Allen Bradley 440R-M23143 Safety Relay – MSR138DP, 24V AC/DC, 3 Delayed + 2 Instantaneous N.O. Safety Outputs, Adjustable 0.15–3s Delay

The Allen Bradley 440R-M23143 (MSR138DP) is a monitoring safety relay with delayed outputs designed to provide controlled stop functionality for emergency stop circuits, magnetic safety switches, and optoelectronic protection equipment. Operating on a 24V AC/DC supply, this versatile module includes three delayed and two instantaneous normally open (N.O.) safety outputs for reliable, flexible circuit management.

With adjustable release delay settings between 0.15 and 3 seconds, the MSR138DP enables precision control of shutdown timing, helping to ensure safe deceleration of machinery before complete power isolation. Supporting single or dual-channel inputs and rated to Performance Level “e” (EN ISO 13849-1), this compact DIN rail-mounted safety relay offers high integrity and durability for advanced industrial safety applications.

Technical Specifications

Model: 440R-M23143 Allen Bradley
Series: Guardmaster MSR
Product Type: Monitoring Safety Relay with Delayed Outputs
Supply Voltage: 24V AC/DC (50 Hz)
Voltage Type: AC/DC
Input Configuration: 1-channel or 1- and 2-channel
Safety Outputs (Delayed): 3 N.O. contacts
Safety Outputs (Instantaneous): 2 N.O. contacts
Auxiliary Outputs: None
Performance Level (EN ISO 13849-1): Level e
Stop Category (IEC 60204): 1
Release Delay: Adjustable 0.15…3 seconds
Mounting Type: DIN Rail (35mm top hat)
Connection Type: Plug-in removable terminals
Dimensions (W x H x D): 99 x 114.5 x 45 mm

Electrical & Performance Details

• Supply Voltage Range: 24V AC/DC ±10%
• Safety Outputs: 3 delayed + 2 instantaneous N.O. contacts
• Output Type: Electromechanical relay contacts
• Input Type: Single or dual-channel monitoring
• Release Delay: 0.15 to 3 seconds adjustable
• Stop Function: Category 1 (controlled stop)
• Safety Category: Category 4 / Performance Level e
• Feedback Circuit: Yes, for external contactor monitoring
• Start Input: Yes (manual or automatic start supported)
• Muting Function: No

Mechanical Specifications

• Width: 99 mm
• Height: 114.5 mm
• Depth: 45 mm
• Mounting: Standard 35mm DIN rail
• Connection: Plug-in removable terminal blocks
• Housing: Compact industrial-grade enclosure for control panels

Environmental & Application Suitability

• Typical Applications: Emergency stop monitoring, magnetic door switches, light curtain interfaces, and controlled stop machinery
• Monitoring Capability: Supports single or dual-channel inputs for redundancy
• Stop Function: Category 1 controlled stop (delayed power-down)
• Suitable For: Emergency stops, magnetic and optical protection devices
• Not Suitable For: Position switches, proximity sensors, or tactile edges
• Installation Environment: Industrial control panels and machine safety cabinets

Compliance & Certifications

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

Key Features & Benefits

✅ Five safety outputs (3 delayed + 2 instantaneous) for advanced stop control.

✅ Adjustable delay (0.15–3s) for precise machine shutdown sequencing.

✅ Dual-channel input monitoring for enhanced redundancy and safety integrity.

✅ Category 1 stop function supports controlled deceleration.

✅ Performance Level e ensures top-tier compliance and reliability.

✅ Plug-in terminal blocks simplify maintenance and replacement.

✅ Compact design ideal for integration in space-limited control cabinets.

📦 Order the Allen Bradley 440R-M23143 from Drive Outlet Megastore

At Drive Outlet Megastore we offer unbeatable Allen Bradley 440R-M23143 prices, with fast UK & EU delivery and expert support for Guardmaster safety systems and delayed-output control relays.

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Enhance your machine safety systems with the Allen Bradley MSR138DP — precision-timed, high-reliability safety relay solutions from Drive Outlet Megastore.