The Siemens 3RN1011-1BG00 is a thermistor motor protection evaluation unit — a standard relay that monitors PTC thermistor sensors embedded in motor windings. It trips on overtemperature, with a reclosing lockout that prevents automatic restart until the fault clears. The unit runs on 110 V AC at both 50 and 60 Hz, and provides 2 changeover (CO) contacts for the control circuit.
Housing is 22.5 mm wide, 91 mm deep, 102 mm tall — a single-module DIN-rail footprint. Fastening is screw and snap-on mounting; screw-type terminals for the auxiliary and control circuit. Rated IP20, so install inside an enclosure with a higher IP-rated door.
Environmental compliance
Substance prohibitance date is 05/28/2009, aligning with early RoHS and REACH compliance milestones.