Siemens 3RV1021-4BA10 Circuit Breaker

Siemens 3RV1021-4BA10 is a motor‑protection circuit breaker (MPCB) in the S0 size, designed to protect or interrupt power to motors in control panels with precise overcurrent protection. It provides adjustable thermal‑magnetic overload protection with a release setting from 14 to 20 A and an instantaneous short‑circuit trip at 260 A, delivering Class 10 trip characteristics. The device uses screw‑terminal connections and is intended for DIN‑rail mounting to fit compact panels. Typical specifications list it as suitable for motors powered by 220–690 VAC and commonly associated with about 7.5 kW motor protection ratings, reflecting its role in mid‑range motor protection scenarios. Siemens identifies this model as discontinued and points to the 3RV2021‑4BA10 as the preferred successor for new designs.