<h2>Overview</h2>
<p>The CCI CI2120B is a zero speed switch engineered to monitor rotary motion of shafts in conveyor systems and other rotating equipment. This <strong>CCI CI2120B speed switch</strong> provides critical safety interlock functionality by detecting speed loss, mechanical failure, or abnormal rotation conditions. Made in the United States by Control Concepts, the CI2120B is a proven solution for protecting motors and shaft-driven processes in manufacturing and material handling applications.</p>
<h2>Key Features</h2>
<ul>
<li>10 ampere contact rating for reliable electrical switching</li>
<li>SPDT (Single Pole Double Throw) contacts for versatile circuit control</li>
<li>Field-adjustable trip point with brass thumbscrew for on-site tuning</li>
<li>Cast iron housing for durability in demanding industrial environments</li>
<li>Base-mount design for straightforward installation on motor frames or drive shafts</li>
<li>Operates across AC and DC voltage ranges for flexible system integration</li>
</ul>
<h2>Technical Specifications</h2>
<ul>
<li><strong>Contact Rating:</strong> 10 amps AC/DC</li>
<li><strong>Contact Type:</strong> SPDT (Single Pole Double Throw)</li>
<li><strong>Operating Speed Range:</strong> 30–2000 RPM adjustable</li>
<li><strong>Trip Point Range:</strong> 25–70 RPM field-adjustable</li>
<li><strong>Supported Voltages:</strong> 125V, 250V, 480V AC; 125V, 250V DC</li>
<li><strong>Housing Material:</strong> Cast iron</li>
<li><strong>Mounting Style:</strong> Base mount with 1/2" connection</li>
<li><strong>Weight (Cast Iron):</strong> Approximately 8 lbs</li>
</ul>
<h2>Typical Applications</h2>
<ul>
<li>Conveyor system safety interlocks and motor protection</li>
<li>Shaft-driven machinery speed monitoring and failure detection</li>
<li>Overspeed and reverse-rotation detection for critical equipment</li>
<li>PLC and control station signal inputs for automated shutdown sequences</li>
<li>Emergency brake and alarm activation systems</li>
</ul>
<h2>Compatibility & Replacements</h2>
<h3>Compatible With</h3>
<ul>
<li>DC and AC motor control systems operating at 125V, 250V, or 480V</li>
<li>PLC inputs and safety relay circuits</li>
<li>Conveyor and material handling equipment</li>
<li>Industrial automation control stations</li>
<li>Shaft-mounted monitoring applications</li>
</ul>
<h3>Replaces / Drop-In Replacement For</h3>
<ul>
<li>Other Control Concepts 2100 series zero speed switches (CI2120 variants)</li>
<li>Legacy DAZIC-branded zero speed switches with equivalent 10A SPDT configuration</li>
</ul>
<h3>Works With</h3>
<ul>
<li>Hardwired control circuits and safety relays</li>
<li>PLC discrete input modules</li>
<li>Motor soft-starters and VFDs for speed feedback applications</li>
<li>Emergency stop and interlocking safety systems</li>
</ul>
