<h2>Overview</h2>
<p>The <strong>MDI 35NO-120AT mercury contactor</strong> is a hermetically sealed switching device engineered for reliable, long-life industrial control applications. This 1-pole normally-open unit is rated for 35A continuous current with a 120VAC coil and handles contact voltages up to 480V. The mercury displacement design delivers silent, bounce-free operation with minimal contact wear across millions of cycles.</p>
<h2>Key Features</h2>
<ul>
<li>1-pole normally-open (NO) configuration</li>
<li>Hermetically sealed mercury tube with inert-gas filling</li>
<li>High-quality glass-to-metal seals resist moisture and voltage breakdown</li>
<li>Stainless-steel tube encapsulated in UL-approved epoxy</li>
<li>Silent switching operation with no mechanical noise</li>
<li>Top-terminal connection (AT suffix)</li>
<li>Designed for resistive loads, heating, and lighting applications</li>
</ul>
<h2>Technical Specifications</h2>
<ul>
<li><strong>Contact Arrangement:</strong> 1-Pole Normally Open (NO)</li>
<li><strong>Rated Current:</strong> 35A continuous</li>
<li><strong>Contact Voltage:</strong> Up to 480V AC</li>
<li><strong>Coil Voltage:</strong> 120V AC</li>
<li><strong>Frequency:</strong> 50/60 Hz</li>
<li><strong>Connection Type:</strong> Top Terminals (AT)</li>
<li><strong>Seal Technology:</strong> Hermetically sealed, glass-to-metal seals</li>
<li><strong>Tube Material:</strong> Stainless steel with epoxy encapsulation</li>
<li><strong>Gas Fill:</strong> Inert gas (Argon) for resistive loads</li>
<li><strong>Mounting:</strong> Vertical position required</li>
</ul>
<h2>Typical Applications</h2>
<ul>
<li>Industrial heating systems and process control</li>
<li>Lighting load switching and control</li>
<li>Resistive load management in factory automation</li>
<li>HVAC and thermal control systems</li>
<li>Equipment protection and circuit switching in industrial environments</li>
</ul>
<h2>Compatibility & Replacements</h2>
<h3>Compatible With</h3>
<ul>
<li>Industrial control panels with 120VAC coil-voltage supplies</li>
<li>Heating and lighting control systems up to 480V</li>
<li>Standard industrial electrical enclosures (NEMA/IEC)</li>
<li>Thermal management and process control circuits</li>
</ul>
<h3>Replaces / Drop-In Replacement For</h3>
<ul>
<li>35NO-120A (same spec, but verify terminal style before ordering)</li>
<li>Other mercury contactors with identical 35A, 120VAC, 1-pole configuration</li>
<li>Verify compatibility with your original equipment documentation before installation</li>
</ul>
<h3>Works With</h3>
<ul>
<li>Standard 120VAC control voltage systems</li>
<li>NEMA and IEC control architecture</li>
<li>Industrial relay logic and hard-wired control circuits</li>
<li>Heating system control and thermal management platforms</li>
</ul>
