440R-EM4R2D Allen-Bradley Guardmaster Safety Relay
New Sealed | 24V DC
Product Overview
The 440R-EM4R2D New Sealed Allen-Bradley Guardmaster Safety Relay is a high-reliability industrial safety control device designed to monitor and control safety circuits in machine and factory automation systems. Manufactured by Rockwell Automation, this relay is part of the trusted Guardmaster® safety product family, engineered to meet strict industrial safety requirements.
Operating on 24V DC, the 440R-EM4R2D provides dependable monitoring for emergency stop devices, safety gates, and interlock systems, helping protect both personnel and equipment in demanding industrial environments.
Key Features
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100% Genuine Allen-Bradley Product
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Part Number: 440R-EM4R2D
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Condition: New, Factory Sealed
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Product Type: Guardmaster Safety Relay
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Operating Voltage: 24V DC
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Reliable Safety Monitoring & Fast Response
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Compact Design for Control Panels
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DIN Rail Mounting
Technical Specifications
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Supply Voltage: 24V DC
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Safety Outputs: 4 safety relay outputs + 2 auxiliary outputs
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Monitoring Functions: Emergency stop, safety gate, interlock devices
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Reset Type: Manual or monitored reset (system dependent)
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Mounting Type: DIN rail
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Brand: Allen-Bradley
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Manufacturer: Rockwell Automation
📊 440R‑EM4R2D vs Common Guardmaster Safety Relays (Comparison Table)
| Parameter | 440R‑EM4R2D | 440R‑GL2S2P | 440R‑S13R2 | 440R‑EM4R2 |
|---|---|---|---|---|
| Series / Type | EMD Expansion Safety Module | GLP Guardlocking Safety Relay | Single‑Input Safety Relay | EM Safety Expansion Module |
| Part Number | 440R‑EM4R2D | 440R‑GL2S2P | 440R‑S13R2 | 440R‑EM4R2 |
| Brand | Allen‑Bradley (Rockwell Automation) | Allen‑Bradley | Allen‑Bradley | Allen‑Bradley |
| Condition (Typical) | New / Factory Sealed | New / Factory Sealed | New / Factory Sealed | New / Factory Sealed |
| Operating Voltage | 24V DC | 24V DC | 24V DC | 24V DC |
| Safety Outputs | 4 delayed relay outputs (EMD type) | 2 OSSD solid‑state + auxiliary | 3 safety relay outputs | 4 safety relay outputs |
| Auxiliary Outputs | Yes (status / diagnostic) | Yes (N.C. solid state) | Yes (signalling) | Yes (solid state) |
| Function / Use Case | Delayed output expansion (controlled stop) | Guardlocking & proximity safety | Basic safety circuit monitoring | Output expansion |
| Typical Applications | Sequenced safety stop, machine shutdown stages | Guardlocking proximity & emergency stop circuits | Standard emergency stop & safety input monitoring | Expand safety outputs for master relays |
| Mounting | DIN Rail | DIN Rail | DIN Rail | DIN Rail |
| Safety Category & Performance Level* | Up to Cat. 4 / PL e / SIL 3 | Up to Cat. 3 / PL d / SIL 2 | Up to Cat. 3 / PL e / SIL 3 | Up to Cat. 4 / PL e / SIL 3 |
| Typical Power Consumption | ~3.5 W | ~2–2.5 W | ~3.5 W | ~3.5 W |
| Typical Output Current Rating | 2 A per output @ 24V DC | ~0.5–1.6 A max | ~2 A @ 24V DC | ~2 A @ 24V DC |
| Feedback / SWS Support | Yes (SWS input/output) | Yes | Yes | Yes |
| DIN Rail Width (approx) | 22.5 mm | 22.5 mm | ~22.5 mm | 22.5 mm |
| Best Suited For | Complex safety expansion | Advanced guardlocking / proximity systems | Simple safety monitoring | Additional safety outputs |
*Safety category and performance levels depend on the overall safety system design and configuration; actual system compliance should be verified with relevant standards (EN ISO 13849‑1, IEC 61508).
Which Guardmaster Safety Relay Should You Choose?
🔹 440R‑EM4R2D
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Best for complex safety expansions where multiple staged shutdowns are required
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High safety performance: Cat. 4 / PL e / SIL 3
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Ideal for new installations and safety upgrades
CTA: Buy 440R‑EM4R2D Now
🔹 440R‑GL2S2P
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Designed for guardlocking and proximity monitoring
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Perfect when multiple sensor interlocks and OSSD outputs are needed
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Suitable for high-risk machinery with advanced safety systems
CTA: Buy 440R‑GL2S2P Now
🔹 440R‑S13R2
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Simple, single-input safety relay
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Good choice for standard emergency stop circuits or small machinery
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Cost-effective solution for mid-range applications
CTA: Buy 440R‑S13R2 Now
🔹 440R‑EM4R2
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Output expansion module without delayed outputs
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Ideal when extra safety contacts are required beyond the master relay
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Flexible and easy integration into existing Guardmaster systems
CTA: Buy 440R‑EM4R2 Now
⚡ Pro Tips to Maximize Safety & ROI
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✅ Choose the EMD / EM modules for staged shutdown or expansion needs
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✅ Choose GL series for guardlocking or interlock-heavy systems
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✅ Always check safety category / PL / SIL requirements for your machine
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✅ Keep spare units in inventory for critical machine downtime prevention
Applications
The 440R-EM4R2D Guardmaster Safety Relay is widely used in:
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Machine safety control systems
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Emergency stop circuit monitoring
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Safety gate and interlock control
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Packaging, assembly, and production machinery
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Industrial automation safety upgrades
Safety & Compliance
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Designed to meet international machine safety standards
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Suitable for systems requiring high safety integrity levels*
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Trusted by safety engineers and system integrators
* Safety category and performance level depend on overall system design.
Product Condition & Quality Assurance
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Brand New, Factory Sealed Unit
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Inspected for packaging integrity prior to shipment
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Ideal for new installations, replacements, or spare inventory
Why Choose the 440R-EM4R2D Safety Relay?
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Enhances operator and machine safety
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Proven Guardmaster® reliability
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Easy integration into existing safety circuits
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Helps reduce downtime and safety-related faults
Shipping & Packaging
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Original manufacturer packaging
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Secure industrial-grade packing
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Fast worldwide shipping available