Allen-Bradley | 440R-N23126 | Guardmaster Minotaur

Product Description: Allen-Bradley 440R-N23126, also known as the MSR127T

The Allen-Bradley 440R-N23126, also known as the MSR127T, is a single-function safety relay designed for monitoring safety devices such as emergency stop buttons, safety gates, and light curtains. It features dual-channel input monitoring and provides three normally open (N.O.) safety outputs and one normally closed (N.C.) auxiliary output. The relay supports both automatic and manual reset modes, ensuring flexibility in various safety applications.

Key Features

• Dual-channel input monitoring for enhanced safety
• Three N.O. safety outputs for controlling actuators
• One N.C. auxiliary output for status indication
• Supports both automatic and manual reset modes
• Fixed terminals for secure connections
• Compact 22.5 mm housing suitable for DIN rail mounting
• Complies with EN ISO 13849-1 Performance Level e and SIL 3 standards

Technical Specifications

• Supply Voltage: 24V AC/DC
• Safety Outputs: 3 N.O. contacts
• Auxiliary Output: 1 N.C. contact
• Input Configuration: 1 or 2 N.C. inputs, suitable for light curtains
• Reset Modes: Automatic and manual
• Response Time: <20 ms
• Power Consumption: 2 W
• Mounting: 35 mm DIN rail
• Housing Width: 22.5 mm
• Operating Temperature: -5°C to +55°C (23°F to 131°F)
• Enclosure Rating: IP40 (housing), IP20 (terminals)
• Standards Compliance: EN ISO 13849-1 PLe, SIL 3, CE, cULus, BG

Application Areas

• Emergency stop circuits
• Safety gate monitoring
• Light curtain integration
• Two-hand control systems
• Machinery requiring high-integrity safety functions

Advantages

• Ensures high-level safety compliance with PLe and SIL 3 ratings
• Flexible reset options accommodate various operational requirements
• Compact design conserves panel space
• Quick response time enhances system safety
• Reliable operation in industrial environments