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The Siemens 3RW4028-1TB05 from the SIRIUS 3RW40 series is a compact and efficient soft starter designed for three-phase motors up to 22 kW at 500 V. With a rated current of 38 A, it enables smooth motor startup and shutdown, significantly reducing mechanical stress and extending equipment life.
This unit supports supply voltages from 400 to 600 V AC and operates with a 24 V AC/DC control circuit, offering flexible integration into industrial control systems. The device comes equipped with screw terminals for secure and straightforward wiring, and includes thermistor motor protection, providing advanced safety against overheating.
Designed for use in applications such as pumps, fans, compressors, and conveyor systems, it is ideal for maintaining reliability in demanding environments up to 40°C ambient temperature. The S0 size form factor ensures compatibility with standard control panel layouts while maintaining Siemens' trusted build quality.
| Attribute | Value |
|---|---|
| Range of Product | SIRIUS 3RW40 |
| Product or Component Type | Soft Starter |
| Device Short Name | 3RW4028-1TB05 |
| Applications | Pump, fan, conveyor, compressor, motor start |
| Utilization Category [Ue] | AC-53A |
| Rated Operational Voltage [Ie] | 400–600 V AC |
| Rated Operational Current [Uc] | 38 A |
| Control Circuit Voltage | 24 V AC/DC |
| Motor Power | 22 kW (at 500 V) |