The Siemens 3RN1010-2CG00 is a thermistor motor protection evaluation unit — it monitors PTC thermistor sensors embedded in motor windings and trips the contactor if the winding temperature exceeds the sensor threshold, protecting against overload or cooling failure. This unit operates on 110 V AC control voltage (50/60 Hz) and provides one normally-open and one normally-closed auxiliary contact for signaling and direct contactor coil interruption.
The 22.5 mm width fits a standard single-module DIN-rail slot — no extra space needed. Screw and snap-on mounting secures it without tools.
RoHS compliance date is 05/28/2009 (substance prohibitance per EU directive). The unit has no reclosing lockout function — after a trip, the auxiliary contacts stay open until the motor cools and the PTC sensor resists below threshold; the evaluation unit then auto-resets. For applications requiring manual reset after a thermal trip, the successor 3RN2010-2CW30 offers that option.