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🛡️ Allen-Bradley 440R-M23088 – Guardmaster MSR138.1DP Safety Relay with Delayed Outputs

Protect personnel and machinery with the Allen-Bradley 440R-M23088, a versatile safety relay from the Guardmaster MSR138 series. Designed for dual-channel input monitoring and configurable reset modes, this relay supports both immediate and delayed safety outputs—ideal for light curtains, emergency stops, and gate switches.

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✅ Key Features & Technical Specifications

• Part Number: 440R-M23088
• Series: Guardmaster MSR138.1DP
• Function: Safety monitoring relay with delayed outputs
• Input Configuration:
  • Supports 1 or 2 N.C. inputs
  • Compatible with PNP light curtain signals
  • Cross-fault detection supported
• Supply Voltage: 24V AC/DC
• Safety Outputs:
  • 2 × NO (immediate)
  • 2 × NO (delayed, 0.5–10 sec adjustable)
• Auxiliary Output:
  • 1 × NC (delayed)
• Reset Modes:
  • Automatic
  • Manual
  • Monitored manual
• Terminal Type: Removable screw terminals
• Housing Dimensions:
  • Width: 99 mm
  • Height: 114.5 mm
  • Depth: 45 mm
• Operating Temperature: –5°C to +55°C
• Enclosure Rating: IP40 (NEMA 1)
• Terminal Protection: IP20
• Safety Standards:
  • ISO 13849-1: Category 4 / PL e
  • IEC 61508: SIL 3
• Certifications: CE, UL, TUV
• Lifecycle Status: Active

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🔁 Related Models in the MSR138 Series

Model Code	Part Number	Outputs	Reset Type	Notes
440R-M23076	MSR138.1T	2 NO	Manual/Auto	Immediate outputs only
440R-M23077	MSR138.2T	2 NO + 1 NC	Monitored manual	With auxiliary output
440R-M23087	MSR138.1DP	2 NO + 2 NO delay	Manual/Auto	No auxiliary output
440R-M23089	MSR138.2DP	2 NO + 2 NO delay	Monitored manual	Enhanced diagnostics

All models share the same mounting footprint and terminal layout, with output and reset logic variations for flexible integration.

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📦 Why Choose Allen-Bradley 440R-M23088?

• Dual-channel input monitoring for enhanced fault detection
• Delayed safety outputs for controlled shutdown sequences
• Flexible reset modes to suit various safety architectures
• Compact DIN rail housing for streamlined panel integration
• Certified to SIL 3 / PL e for high-risk applications

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