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. 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.
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.
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026
Specifications
| Parameter | Value |
|---|---|
| Rated value (50 Hz) | 230 V |
| Rated value (60 Hz) | 230 V |
| Parameter | Value |
|---|---|
| Ingress protection (IP rating), wired | IP20 |
| 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