Siemens 3RN1010-2CG00 Thermistor

Siemens 3RN1010-2CG00 Thermistor is a thermistor-based motor protection relay in the Siemens SIRIUS 3RN1 family, designed as a Thermistor Motor Protection Standard Evaluation Unit Auto with 1 normally open and 1 normally closed auxiliary contact and a 110 V AC control supply. It operates on 50 Hz (and 60 Hz) and features a single measuring circuit with no auxiliary change-over contacts. The unit provides auto-reset protection, with no fault storage and no external reset required. Temperature sensing covers a range from 60 °C (initial/measurable) to 180 °C (full-scale), enabling timely tripping on motor overheating and automatic restart once conditions normalize. Wiring uses spring-loaded terminals for secure connections, facilitating straightforward installation in control panels or motor circuits. Typical use cases include protecting AC motors in industrial machinery and automation setups where Siemens thermistor protection is specified, delivering compact, integrated monitoring and automatic reset behavior within the Sirius 3RN1 protection ecosystem.