Allen Bradley 440R-B23020 Safety Relay – MSR5T, 24V AC/DC, 3 N.O. Safety Outputs, 1 N.C. Auxiliary, Automatic/Manual Reset

The Allen Bradley 440R-B23020 (MSR5T) is a monitoring safety relay designed for emergency stop and general safety circuit monitoring in industrial machinery. Operating with a flexible 24V AC/DC supply, this unit offers three normally open (N.O.) safety outputs and one normally closed (N.C.) auxiliary output, providing dependable control in both automatic and manual reset configurations.

Built for single-channel safety input monitoring, the MSR5T meets Performance Level “e” in compliance with EN ISO 13849-1 and is suitable for Category 0 stop functions according to IEC 60204. With a compact 22.5mm-wide housing and DIN rail mounting capability, it is an ideal choice for machine builders requiring space-efficient, reliable safety control solutions.

Technical Specifications

Model: 440R-B23020 Allen Bradley
Series: MSR5T Safety Relay
Product Type: Monitoring Safety Relay
Supply Voltage: 24V AC/DC (50 Hz)
Voltage Type: AC/DC
Input Type: 1-channel safety input (1 N.C.)
Safety Outputs (Instantaneous): 3 N.O. contacts
Auxiliary Output: 1 N.C. contact
Performance Level (EN ISO 13849-1): Level e
Stop Category (IEC 60204): 0
Reset Modes: Automatic or Manual
Mounting Type: DIN Rail (35mm top hat)
Connection Type: Screw terminals
Dimensions (W x H x D): 22.5 x 75 x 110 mm

Electrical & Performance Details

• Supply Voltage Range: 24V AC/DC ±10%
• Safety Outputs: 3 N.O. relay contacts for safety circuits
• Auxiliary Output: 1 N.C. relay contact for signalling or diagnostics
• Input Configuration: Single-channel with monitored feedback circuit
• Feedback Circuit: Yes (external contactor monitoring supported)
• Safety Category: Category 4 / Performance Level e
• Stop Function: Category 0 emergency stop (immediate removal of power)
• Start Input: Yes (supports manual or automatic start)
• Muting Function: No

Mechanical Specifications

• Width: 22.5 mm
• Height: 75 mm
• Depth: 110 mm
• Mounting: DIN rail (35mm)
• Connection: Screw terminal type
• Housing: Slimline industrial enclosure for control panel integration

Environmental & Application Suitability

• Typical Applications: Emergency stop systems, machine safety interlocks, and light machine safety circuits
• Stop Category: Category 0 stop for immediate shutdown
• Monitoring Capability: Single-channel input with feedback monitoring
• Suitable For: Emergency stop push buttons and safety circuit monitoring
• Not Suitable For: Magnetic switches, optoelectronic sensors, or tactile sensors
• Installation Environment: Industrial control panels and safety enclosures

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
• CE Marked: Yes
• RoHS Compliant: Yes

Key Features & Benefits

✅ Dual-voltage operation with 24V AC/DC flexibility.

✅ 3 N.O. safety contacts for reliable safety output switching.

✅ 1 N.C. auxiliary contact for system feedback or diagnostics.

✅ Automatic or manual reset configuration for operational flexibility.

✅ Compact 22.5mm housing for space-efficient panel integration.

✅ Category 0 stop function for immediate emergency power disconnection.

✅ Feedback circuit monitoring ensures external contactor integrity.

📦 Order the Allen Bradley 440R-B23020 from Drive Outlet Megastore

At Drive Outlet Megastore we offer unbeatable Allen Bradley 440R-B23020 prices, with fast UK & EU delivery and professional support for Guardmaster safety systems and industrial safety relay applications.

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Ensure dependable emergency stop functionality with the Allen Bradley MSR5T safety relay — precision-built for compliance, reliability, and ease of integration at Drive Outlet Megastore.