The Siemens 3RN1011-1BM00 is a thermistor motor protection evaluation unit from the SIRIUS 3RN1 family. It monitors motor winding temperature via PTC thermistors and trips the control circuit when the motor overheats, providing a reclosing lockout function after a fault. The unit operates on 230 V AC at both 50 and 60 Hz, and it's built for the control panel: 22.5 mm wide, snaps onto a DIN rail or screws to a backplate, and carries IP20 protection. Two CO (changeover) auxiliary contacts are on board for signaling or latching the trip condition.
The 3RN1011-1BM00 is listed as a phased-out product. The preferred successor is the 3RN2011-1BW30, which is a thermistor motor protection standard evaluation unit with manual/remote reset, 2 W power consumption, and the same 230 V AC supply.
The screw-type terminals are standard for control wiring — no special tooling needed.