Siemens 3RV1042-4FB10 Manual Motor Controller

Siemens 3RV1042-4FB10 is a SIRIUS motor protection switch (manual motor controller) sized for S3 A applications, providing both overload protection and manual disconnection for motors in control panels. It features adjustable overload protection in the 28–40 A range (S3 A-release) and a short-circuit release rated at 520 A for fast fault clearance. The device delivers motor protection up to 100 kA with Class 20 coordination and uses screw-terminal connections for secure wiring, offering increased breaking capacity. This model is commonly employed in motor starters and protection circuits within industrial panels, suitable for conveyors, pumps, and fans where reliable manual shutdown and overcurrent protection are required.