Siemens 3RV1021-1CA10 Motor Protection Circuit Breaker

Siemens 3RV1021-1CA10 is a Sirius motor protection circuit breaker (S0 size) that combines overload protection with a motor-trip function in a compact module designed for motor control applications. It provides an A‑release adjustable from 1.8 to 2.5 A and a 33 A short-circuit release, enabling selective protection for small motors while guarding against both sustained overloads and instantaneous faults. The unit includes an auxiliary switch, uses screw terminals, and features a front IP20 enclosure, a typical power loss around 6 W, and a mechanical life rated at about 100,000 switching cycles. As part of the Sirius 3RV2 family, the 3RV1021-1CA10 is listed as a legacy model with Siemens identifying 3RV2011-1CA10 as the recommended successor, and Siemens Industry Mall notes it is no longer available.