The Siemens 3RN2013-1BA30 is a SIRIUS 3RN2 thermistor motor protection relay — a standard evaluation unit with ATEX approval, open-circuit and short-circuit detection in the sensor circuit, safe disconnection, and non-volatile error memory. The 22.5 mm width and 100 mm height fit a standard 1-module slot in a control panel. Rated for a 24 V control supply, the relay's input circuit monitors PTC thermistors in the motor winding. On overtemperature, it trips and latches — auto-RESET is selectable, and an external reset input is available. The output contacts are rated 1 A at 24 V, 0.2 A at 125 V, and 0.1 A at 250 V, so this is a signal-level switching relay, not a motor-load contactor.
The 22.5 mm width is a single module, so it fits tight panels. IP20 finger-safe housing. Terminals accept solid or stranded wire: 1x 20–12 AWG solid, 2x 20–14 AWG solid; stranded 20–12 AWG. Strip length is standard for the spring-cage or screw clamp (not specified, but typical 8–10 mm). Pollution degree 3 suitable for industrial control cabinets.
Reliability & Diagnostics
MTBF is listed at 97 a, MTTFd at 303 a — these are calculated values for the relay's electronic assembly, not field failure rates. The relay includes a display version LED for local status, non-volatile error memory, and galvanic isolation between input and output and between outputs. Open-circuit and short-circuit detection in the sensor circuit is a key diagnostic for thermistor loop integrity.