<h2>Overview</h2>
<p>The <strong>Siemens 3RV1021-1DA15</strong> is a manual motor starter protector from the SIRIUS family, designed for reliable overload and short-circuit protection of small motors in industrial control applications. This compact S0 size unit combines a rotary ON/OFF handle with adjustable thermal and magnetic trip elements, making it ideal for machine tools, pumps, fans, and general-purpose motor circuits requiring manual control.</p>
<h2>Key Features</h2>
<ul>
<li><strong>Class 10 Overload Protection:</strong> Adjustable bimetallic heater elements trip in 10 seconds or less at rated overload—critical for motor safety and uptime.</li>
<li><strong>Magnetic Short-Circuit Release:</strong> Set at 42 A for instantaneous protection against phase-to-phase faults and locked rotor conditions.</li>
<li><strong>Rotary Manual Control:</strong> Intuitive ON/OFF dial allows operators to manually adjust motor full-load amperage (FLA) within the 2.2–3.2 A range without tools.</li>
<li><strong>Integral Auxiliary Contacts:</strong> Transverse-mounted 1NO + 1NC switching contacts enable signaling, interlock circuits, and motor disconnection sequencing.</li>
<li><strong>DIN Rail Mount:</strong> Standard 35mm DIN rail installation simplifies panel layout and enables quick swap-out without complex wiring.</li>
<li><strong>Screw Terminal Connection:</strong> Robust, field-friendly screw terminals for reliable, maintenance-free conductivity.</li>
</ul>
<h2>Technical Specifications</h2>
<ul>
<li><strong>Overload Adjustment Range:</strong> 2.2–3.2 AMPS (Class 10)</li>
<li><strong>Short-Circuit Release:</strong> 42 A (magnetic)</li>
<li><strong>Trip Characteristic:</strong> Inverse-time thermal delay (heater-based); instantaneous magnetic trip</li>
<li><strong>Manual Control:</strong> Rotary dial ON/OFF switch</li>
<li><strong>Auxiliary Contacts:</strong> 1NO + 1NC (3RV1901-1E transverse mount)</li>
<li><strong>Mounting:</strong> 35mm DIN rail (standard)</li>
<li><strong>Terminal Type:</strong> Screw terminals</li>
<li><strong>Enclosure Class:</strong> IP20 (typical)</li>
<li><strong>Standards Compliance:</strong> IEC 60947-4-1, UL, CSA</li>
</ul>
<h2>Typical Applications</h2>
<ul>
<li>Machine tool and drilling equipment motor control</li>
<li>Pump and fan starters in HVAC and process systems</li>
<li>General-purpose industrial motors (up to approximately 1.5 kW at 400 V AC)</li>
<li>Manual motor starter in control cabinets and distribution boards</li>
<li>Systems requiring local manual start/stop with overload and fault signaling</li>
</ul>
<h2>Compatibility & Replacements</h2>
<h3>Compatible With</h3>
<ul>
<li>SIRIUS control system components (auxiliary modules, thermal overload relays, contactors)</li>
<li>Standard 35mm DIN rail enclosures and distribution panels</li>
<li>Industrial AC motor circuits: single-phase and three-phase motors</li>
<li>SIRIUS 3RV1901 and 3RV2901 auxiliary contact modules</li>
</ul>
<h3>Replaces / Drop-In Replacement For</h3>
<ul>
<li>Earlier SIRIUS 3RV1 generation motor protectors (same terminal pitch and DIN rail footprint)</li>
<li>Note: This is a legacy product; the modern successor is the <strong>3RV2011-1DA15</strong> (3RV2 series), which offers enhanced performance and continued manufacturer support.</li>
</ul>
<h3>Works With</h3>
<ul>
<li>SIRIUS TIA Portal integration (indirect control via hardwired logic or PLC I/O)</li>
<li>Manual control circuits and hardwired motor starters</li>
<li>PROFIBUS and PROFINET networks (via SIRIUS gateway modules, not direct)</li>
<li>Standard IEC 60947-4-1 compliant control cabinets</li>
</ul>
