Allen Bradley 440R-N23131 Safety Relay – MSR127.1T, 115V AC, 3 N.O. + 1 N.C. Contacts, Automatic/Manual Reset, Removable Terminals

The Allen Bradley 440R-N23131 (MSR127.1T) is a Guardmaster single-function safety relay designed for monitoring emergency stop circuits, magnetic interlocks, and optoelectronic protection devices. Operating at a 115V AC supply, this relay provides three normally open (N.O.) safety contacts and one normally closed (N.C.) auxiliary contact to deliver reliable safety performance across diverse industrial environments.

Supporting both automatic and manual reset modes, the MSR127.1T offers flexibility for varying machine safety requirements. Designed to achieve Performance Level “e” per EN ISO 13849-1 and Category 0 stop functionality as defined by IEC 60204, it ensures maximum protection and controlled operation. The removable plug-in terminals make wiring, testing, and maintenance more efficient, while its compact 22.5mm housing fits seamlessly into tight control panels.

Technical Specifications

Model: 440R-N23131 Allen Bradley
Series: Guardmaster MSR
Product Type: Single-Function Safety Relay
Supply Voltage: 115V AC (50 Hz)
Voltage Type: AC
Input Configuration: 1-channel or 1- and 2-channel
Safety Outputs: 3 N.O. contacts
Auxiliary Output: 1 N.C. contact (signalling function)
Reset Mode: Automatic or Manual selectable
Performance Level (EN ISO 13849-1): Level e
Stop Category (IEC 60204): 0
Mounting Type: DIN Rail (35mm top hat)
Connection Type: Plug-in removable terminals
Dimensions (W x H x D): 99 x 114.5 x 22.5 mm

Electrical & Performance Details

• Supply Voltage Range: 115V AC ±10%
• Output Configuration: 3 N.O. safety outputs + 1 N.C. auxiliary
• Input Type: Single or dual-channel monitoring supported
• Reset Function: Selectable automatic or manual reset
• Stop Function: Category 0 (immediate stop)
• Performance Level: PL e / Category 4
• Feedback Circuit: Yes, for contactor monitoring
• Start Input: Yes (monitored start supported)
• Relay Contacts: Electromechanical type for reliable switching

Mechanical Specifications

• Width: 99 mm
• Height: 114.5 mm
• Depth: 22.5 mm
• Mounting: 35mm DIN Rail
• Connection Type: Plug-in removable terminals
• Housing: Slimline safety relay enclosure suitable for control panels

Environmental & Application Suitability

• Typical Applications: Emergency stop circuits, guard door switches, light curtain safety systems
• Monitoring Capability: Single or dual-channel input configuration
• Stop Function: Category 0 (immediate shutdown)
• Suitable For: E-stop, magnetic interlocks, and optoelectronic sensors
• Installation Environment: Industrial control cabinets and machinery safety systems

Compliance & Certifications

• Performance Level: PL e (EN ISO 13849-1)
• Safety Category: Category 4 (IEC 62061)
• Stop Category: 0 (IEC 60204)
• UL / cUL Listed: Yes
• BG BIA Approved: Yes
• CE Marked: Yes
• RoHS Compliant: Yes

Key Features & Benefits

✅ 3 N.O. safety outputs for secure circuit isolation.

✅ 1 N.C. auxiliary output for reliable system feedback.

✅ Automatic or manual reset modes for flexible control strategies.

✅ Category 0 stop function for immediate power removal.

✅ Performance Level e certified for high-integrity safety applications.

✅ Compact 22.5mm housing saves panel space.

✅ Removable terminals simplify wiring and maintenance.

📦 Order the Allen Bradley 440R-N23131 from Drive Outlet Megastore

At Drive Outlet Megastore we offer unbeatable Allen Bradley 440R-N23131 prices, with fast UK & EU delivery and expert support for Guardmaster safety relays and industrial safety solutions.

Check stock now or request a quote.

Protect your personnel and equipment with the Allen Bradley MSR127.1T — reliable, high-performance safety relay technology from Drive Outlet Megastore.