Siemens SIRIUS 3RW4075-6BB45 Soft Starter

The Siemens SIRIUS 3RW4075-6BB45 is a soft starter designed for controlling motor starting current and torque. It is rated for 356 A and supports motor power up to 250 kW at 500 V, operating within a voltage range of 400-600 V AC. This unit features screw terminals for connections and is noted as a phased-out product with a preferred successor available.

This soft starter is used to gradually increase motor voltage during startup, reducing mechanical stress on the motor and connected equipment, and minimizing electrical inrush current. It is suitable for applications such as conveyor systems, pumps, fans, and compressors where smooth motor acceleration is required, typically in manufacturing, processing, and building automation industries.

Stanlo Automation, a veteran-owned supplier of surplus industrial automation parts, offers the Siemens 3RW4075-6BB45. While this is a phased-out product, Stanlo can help you acquire this component if needed for existing systems. We also recommend considering the successor model, the SIRIUS 3RW5, for new installations or upgrades.