The Siemens 3RN1010-2CW00 is a thermistor motor protection evaluation unit from the SIRUS 3RN1 family — it monitors PTC thermistor sensors embedded in motor windings and trips when the winding temperature exceeds the sensor's rated threshold. It accepts a universal control supply of 24 to 240 V AC/DC, so it drops into panels with mixed voltage rails without swapping modules. Rated IP20, so it belongs inside a closed cabinet.
Lifecycle reality — phased out, successor available
The 3RN1010-2CW00 is a phased-out product. The preferred successor is the 3RN2010-2CW30, a thermistor motor protection standard evaluation unit with the same AUTO function, 1 NO + 1 NC contact configuration, and 24-240 V AC/DC supply, also with spring-type terminals. No last-time-buy window remains open from the factory.