Allen-Bradley 440R-EM4R2 GuardMaster Safety Relay

24V DC Input · Dual Channel Safety Monitoring · New In Box

🧩 Product Overview

The Allen-Bradley 440R-EM4R2 GuardMaster® Safety Relay is a compact safety monitoring relay designed for machinery safety circuits requiring reliable emergency stop and guard door monitoring.

With 24 V DC control voltage, dual-channel safety inputs, and redundant safety outputs, the 440R-EM4R2 helps manufacturers achieve Category 4 / PL e safety architectures when used in compliant systems.

This unit is brand new in original packaging, ideal for machine builders, OEM automation systems, and industrial safety upgrades.

✅ Shopify High-Conversion Bullet Points

✔ Genuine Allen-Bradley GuardMaster® Safety Relay
✔ 24 V DC Control Voltage (5 W power consumption)
✔ Dual-Channel Safety Input Monitoring
✔ Redundant Safety Relay Outputs
✔ Designed for E-Stop & Safety Guard Circuits
✔ Compact DIN-Rail Mount Design
✔ LED Status Indicators for Diagnostics
✔ Brand New In Box – Original AB Packaging

⚙ Key Technical Features

🔐 Dual-Channel Safety Architecture

The 440R-EM4R2 continuously monitors two independent safety input channels, ensuring that faults such as short circuits, cross-faults, or contact welding are detected immediately.

This design supports high-risk machinery applications where single-channel safety is not acceptable.

⚡ Reliable 24V DC Control System

Nominal supply voltage: 24 V DC
Typical power consumption: 5 W

Compatible with standard industrial control panels and safety power supplies.

🧠 Integrated Safety Logic

The relay evaluates:

Emergency stop push buttons
Safety door interlock switches
Light curtain safety contacts (via relay interface)

Ensuring machines cannot restart automatically after a safety event.

🔎 LED Diagnostic Indicators

Front-mounted LEDs provide clear visual feedback for:

Power status
Input channel status
Safety output status

This simplifies commissioning, troubleshooting, and maintenance.

📊 Technical Specifications

Parameter	Specification
Model	440R-EM4R2
Manufacturer	Allen-Bradley (Rockwell Automation)
Series	GuardMaster Safety Relay
Control Voltage	24 V DC
Power Consumption	Approx. 5 W
Safety Inputs	Dual-channel
Safety Outputs	Redundant relay outputs
Monitoring Function	E-Stop, safety gates, interlock switches
Mounting	DIN rail
Indication	LED status indicators
Housing	Industrial flame-retardant enclosure
Condition	Brand New In Box

🏭 Typical Applications

The 440R-EM4R2 is widely used in:

🛑 Emergency Stop (E-Stop) circuits
🚪 Safety door / guard monitoring
🤖 Robotic work cells
🏗 Packaging and assembly machines
⚙ Conveyors and material handling systems
🧰 OEM machine safety panels

🔌 PLC & Safety System Compatibility

Compatible with Allen-Bradley PLC systems
Can be integrated with ControlLogix / CompactLogix safety architectures
Works alongside safety switches, interlocks, and push buttons
Ideal for systems requiring safety relay–based protection (non-safety PLC)

Note: This unit is a safety relay, not a safety PLC. It is used as a standalone safety device or as part of a larger safety system.

🧪 Industrial Reliability

Designed according to international machine safety standards
Suitable for Category 3 / Category 4 architectures (system dependent)
High contact reliability for frequent safety switching
Proven GuardMaster reliability used worldwide

📦 Packaging & Condition

✅ 100% Brand New
✅ Original Allen-Bradley factory box
✅ Uninstalled, unused unit
✅ Carefully packed for international shipment

440R-EM4R2 AB 440REM4R2 Safety Relay GuardMaster Input 24VDC 5W New In Box