The Siemens 3RN1011-2CB00 is a thermistor motor protection evaluation unit from the SIRUS 3RN1 series. It monitors motor winding temperature via PTC thermistors and trips on over-temperature, with a manual reset reclosing lockout feature. Control voltage is 24 V AC/DC, and the output is 1 normally open plus 1 normally closed contact.
Housing is 22.5 mm wide, 103 mm high, 91 mm deep — standard single-module DIN-rail footprint. IP20 rated, so it belongs inside a closed panel.
The part carries a substance prohibition date of July 1, 2006, indicating RoHS compliance per the EU directive.