Allen Bradley 440R-N23135 Safety Relay – MSR127RP, 24V AC/DC, 3 N.O. + 1 N.C. Contacts, Manual Monitored Reset, Removable Terminals

The Allen Bradley 440R-N23135 (MSR127RP) is a Guardmaster single-function safety relay designed for monitoring emergency stop buttons, magnetic safety switches, and optoelectronic protection devices in industrial environments. Operating at a 24V AC/DC supply, it provides three normally open (N.O.) safety contacts and one normally closed (N.C.) auxiliary output for dependable safety circuit management.

Equipped with a manual monitored reset function, this relay ensures safe restart procedures after stop conditions, enhancing system integrity. Supporting single or dual-channel input configurations and rated to Performance Level “e” (EN ISO 13849-1), the MSR127RP delivers exceptional reliability for applications requiring Category 0 stop functionality. The removable plug-in terminal connections simplify wiring and maintenance, making it ideal for high-availability machine safety systems.

Technical Specifications

Model: 440R-N23135 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 monitoring
Safety Outputs: 3 N.O. contacts
Auxiliary Output: 1 N.C. contact (signalling function)
Reset Mode: Manual monitored reset
Performance Level (EN ISO 13849-1): Level e
Stop Category (IEC 60204): 0
Mounting Type: DIN Rail (35mm top hat)
Connection Type: Plug-in terminals (removable)
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
• Input Type: Single or dual-channel configuration supported
• Reset Function: Manual monitored reset for enhanced safety
• Stop Function: Category 0 (immediate stop)
• Performance Level: PL e / Category 4 (IEC 62061)
• Feedback Circuit: Yes, with external contactor monitoring
• Start Input: Yes (manual 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 Type: Compact industrial enclosure for control cabinets

Environmental & Application Suitability

• Typical Applications: Emergency stop monitoring, magnetic door interlocks, and light curtain safety systems
• Monitoring Capability: Single or dual-channel with redundancy verification
• Stop Function: Category 0 for immediate machine shutdown
• Suitable For: E-stop systems, safety switches, and optical guards
• Installation Environment: Industrial control panels and safety relay assemblies

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 ensure secure control circuit interruption.

✅ 1 N.C. auxiliary contact allows for reliable system feedback.

✅ Manual monitored reset enforces operator verification before restart.

✅ Dual-channel monitoring for redundancy and higher safety levels.

✅ Performance Level e and Category 4 compliance for high safety integrity.

✅ Compact 22.5mm housing fits seamlessly into tight control panel layouts.

✅ Removable plug-in terminals simplify wiring and servicing.

📦 Order the Allen Bradley 440R-N23135 from Drive Outlet Megastore

At Drive Outlet Megastore we offer unbeatable Allen Bradley 440R-N23135 prices, with fast UK & EU delivery and expert support for Guardmaster safety relays and machine protection components.

Check stock now or request a quote.

Achieve dependable machine safety control with the Allen Bradley MSR127RP — compact, compliant, and trusted worldwide, available now from Drive Outlet Megastore.