The Siemens 3RN1012-1CK00 is a thermistor motor protection evaluation unit from the SIRIUS 3RN1 series, designed to monitor motor winding temperature via PTC thermistors and trip on overheat. It operates on 230 V AC at both 50 and 60 Hz, with a contact configuration of 1 NO + 1 NC for alarm and trip signaling.
Mounting and environment
The 22.5 mm width fits a standard single-module DIN-rail footprint, secured by screw and snap-on mounting. Rated IP20 — suitable for dry, enclosed control panels, not for washdown zones. Ambient operating range from -25 to +60 °C covers most indoor industrial environments.