Allen-Bradley 440R-N23132 Guardmaster MSR127TP Safety Relay, 24V AC/DC, 3NO 1NC
Allen-Bradley 440R-N23132 is a Guardmaster single-function safety relay (type MSR127TP) that monitors guarded machines from a 24V AC/DC control supply and provides three normally open safety contacts plus one normally closed auxiliary contact.
Overview
The relay accepts input from one normally closed guard door switch, two normally closed contacts or a light curtain, with automatic or manual reset selected on the front of the housing. Rockwell lists the 22.5 mm wide housing for 35 mm DIN rail mounting with removable screw terminals and an IP40 enclosure rating. Safety contacts are rated for AC-15 duty at 250V and DC-13 duty at 24V, and the unit is compatible with emergency-stop buttons, interlock switches and optoelectronic protective equipment used in safety interlocking systems.
Key Features
- Single-function safety relay, type MSR127TP (Guardmaster family)
- 24V AC/DC rated control supply, 50/60 Hz
- 3 normally open (N.O.) safety contacts + 1 N.C. auxiliary contact
- Automatic or manual reset, selectable on the housing
- Input contact: 1 N.C., 2 N.C. or light curtain
- Contact rating AC-15: 250V 5 A / DC-13: 24V 3 A
- 22.5 mm wide removable screw terminals; IP40; 35 mm DIN rail mount
Technical Specifications
| Attribute | Value |
|---|---|
| Manufacturer | Allen Bradley (Rockwell Automation) |
| Product Line | Guardmaster Safety Relays (440R) |
| Part Number / Catalog No. | 440R-N23132 |
| UPC | 611320806496 |
| Product Type | Single-Function Safety Relay (MSR127TP) |
| Rated Supply Voltage | 24 V AC/DC (50/60 Hz) |
| Safety Outputs | 3 N.O. (safety contacts) |
| Auxiliary Outputs | 1 N.C. |
| Reset Type | Automatic / Manual |
| Input Contact | 1 N.C., 2 N.C. or Light Curtain |
| Contact Rating | AC-15: 250V 5 A / DC-13: 24V 3 A |
| Compatible Devices | Emergency stops, light curtains, interlock switches |
| Typical Applications | Safety interlocking systems |
| Enclosure Width | 22.5 mm |
| Terminals | Removable Screw |
| Mounting | 35 mm DIN Rail |
| IP Protection | IP40 |
| Dimensions | 13 x 13 x 4 cm (5.1 x 5.1 x 1.6 in) |
| Weight | 0.56 lbs (0.26 kg) |
| Country of Origin | Multiple (varies by manufacturing location) |
| Estimated Lead Time | 5 days |
| Standard Warranty | 1 year |
| Condition Options | New (Original Packaging) |
Applications
The 440R-N23132 is the standard choice for single-zone machine guarding: interlocked guard doors on conveyors, packaging machines and presses, or light-curtain protected access points, with the three N.O. safety contacts driving contactors while the N.C. auxiliary contact feeds status monitoring.
Why Buy from Us
This product is available new in original factory packaging, fully tested and backed by a standard warranty of 1 year. We ship worldwide with careful protective packaging and fast dispatch. Quantity discounts and repair/exchange options are available on request.
Documents
| Resource | Title | Link |
|---|---|---|
| Publication | 440R-IN079 — MSR127T / MSR127TP / MSR127R / MSR127RP Safety Relays Installation Instructions | 440r-in079_-en-p.pdf |
| Publication | 440R-TD001 — Guardmaster Safety Relays Technical Data | 440r-td001_-en-p.pdf |
Certifications
| Certification | Download |
|---|---|
| Safety | 440r-ct072_-en-e.pdf |
| UKCA DOC | 440r-ct075_-en-e.pdf |
Per the Rockwell Automation product certification listing as of 2026-09-23. Please review the product label to confirm the certifications your specific unit carries.
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