Allen Bradley 440R-N23126 Safety Relay – MSR127T, 24V AC/DC, 3 N.O. + 1 N.C. Contacts, Automatic/Manual Reset, Fixed Terminals

The Allen Bradley 440R-N23126 (MSR127T) is a single-function Guardmaster safety relay engineered for reliable monitoring of emergency stop circuits, magnetic safety switches, and optoelectronic protection equipment. Operating at a 24V AC/DC supply voltage, it offers three normally open (N.O.) safety contacts and one normally closed (N.C.) auxiliary output for flexible control and signalling.

This model supports both automatic and manual reset modes and features fixed screw terminal connections for secure, long-term wiring integrity. Designed to achieve Performance Level “e” according to EN ISO 13849-1 and Category 0 stop per IEC 60204, the MSR127T delivers dependable safety performance in critical industrial control applications. Its compact 22.5mm housing enables high-density installation within control panels.

Technical Specifications

Model: 440R-N23126 Allen Bradley
Series: Guardmaster MSR
Product Type: Single-Function Safety Relay
Supply Voltage: 24V AC/DC (50 Hz)
Voltage Type: AC/DC
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: Fixed screw terminals
Dimensions (W x H x D): 99 x 114.5 x 22.5 mm

Electrical & Performance Details

• Supply Voltage Range: 24V AC/DC ±10%
• Output Configuration: 3 N.O. safety outputs + 1 N.C. auxiliary output
• 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)
• Connection Type: Fixed screw terminal wiring

Mechanical Specifications

• Width: 99 mm
• Height: 114.5 mm
• Depth: 22.5 mm
• Mounting: Standard 35mm DIN rail
• Connection Type: Fixed screw terminals
• Housing Type: Slimline industrial-grade enclosure

Environmental & Application Suitability

• Typical Applications: Emergency stop monitoring, magnetic interlocks, and light curtain systems
• Monitoring Capability: Single or dual-channel configuration for redundancy
• Stop Function: Category 0 (immediate machine stop)
• Suitable For: E-stops, safety switches, and optoelectronic protection devices
• Installation Environment: Industrial control panels 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

✅ Three N.O. safety outputs provide robust circuit protection.

✅ One N.C. auxiliary output for reliable system signalling.

✅ Selectable auto/manual reset adapts to different machine safety setups.

✅ Performance Level e for high reliability and functional safety.

✅ Compact 22.5mm design saves valuable control panel space.

✅ Fixed screw terminals ensure secure long-term wiring connections.

✅ Category 0 stop function for immediate machine shutdown in hazardous events.

📦 Order the Allen Bradley 440R-N23126 from Drive Outlet Megastore

At Drive Outlet Megastore we offer unbeatable Allen Bradley 440R-N23126 prices, with fast UK & EU delivery and expert support for Guardmaster safety relays and industrial protection systems.

Check stock now or request a quote.

Enhance your machinery safety with the Allen Bradley MSR127T — compact, reliable, and performance-rated for critical industrial applications, available now from Drive Outlet Megastore.