<h2>Overview</h2>
<p>The <strong>Allen-Bradley 440R-EM4R2</strong> is an expansion module for the Guardmaster safety relay series, designed to add safety output capacity to existing safety relay systems. Operating on a 24V DC PELV/SELV power supply, this module integrates seamlessly with Guardmaster base units to monitor emergency-stop circuits, proximity switches, and other critical safety inputs. With its compact form factor and rail mounting, the 440R-EM4R2 provides a scalable solution for expanding safety functionality without redesigning control architectures.</p>
<h2>Key Features</h2>
<ul>
<li><strong>Four Normally Open (N.O.) Safety Outputs</strong> — Immediate safety outputs for hardwired control logic and downstream safety devices</li>
<li><strong>Single-Wire Safe Input</strong> — Supports one monitoring input with integrated safety-rated diagnostics</li>
<li><strong>Solid-State Auxiliary Output</strong> — One N.C. solid-state output for status indication and system visibility</li>
<li><strong>Low Power Consumption</strong> — Typical 2.8 W, optimizing energy use in safety-critical applications</li>
<li><strong>DIN Rail Mounting</strong> — Standard 22mm enclosure for easy panel integration and field replacement</li>
<li><strong>GuardLink Compatibility</strong> — Includes Dual GuardLink safety relay for intelligent system status visibility when used with GuardLink-enabled smart safety devices</li>
</ul>
<h2>Technical Specifications</h2>
<ul>
<li><strong>Power Supply</strong>: 24V DC (PELV/SELV standard)</li>
<li><strong>Power Consumption</strong>: Typical 2.8 W</li>
<li><strong>Power-On Delay</strong>: Max 7 seconds (typical 5.5 seconds)</li>
<li><strong>Safety Outputs</strong>: 4 × N.O. immediate safety outputs</li>
<li><strong>Auxiliary Output</strong>: 1 × N.C. solid-state</li>
<li><strong>Input Monitoring</strong>: 1 × single-wire safe input</li>
<li><strong>Continuous Output Current</strong>: Max 50 mA per output</li>
<li><strong>Reaction Time</strong>: 100 ms (safety outputs)</li>
<li><strong>Response Time</strong>: 45 ms (safety and single-wire outputs)</li>
<li><strong>Operating Temperature</strong>: −5°C to +55°C (23°F to 131°F)</li>
<li><strong>Terminal Protection</strong>: IP20 (standard) / IP40 (optional)</li>
<li><strong>Dimensions</strong>: 119.14 mm (L) × 22.5 mm (W) × 113.6 mm (H)</li>
<li><strong>Weight</strong>: 0.4 lbs (0.18 kg)</li>
<li><strong>Mounting</strong>: 22mm DIN rail</li>
<li><strong>Certifications</strong>: UL, CUL, CCC, KC</li>
</ul>
<h2>Typical Applications</h2>
<ul>
<li>Emergency-stop circuit monitoring and control</li>
<li>Proximity switch and interlock monitoring</li>
<li>Guard door and gate safety interlocks</li>
<li>Machine safeguarding and personnel protection systems</li>
<li>Expansion of existing Guardmaster safety relay capacity without system redesign</li>
<li>Multi-zone safety logic and reset timing configurations</li>
</ul>
<h2>Compatibility & Replacements</h2>
<h3>Compatible With</h3>
<ul>
<li>Rockwell Automation 440R Guardmaster safety relay series</li>
<li>Guardmaster-enabled control systems with 24V DC safety bus</li>
<li>GuardLink wireless and wired safety device networks (when GuardLink-compatible components are present)</li>
<li>Standard DIN rail enclosures (22mm rail width)</li>
<li>Safety control panels requiring hardwired safety outputs</li>
</ul>
<h3>Replaces / Drop-In Replacement For</h3>
<p>The 440R-EM4R2 is a direct expansion module for Guardmaster base units. Verify compatibility with your specific Guardmaster controller model before ordering.</p>
<h3>Works With</h3>
<ul>
<li>Guardmaster safety relay control logic (hardwired safety outputs)</li>
<li>PELV/SELV safety-rated power distribution</li>
<li>Emergency stop (E-stop) pushbuttons and safety interlocks</li>
<li>Proximity sensors and discrete safety inputs</li>
<li>Standard safety-rated control circuits per NFPA, IEC, and EN standards</li>
</ul>
