Allen Bradley 440R-M23088 Safety Relay – MSR138.1DP, 24V AC/DC, 3 Delayed N.O. + 2 Instantaneous N.O. Safety Outputs, Adjustable 0.5–10s Delay

The Allen Bradley 440R-M23088 (MSR138.1DP) is a monitoring safety relay with delayed outputs designed to provide flexible, controlled shutdown functionality for safety-critical applications. Operating from a 24V AC/DC supply, it offers three delayed and two instantaneous normally open (N.O.) safety outputs for both immediate and time-delayed circuit interruption, ensuring personnel and machine safety during emergency or controlled stop conditions.

Supporting single or dual-channel input configurations and compliant with Performance Level “e” per EN ISO 13849-1, the MSR138.1DP ensures reliable monitoring of emergency stop, magnetic switch, and optoelectronic protection systems. The adjustable release delay (0.5 to 10 seconds) allows for smooth, controlled machine deceleration during power-down. With DIN rail mounting and removable plug-in terminals, it’s built for easy installation, service, and high integration flexibility.

Technical Specifications

Model: 440R-M23088 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 0.5…10 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: 0.5 to 10 seconds adjustable via potentiometer
• Safety Category: Category 4 / Performance Level e
• Stop Function: Category 1 controlled stop (IEC 60204)
• 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: 35mm DIN rail
• Connection: Plug-in removable terminals with detachable clamps
• Construction: Compact, modular safety relay housing

Environmental & Application Suitability

• Typical Applications: Emergency stop monitoring, magnetic interlocks, light curtain systems, and other optoelectronic protection equipment
• Stop Function: Category 1 controlled stop with delay
• Monitoring Capability: Single and dual-channel safety device inputs
• Suitable For: E-stop buttons, magnetic safety switches, and optical guards
• Not Suitable For: Proximity, position, or tactile sensors
• Installation Environment: Industrial control cabinets and safety panels

Compliance & Certifications

• Performance Level: PL e (EN ISO 13849-1)
• 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 versatile circuit control.

✅ Adjustable time delay (0.5–10s) for controlled stop operation.

✅ Dual-channel input monitoring enhances fault detection and safety integrity.

✅ Supports emergency stop and optical guard systems for wide application coverage.

✅ Performance Level e ensures maximum safety compliance.

✅ Removable terminals simplify installation and maintenance.

✅ Compact housing saves valuable panel space in safety circuits.

📦 Order the Allen Bradley 440R-M23088 from Drive Outlet Megastore

At Drive Outlet Megastore we offer unbeatable Allen Bradley 440R-M23088 prices, with fast UK & EU delivery and expert technical support for Guardmaster safety relays and machine safety applications.

Check stock now or request a quote.

Achieve precise, reliable machine control with the Allen Bradley MSR138.1DP safety relay — trusted Guardmaster performance from Drive Outlet Megastore.