Siemens 3RN1012-1CK00 Sirius Motor Protector is a thermistor-based motor protection device designed to monitor motor windings for overheating and trip the circuit before damage occurs, part of the SIRIUS 3RN1 family. It operates from 230/110 V AC at 50/60 Hz, provides one normally open and one normally closed contact, uses screw-terminal connections, and includes a standard evaluation unit with manual, auto, and remote operating modes. Siemens notes that this model is no longer available and the preferred successor is 3RN2012-1BW30.
