MSR127TP Safety Relay
The 440R-N23131 is a Guardmaster MSR127TP single-function safety relay designed for safety monitoring applications using mechanical contacts or compatible OSSD devices.
Allen-Bradley 440R-N23131 Safety Relay 115V AC 3NO 1NC
Available in stock (400)
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$195.03
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Technical Specifications
| Brand | Allen-Bradley |
| Model Number | 440R-N23131 |
| Product Category | Safety Relay |
| Sub Brand | Guardmaster |
| Relay Model | MSR127TP |
| Safety Inputs | 1 N.C., 2 N.C., or OSSD |
| Immediate Safety Outputs | 3 N.O. |
| Immediate Auxiliary Outputs | 1 N.C. |
| Power Supply | 115 V AC, 50/60 Hz |
| Power Consumption | 2 W |
| Reset | Automatic/Manual |
| Response Time | 15 ms |
| Power-On Delay | 1 s |
| Recovery Time | 100 ms |
| Input Resistance | 110 Ω Maximum |
| Safety Classification | Category 4, PLe per ISO 13849-1 |
| SIL | SIL 3 per IEC 61508 and IEC 62061 |
| Stop Category | 0 |
| Rated Impulse Withstand Voltage | 2500 V |
| Minimum Switching Current/Voltage | 10 mA at 10 V |
| Terminal Type | Removable Screw Terminals |
| Enclosure Protection | IP40 (NEMA 1) |
| Terminal Protection | IP20 |
| Mounting | 35 mm DIN Rail |
| Weight | 260 g (0.57 lb) |
| Conductor Size | 0.2–4 mm² (24–12 AWG) |
| Dimensions | 114.5 × 22.5 × 99 mm |
Key Features
3NO Safety Outputs
Three normally open safety-rated outputs use independent and redundant internal contacts to support the safety function.
1NC Auxiliary Output
One normally closed auxiliary output provides an external status signal associated with the state of the safety outputs.
115V AC Supply
This catalog number is the 115 V AC, 50/60 Hz version of the MSR127TP family and has a documented power consumption of 2 W.
Flexible Safety Inputs
The relay supports one N.C., two N.C., or OSSD input configurations for compatible safety devices, with cross-fault monitoring for the two N.C. configuration.
Removable Screw Terminals
The 440R-N23131 uses removable screw terminals and mounts on standard 35 mm DIN rail for industrial control-panel installation.
Applications
- Emergency-stop circuit monitoring
- Safety gate monitoring
- Light curtain monitoring
- OSSD safety device monitoring
- Dual-channel safety circuits
- Machine safety control panels
- Industrial equipment safeguarding
- Safety-related shutdown circuits
Purchase Information
We support online purchase of the Allen-Bradley 440R-N23131 Safety Relay. If you need to make bulk purchases and inquire about other products, please contact our team to inform us of your purchase requirements. We will provide you with information such as quantity quotations, delivery dates, and transportation methods.
Frequently Asked Questions
What is Allen-Bradley 440R-N23131?
The 440R-N23131 is a Guardmaster MSR127TP single-function safety relay with 115 V AC supply, three normally open safety outputs and one normally closed auxiliary output.
What power supply does 440R-N23131 use?
This catalog number uses a 115 V AC, 50/60 Hz power supply.
How many safety outputs does 440R-N23131 provide?
The relay provides three normally open safety-rated outputs.
Does 440R-N23131 have an auxiliary output?
Yes. It provides one normally closed auxiliary output for external status signalling.
What input configurations does 440R-N23131 support?
The MSR127TP supports one normally closed input, two normally closed inputs, or OSSD inputs from compatible safety devices.
What reset type does 440R-N23131 use?
The 440R-N23131 is the automatic/manual reset version of the MSR127TP safety relay.
What is the response time of 440R-N23131?
The documented response time is 15 ms.
What safety classification does the MSR127TP support?
The MSR127RP/TP family is specified up to Category 4 and PLe according to ISO 13849-1 and SIL 3 according to IEC 61508 and IEC 62061, depending on the system architecture and application.
Can 440R-N23131 monitor an emergency-stop circuit?
Yes. The MSR127TP family is intended for safety monitoring applications including emergency-stop circuits when configured according to the applicable safety requirements.
Can 440R-N23131 be used with an OSSD device?
Yes. OSSD is one of the documented input configurations. The connected OSSD device is responsible for cross-fault detection for its outputs.
What type of terminals does 440R-N23131 use?
The 440R-N23131 uses removable screw terminals and supports conductor sizes up to 0.2 to 4 mm², or 24 to 12 AWG.
What should be checked before ordering 440R-N23131?
Check the complete catalog number, 115 V AC supply requirement, input device and wiring configuration, 3NO safety and 1NC auxiliary output requirements, automatic/manual reset function and the required safety-system architecture.
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