Allen-Bradley 440R-H23178 Guardmaster MSR220P Safety Relay Input Module
The Allen-Bradley 440R-H23178 (Guardmaster Minotaur MSR220P series) is a high-performance Safety Relay Input Expansion Module designed to expand safety-monitoring capabilities in industrial automation systems. Operating on a 24V DC power supply, this compact 17.5mm DIN-rail mounted module features dual-channel inputs optimized for monitoring E-stops, safety gates, and optoelectronic protective equipment (light curtains).
| Specifications | |
| Product Make | ALLEN-BRADLEY |
| Part Number / MPN | Â 440R-H23178 |
| Model Series | Â Guardmaster MSR220P (Minotaur) |
| Product Type | Safety Relay Input Module |
| Supply Voltage | 24V DC |
| Power Consumption | Â Low power dissipation optimized for control cabinets |
| Inputs | Dual-channel (1 N.C. / 1 N.O. or 2 N.C. configuration support) |
| Housing Width | 17.5 mm |
| Mounting Type | Standard 35mm DIN Rail |
| Terminals | Removable / Plug-in screw terminals |
| Condition | NEW |
| Warranty | 1 YEAR |
| Country of Origin | Germany |
| Protection Degree | IP40 (Housing), IP20 (Terminals) |
| Length | 99 mm |
| Width | 17.5 mm |
| Height | 114.5 mm |
| Weight | 95 g |










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