The Siemens 3RN1000-2AM00 is a compact thermistor motor protection evaluation unit rated for 230 V AC at both 50 and 60 Hz. It is designed to monitor PTC thermistor sensors in motor windings and trip on overtemperature, with a single changeover (CO) auxiliary contact for signaling. The unit is housed in a 22.5 mm wide enclosure with IP20 protection and spring-loaded terminals for tool-free wiring.
The 22.5 mm width fits standard single-module slots.