Siemens 3RV1421-0EA10 Motor Protection Circuit Breaker

Siemens 3RV1421-0EA10 Motor Protection Circuit Breaker is a compact 3‑pole motor protector from the SIRIUS 3RV2 family, designed for motor and transformer protection in control panels. Sized as an S0 unit with screw terminals and IP20 enclosure protection, it is intended for indoor cabinet mounting and easy integration with other Siemens protection devices. The device is configured for a nominal current range of 0.28–0.4 A, suitable for small‑motor loads or low‑current transformer protection on 3‑phase circuits with no neutral. It combines thermal overload protection with short‑circuit protection and provides a disconnecting function that can be reset after tripping. The protective characteristics include Class 10 thermal response, aligning with the expected performance of Siemens motor protection circuit breakers in the 3RV2 line. Typical applications include small motors in machinery, pumps, and conveyors, as well as transformers or other equipment within automation panels where Siemens Sirius components are standard. The 3RV1421-0EA10 is intended for panel builders and integrators needing a compact, single‑device solution for motor protection and transformer protection, and it remains compatible with the broader 3RV2 family footprint for straightforward cross‑reference and replacement within Siemens’ protection portfolio.