Overview
The Allen-Bradley 440R-C23017 is a Guardmaster safety relay engineered for safety-critical monitoring in industrial machines. Part of the MSR6R/T Minotaur universal safety relay family, this dual-channel device was designed to monitor safety inputs and switch safety outputs when hazardous conditions are detected. Although discontinued by Rockwell Automation as of December 31, 2017, it remains in service across many existing installations and is available through industrial surplus and refurbished channels.
Key Features
- Dual-channel architecture: Provides redundancy for critical safety monitoring with two normally-closed input contacts per channel
- Compact DIN-rail design: Saves control panel space and integrates cleanly into standard racks
- Safety contact outputs: Three normally-open safety outputs plus one normally-closed auxiliary contact for flexible safety logic
- LED diagnostics: Built-in status indicators and auxiliary feedback simplify troubleshooting and commissioning
- Universal compatibility: Rated for both AC and DC 24 V supply, supporting flexible integration across diverse machine types
- Proven industrial reliability: Guardmaster relays are recognized for durability in harsh manufacturing environments
Technical Specifications
- Supply Voltage: 24 V AC/DC
- Input Configuration: 2 Ă— N.C. (normally closed) contacts per channel
- Safety Output Contacts: 3 Ă— N.O. (normally open)
- Auxiliary Output Contacts: 1 Ă— N.C. (normally closed)
- Architecture: Dual-channel safety relay (redundant monitoring)
- Housing Width: 45 mm
- Weight: 0.75 lbs (340 g)
- IP Rating: IP20 / IP40 (suitable for indoor control panels)
- Mounting: DIN-rail mount
- Standards Compliance: ISO 13849 Performance Levels
- Product Family: Guardmaster Minotaur MSR6R/T
- Lifecycle Status: Discontinued (December 31, 2017)
- Engineering Replacement: 440R-S13R2
Typical Applications
The 440R-C23017 excels in industrial environments where machine safety and regulatory compliance are mandatory:
- Emergency stop circuits: Dual-channel E-stop button monitoring with automatic shutdown on activation
- Safety gate interlocks: Door and guard interlock switch monitoring to disable hazardous motion when access gates open
- Safety device monitoring: Light curtains, pressure switches, and sensor feedback for protected machinery zones
- Motor and drive disable logic: Controlled shutdown of AC/DC motors and variable frequency drives
- Machine guarding: Manufacturing equipment, packaging lines, presses, and industrial robots requiring EN/ISO safety certification
Compatibility & Replacements
Note: This product is discontinued by Rockwell Automation. For new applications, Rockwell recommends the 440R-S13R2 as the engineering replacement. However, the 440R-C23017 /B remains available through authorized industrial distributors and surplus suppliers as a drop-in replacement for existing legacy systems.
The 440R-C23017 is compatible with standard 24 V AC/DC control circuits and integrates with emergency stop devices, safety switches, and machine control logic that adhere to ISO 13849 safety standards. No firmware or programming is required—wiring configuration depends on your chosen reset mode and input safety device topology. Consult the product manual and your local safety regulations before installation.
