Siemens 3RV1021-1CA10 Three-Phase Circuit Breaker

Siemens 3RV1021-1CA10 is a three-pole Sirius motor-protection circuit breaker (size S0) designed to safeguard three‑phase motors on 690 V systems, combining thermal and magnetic trip logic for reliable protection. It provides an adjustable A-rel trip of 1.8–2.5 A and a short-circuit release of 33 A with front-mounted screw terminals for panel assembly. Rated IP20 with an operating temperature range of -20 to +60 C and a mechanical life of about 100,000 switching cycles, this device is intended for DIN-rail or panel-mount motor protection in industrial controls. Siemens lists this model as phased out with the recommended successor 3RV2011-1CA10.