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The SIRIUS 3RW4028-1BB04 is a high-performance soft starter from Siemens, designed for efficient and gentle motor startup. This S0-sized device supports motors up to 18.5 kW at 400 V, with a rated operational current of 38 A at 40 °C ambient temperature, making it suitable for a wide range of industrial applications.
It operates over a wide main voltage range of 200–480 V AC and uses a 24 V AC/DC control voltage for flexible integration into control systems. Featuring screw terminals, this model offers straightforward installation and reliable electrical connections.
By limiting inrush current and mechanical stress during motor startup, the 3RW4028-1BB04 extends the service life of motors and connected equipment. It is ideal for applications such as conveyors, pumps, fans, and compressors, where smooth acceleration and deceleration are essential.
| Parameter | Value |
|---|---|
| Range of Product | SIRIUS |
| Product or Component Type | Soft Starter |
| Device Short Name | 3RW4028-1BB04 |
| Applications | Motor starting, conveyors, pumps, fans |
| Utilization Category [Ue] | AC-53A |
| Rated Operational Voltage [Ie] | 200–480 V AC |
| Rated Operational Current [Uc] | 38 A |
| Control Circuit Voltage | 24 V AC/DC |
| Motor Power | 18.5 kW at 400 V |