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

🏭 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