The Siemens 3RN1000-2AB00 is a compact thermistor motor protection evaluation unit designed to monitor motor winding temperature via PTC thermistors. It accepts 24 V AC/DC control supply, has a single changeover (CO) auxiliary contact, and uses spring-loaded terminals for quick wiring. The unit is IP20-rated and fits a standard 22.5 mm wide housing, with screw and snap-on mounting for DIN rail.
The 3RN1000-2AB00 is a phased-out product. The preferred successor is the 3RN2000-2AA30, which maintains the same 24 V AC/DC supply and spring-type terminal format while adding AUTO mode.
Key Ratings & Fit
The single CO contact (1 changeover) is sufficient for tripping a motor contactor or signaling a PLC input. The 22.5 mm width matches standard modular enclosures; the 91 mm depth and 84 mm height fit typical compact cabinets.
Mounting & Connections
Mounts via screw or snap-on to DIN rail. The LED display gives a quick visual of the trip status, handy during commissioning or fault finding.