The Siemens 3RN1012-1BM00 is a thermistor motor protection evaluation unit from the SIRIUS family, designed to monitor motor winding temperature via PTC thermistor sensors. It operates on a 230 V AC supply at both 50 Hz and 60 Hz, making it suitable for fixed-frequency motor control panels globally. The unit provides two CO (changeover) contacts for auxiliary signaling, allowing it to trip a contactor or alert a PLC when the motor exceeds its safe temperature threshold. A reclosing lockout function prevents automatic restart after a trip, which is critical for personnel safety and equipment protection on motor circuits. Housed in a 22.5 mm wide enclosure with IP20 protection, it mounts via screw or snap-on onto a DIN rail. The screw-type terminals accept standard control wiring, and the operating temperature range of -25 to +60 °C covers most industrial environments.
Siemens 3RN1012-1BM00 Thermistor Motor Protection, 230 V AC
MPN3RN1012-1BM00
Siemens SIRIUS 3RN1012-1BM00 thermistor motor protection evaluation unit, 230 V AC, 50/60 Hz, 2 CO contacts, IP20, 22.5 mm width, screw-type terminals.
StockContact for availability
MOQ1 pcs
Sourced new & surplus through independent channelsListing updated Jul 2026
Specifications
Electrical
| Parameter | Value |
|---|---|
| Rated value (50 Hz) | 230 V |
| Rated value (60 Hz) | 230 V |
Environmental
| Parameter | Value |
|---|---|
| Ingress protection (IP rating), wired | IP20 |
Mechanical
| Parameter | Value |
|---|---|
| Fastening method | screw and snap-on mounting |
| Width | 22.5 mm |
| Height | 102 mm |
| Depth | 91 mm |
Product details
Frequently asked questions
What replaces the 3RN1012-1BM00?
The official successor is the 3RN2012-1BW30, a thermistor motor protection evaluation unit with manual/auto/remote selection and 2 W power consumption at 230 V AC.
What are the key ratings of the 3RN1012-1BM00?
It is rated for 230 V AC at 50/60 Hz, has 2 CO contacts, an IP20 enclosure, and operates from -25 to +60 °C. The unit is 22.5 mm wide and mounts on a DIN rail via screw or snap-on.
MPN
3RN1012-1BM00