Siemens 3RV1042-4FB10 Manual Motor Controller

Siemens 3RV1042-4FB10 Manual Motor Controller is a three-pole SIRIUS motor protection switch that provides manual on/off control and motor protection for 3-phase motors in industrial automation. Belonging to the 3RV1x/3RV10 family, this device combines a mechanical operator with protective functions in a compact enclosure for use in control panels or motor starters. The model is specified for a 28–40 A current range, making it suitable for mid-sized motors and related equipment such as conveyors, pumps, and fans where reliable disengagement and protection are required. As part of Siemens’ SIRIUS line, it shares common mounting footprints and interface conventions with other 3RV devices, enabling straightforward integration with protection schemes, accessories, and auxiliary contacts. Designed to deliver secure, visible switching for motor circuits, the 3RV1042-4FB10 provides a robust solution for operators who need a clear, manually actuated method to isolate a motor while maintaining consistent protection coordination with other Siemens protection components.