Siemens SIRIUS 3RW4455-6BC44 Soft Starter (Phased Out)

The Siemens 3RW4455-6BC44 is a SIRIUS soft starter designed for controlled starting of three-phase motors. It offers high starting currents, with standard values of 693 A and inside-delta values of 1200 A at 400 V and 40 °C. This model operates on 200-460 V AC input power and features screw terminals for connections.

This soft starter is suitable for applications requiring smooth motor acceleration to reduce mechanical stress and electrical inrush current. It is widely used in industrial machinery, pumps, fans, and conveyor systems where controlled motor startup is beneficial.

Please note that the Siemens 3RW4455-6BC44 is a phased-out product. Its successor is the SIRIUS 3RW5 series, with the preferred replacement being the 3RW5553-6HA14. Stanlo Automation, a veteran-owned surplus distributor, can help you source this or comparable replacement parts.