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Product Overview
The Allen-Bradley 440R-N23132 is a high-performance single-function safety relay from the Rockwell Automation Guardmaster MSR127 series, designed to provide reliable machine safety monitoring in industrial automation environments . Also known as the Guardmaster MSR127TP model, the 440R-N23132 serves as a critical safety component that monitors emergency stop circuits, safety light curtains, guard door interlock switches, and other protective devices to ensure operator safety and machine compliance with international safety standards .
The Allen-Bradley 440R-N23132 features a 24V AC/DC power supply and offers versatile input configuration options, supporting one normally closed (1NC), two normally closed (2NC), or two PNP connections from a light curtain . This flexibility, combined with its 15ms response time, makes the 440R-N23132 ideal for applications requiring rapid fault detection and immediate machine shutdown. The safety relay’s redundant dual-channel architecture ensures single-point failures do not compromise the safety function, delivering a safety category of Category 4 per EN 954-1, Performance Level e per ISO 13849-1, and SIL CL3 per IEC 62061 .
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 440R-N23132 |
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Series | Guardmaster MSR127TP |
| Product Type | Single-Function Safety Relay |
| Supply Voltage | 24V AC/DC |
| Safety Outputs | 3 N.O. (Normally Open) Safety Contacts |
| Auxiliary Outputs | 1 N.C. (Normally Closed) Auxiliary Contact |
| Contact Rating (Ie) | 5A at AC-15 230V; 3A at DC-13 24V |
| Thermal Current (Ith) | Up to 5A (non-switching) |
| Response Time | 15 ms (typical) |
| Input Configuration | 1NC, 2NC, or Light Curtain (PNP) |
| Reset Type | Automatic/Manual Reset |
| Stop Category | 0 (IEC 60204) |
| Safety Category | Category 4 (EN 954-1) |
| Performance Level | PL e (ISO 13849-1) |
| SIL Rating | SIL CL3 (IEC 62061) |
| Operating Temperature | -5°C to +55°C |
| Enclosure Rating | IP40 (Housing), IP20 (Terminals) |
| Mounting | 35mm DIN Rail |
| Dimensions (W x H x D) | 22.5 x 99 x 114.5 mm |
| Weight | Approx. 210-222g |
| Terminal Type | Removable Screw Terminals |
| Certifications | CE, cULus, BG, TÜV |
Main Features and Advantages
Versatile Input Configurations and Cross Fault Monitoring: The Allen-Bradley 440R-N23132 supports three distinct input wiring configurations to suit various safety applications. The 440R-N23132 can be connected as a 1NC input, a 2NC input, or with two PNP connections directly from a safety light curtain . When configured in the 2NC mode, the 440R-N23132 actively checks for cross faults between the two input channels, a common failure mode where wiring shorts could bypass the safety function. For light curtain applications, the 440R-N23132 relies on the light curtain’s internal cross fault detection, ensuring compatibility with a wide range of optoelectronic protective devices .
High Safety Performance with Rapid Response: The Allen-Bradley 440R-N23132 delivers a best-in-class safety rating of Category 4, PL e, and SIL CL3, making it suitable for the most demanding safety applications . Its dual-channel, redundant architecture ensures that a single component failure does not result in the loss of the safety function. With a typical response time of just 15ms from input to output, the 440R-N23132 provides rapid machine stop capability, reducing the risk of injury in hazardous situations . The relay features 3 safety outputs (3 N.O.) and 1 auxiliary output (1 N.C.) for status signaling .
Flexible Reset Options and Compact Design: The 440R-N23132 offers both automatic and manual reset functionality, providing flexibility for different operational requirements . In automatic reset mode, the relay resets as soon as the monitored safety circuit returns to a safe state; in manual reset mode, a dedicated reset button must be pressed to re-energize the outputs . The Allen-Bradley 440R-N23132 features a compact 22.5mm wide housing, allowing for high-density mounting on standard 35mm DIN rails, saving valuable space in control cabinets. Removable screw terminals simplify wiring and maintenance, while the IP20 terminal protection ensures operator safety during installation and troubleshooting .
