The Siemens 3RN1012-2BG00 is a thermistor motor protection standard evaluation unit designed to monitor motor winding temperature via PTC thermistors. The unit provides 2 changeover (CO) contacts for auxiliary signaling or trip output, with no normally-open or normally-closed auxiliary contacts — all switching is through the CO pair.
Mounting & Connections
Housing is 22.5 mm wide, 103 mm tall, and 91 mm deep — a standard single-module footprint that clips onto a DIN rail with the screw-and-snap-on fastening method. IP20 rated, so it belongs in a clean enclosure, not a wet panel.
The unit carries a substance prohibitance date of May 28, 2009, aligning with RoHS and REACH compliance expectations for that era. No UL or CSA marks are listed in the spec record, so verify with your local authority if the installation requires third-party certification.