<h2>Overview</h2>
<p>The <strong>Pilz PNOZ s3 safety relay</strong> (model 750103) is a dedicated safety module for monitoring emergency stop circuits, safety gates, and light barrier devices in industrial control cabinets. This 24VDC dual-channel relay delivers SIL 3 / PL e Cat. 4 performance and complies with EN 60947-5-1, EN 60204-1, and VDE 0113-1 standards. The redundant design with built-in self-monitoring ensures safety function integrity even upon component failure.</p>
<h2>Key Features</h2>
<ul>
<li><strong>Dual-channel inputs</strong> with automatic short-circuit detection across safety contacts</li>
<li><strong>2 positive-guided NO safety contacts</strong> (instantaneous) rated 6A at 24VDC</li>
<li><strong>1 semiconductor output (Y32)</strong> for PLC feedback (24VDC, 20mA)</li>
<li>Configurable operating modes via rotary switch (manual, automatic, or monitored start)</li>
<li>LED status indicators for power, input status, output status, start circuit, and fault conditions</li>
<li>Redundant circuit with automatic on/off cycle testing</li>
<li>Plug-in or screw terminal connection options</li>
<li>Supports expansion via PNOZsigma contact expansion modules (up to 1 connector per base unit)</li>
</ul>
<h2>Technical Specifications</h2>
<ul>
<li><strong>Supply Voltage:</strong> 24VDC (nom.)</li>
<li><strong>Input Type:</strong> 2 × digital inputs (24VDC, 50mA max per channel)</li>
<li><strong>Safety Outputs:</strong> 2 × NO contacts (6A @ 24VDC DC-1, or 5A @ 24VDC DC-13)</li>
<li><strong>Auxiliary Output:</strong> 1 × semiconductor output Y32 (24VDC, 20mA max)</li>
<li><strong>Safety Category:</strong> ISO 13849-1 Category 4, Performance Level e</li>
<li><strong>SIL Rating:</strong> SIL 3 (IEC 62061)</li>
<li><strong>Mounting:</strong> DIN 35mm rail (rear notch attachment)</li>
<li><strong>Width:</strong> 17.5 mm</li>
<li><strong>Depth:</strong> 120 mm</li>
<li><strong>Length:</strong> 102 mm</li>
<li><strong>Connection:</strong> Screw terminals or spring-loaded plug terminals</li>
<li><strong>Certifications:</strong> CE, cULus, TÃœV, EAC, KOSHA, CCC; complies with 2006/42/EC Machinery Directive</li>
</ul>
<h2>Typical Applications</h2>
<ul>
<li>Emergency stop circuit monitoring in automated machinery</li>
<li>Safety gate or interlock switch monitoring</li>
<li>Light curtain or light barrier device monitoring (types 2 and 4)</li>
<li>Safety-rated control cabinet installations requiring SIL 3 / PL e operation</li>
<li>Industries: automotive, packaging, food processing, material handling, woodworking</li>
</ul>
<h2>Compatibility & Replacements</h2>
<h3>Compatible With</h3>
<ul>
<li>E-STOP pushbuttons and safety control devices</li>
<li>Safety gate limit switches and interlocks</li>
<li>Light barriers and light curtain devices (safety-rated types 2 and 4)</li>
<li>DIN 35mm control cabinet rails</li>
<li>PLC input modules (via semiconductor output Y32 for status feedback)</li>
<li>PNOZsigma contact expansion modules (model-specific; consult datasheet)</li>
</ul>
<h3>Replaces / Drop-In Replacement For</h3>
<ul>
<li>Pilz PNOZ s1 (single-channel, lower safety rating)</li>
<li>Pilz PNOZ s2 (single-channel predecessor)</li>
<li>Pilz 750103 legacy units</li>
</ul>
<h3>Works With</h3>
<ul>
<li>Pilz PAScal software (for safety function SIL/PL calculations per IEC 62061)</li>
<li>Allen-Bradley CompactLogix, ControlLogix PLC platforms (via relay contacts)</li>
<li>Siemens SIMATIC S7 and safety PLCs (via hardwired safety contacts)</li>
<li>Mitsubishi Q-series and FX-series controllers (hardwired integration)</li>
<li>Any safety-rated control system requiring hard-wired, category 4 safety outputs</li>
</ul>
