The Allen-Bradley 440R-N23114 MSR126.1T is a dual-channel safety monitoring relay from the Guardmaster series. It is designed to provide reliable safety control for industrial applications, including the monitoring of emergency stop buttons, safety gates, and light curtains. This unit features dual-channel input capability with integrated cross-fault detection to ensure high levels of safety integrity.
Features
Category 4 per EN 954-1 and SIL 3 per IEC 61508 compliance
Stop category 0
2 Normally Open (N.O.) safety outputs
2 Normally Closed (N.C.) auxiliary outputs
Dual-channel operation with cross-fault monitoring
Configurable automatic or manual reset
Compact 22.5 mm enclosure design
Applications
Automotive & Tire Manufacturing: Monitoring E-stops and light curtains on robotic welding cells and presses.
Food & Beverage Facilities: Safety monitoring for high-speed packaging, bottling, and protein lines.
Life Sciences & Pharmaceuticals: Safety interlocking for serialization and packaging machinery.
Metal & Mining Operations: Protection for safety gates and E-stops on lathes, conveyors, and mineral processors.
Warehouse & Fulfillment Centers: Personnel protection for sorters and palletizers.
Technical Specifications
Model
440R-N23114 MSR126.1T
Power Supply
24V AC/DC
Inputs
Dual Channel
Safety Outputs
2 N.O.
Auxiliary Outputs
2 N.C.
Max Thermal Current (Ie)
1 x 6A, 2 x 4A
Min Switched Current/Voltage
10mA / 10V
Contact Rating
DC-13 6A / 24V DC, 0.1Hz
Reset Type
Automatic / Manual
Enclosure Width
22.5 mm
Terminals
Fixed
Installation Guidelines
Ensure the power supply is disconnected before performing any wiring or installation.
Mount the relay on a standard DIN rail within a suitable industrial enclosure.
For dual-channel applications, ensure correct wiring to S11-S12 and S21-S22 to enable cross-fault detection.
Maintain proper clearance around the unit to ensure adequate ventilation and cooling.
Use shielded cables for safety input signals to minimize interference in high-EMI environments.
Verify that the feedback loop is correctly wired if using manual reset mode.
FAQs
What is the 440R-N23114?
The Allen-Bradley Guardmaster MSR126.1T (Cat. No. 440R-N23114) is a 24V AC/DC, dual-channel safety relay designed for monitoring safety gate interlocks, E-stops, and light curtains.
Does the 440R-N23114 support cross-fault monitoring?
Yes. When used in a 4-wire connection (S11-S12, S21-S22) for dual-channel safety inputs, the MSR126.1T performs cross-fault detection across the inputs.
What is the required input wiring for 2-channel?
The 440R-N23114 is designed to monitor two normally closed (N.C.) inputs, typically connected to terminals S11-S12 and S21-S22.
