Allen‑Bradley 440R-M23048 Guardmaster Minotaur MSR15D Safety Relay Module

Product Overview

Core Electrical Specifications

Power Supply

• Supply voltage: 24 V AC / DC universal wide-range input
• Power consumption: <4 VA
• Impulse withstand voltage: 2500 V
• Operating voltage tolerance: -15% ~ +10% nominal voltage

Safety Input Circuit

• Input configuration: 2-channel redundant NC safety input (dual-channel fault detection)
• Compatible devices: E-stop, magnetic safety switches, mechanical guard interlocks, safety mats
• Max allowable input wiring resistance: 45 Ω
• Cross-circuit short-circuit detection for input fault diagnosis

Output Contacts

1. Safety outputs (force-guided positive action contacts):
   • 2 × Instantaneous NO safety contacts (trip immediately when safety circuit opens)
   • 1 × Adjustable delayed NO safety contact (off-delay 0.1 s ~ 10 s via front potentiometer)
2. Auxiliary feedback contact: 1 × NC auxiliary signal contact for PLC/HMI fault monitoring

• Contact rating: 4 A resistive @ 250 VAC; AC-15 / DC-13 load rated
• Force-guided contact design prevents contact welding single-point safety failure

Reset Modes

• Selectable via wiring: Automatic reset or monitored manual reset (requires separate reset button)

Mechanical & Environmental

• Mounting: Standard 35 mm DIN rail horizontal installation
• Dimensions (H×W×D): 118 × 73 × 45.5 mm
• Net weight: 230 g
• Terminal type: Screw-clamp terminals, copper wire 0.5–2.5 mm²
• Protection rating: IP20 (indoor control cabinet only)
• Operating temperature: -20 °C ~ +60 °C
• Storage temperature: -40 °C ~ +85 °C
• Humidity: 5%–95% non-condensing

Safety Compliance & Certifications

• Machinery safety standards: EN ISO 13849-1 Cat.3 / PLd, IEC 60204-1, EN 954-1
• Functional safety: SIL CL2 per IEC 61508 / IEC 62061
• Certifications: TÜV, UL/cUL, CE marked

Status Indicators

Main Functions

1. Dual Redundant Safety Circuit Monitoring

    

   Constantly monitors two independent NC safety input lines. If a safety door opens or E-stop is pressed, the relay detects input loss and cuts safety output circuits. Dual-channel design detects wire short/open faults to eliminate hidden safety failure risks.
2. Immediate + Timed Delayed Safety Shutdown Logic

• Two instantaneous safety contacts instantly disconnect main motor contactor power to stop dangerous motion;
• The adjustable 0.1–10 s delayed contact maintains power for braking circuits, inverter dynamic braking or spindle coast-down control before full power isolation, avoiding abrupt mechanical damage from instant power loss.

3. Dual Reset Operation Modes

• Manual monitored reset: Mandatory operator acknowledgment after safety trip, applied for high-risk stamping, cutting and robotic equipment;
• Automatic reset: Auto-restores safety circuits after safety guard re-closing, suitable for low-risk fan, conveyor and packaging machinery.

4. Auxiliary Fault Signal Feedback

    

   Dedicated NC auxiliary contact transmits safety trip status to PLC, HMI or audible alarm systems for remote fault logging and production line status visualization.
5. Full Self-Diagnosis for Wiring & Hardware Faults

    

   Detects input wire short-circuits, open circuits, internal relay contact faults and power supply anomalies; LED fault codes enable fast on-site troubleshooting without complex testing tools.
6. Force-Guided Safety Contact Protection

    

   All safety outputs adopt positive force-guided contact structure. If one contact welds closed, the other contacts remain open to guarantee machine shutdown, meeting global Category 3 machine safety requirements.

Key Advantages

• Integrated adjustable off-delay timing eliminates external timer relays for braking/coast-down safety logic, reducing cabinet component count
• Universal 24 V AC/DC power input fits all standard industrial control cabinet power systems
• Compact narrow DIN rail housing saves space in dense safety control panels
• Dual-channel input monitoring meets mid-level machinery safety PLd/Cat3 requirements without extra expansion modules
• Visible front potentiometer for quick delay time adjustment without software configuration
• Force-guided safety contacts prevent single contact failure from bypassing safety protection
• Simple screw terminal wiring, no special tools required for field commissioning
• TÜV certified functional safety design for export machinery and international production lines

Typical Applications

• Injection molding, metal stamping and CNC machine safety gate + E-stop control with spindle coast-down delay
• Packaging, textile and printing machinery conveyor safety interlock with motor braking delay
• Robotic work cell safety barrier monitoring with controlled servo power cut-off timing
• Hydraulic/pneumatic press safety circuits requiring delayed valve de-energization
• Food & beverage washdown production line safety guard interlock systems
• Retrofit replacement for legacy MSR15D safety relays on discontinued automation equipment
• General machinery safety control panels needing both instant and timed safety shutdown sequences