Siemens 3RV1042-4HB10 U Motor Protection Circuit Breaker

The Siemens 3RV1042-4HB10 U is a three‑pole motor protection circuit breaker in the Sirius 3RV1042 family, sized for motor protection with an overload release range of 36–50 A (A‑release) and a short‑circuit release rated at 650 A (N‑release). It is rated for up to 690 V and provides motor protection up to 100 kA breaking capacity, with Class 20 trip characteristics. The device uses screw‑terminal connections for the main circuit and features removable terminals for auxiliary and control circuits, facilitating wiring in panel installations. With an IP20 front protection rating and a compact S3 frame, this MPCB is suited for motor applications in industrial panels, including fans, pumps, conveyors, and other 3‑phase motors up to 690 V. This model delivers reliable overload and short‑circuit protection in a single compact unit, simplifying motor protection scheme design in electrical installations.