / Drop-In Replacement For
Verify compatibility with your system integrator before ordering. The 440R-EM4R2 is a dedicated expansion module designed to work alongside primary safety relays rather than replace a complete relay unit. Common upgrade paths involve adding EM4R2 modules to existing 440R monitoring relays.
Works With
- Guardmaster 440R safety relay line (DI, SI, CI series)
- GuardLink-enabled smart safety devices for status visibility
- Rockwell Automation CompactLogix and ControlLogix platforms for integrated safety systems
- EtherNet/IP and traditional hardwired safety circuit networks
- Manual and automatic reset logic configurations for flexible fault handling
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