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The SIRIUS 3RW4037-2TB05 soft starter from Siemens is a compact, high-performance motor starter designed for reducing mechanical stress and current peaks during motor startup. With a rated operational current of 63 A, it supports motors up to 37 kW at 500 V in standard duty applications.
This unit operates on a main voltage range of 400–600 V AC and utilizes a 24 V AC/DC control voltage, making it ideal for a wide range of industrial control systems. The soft starter features spring-type terminals for quick, reliable wiring, ensuring vibration-resistant and maintenance-free connections.
Built with integrated thermistor motor protection, the 3RW4037-2TB05 ensures added safety by protecting motors from overheating, extending motor life and reducing downtime. It is engineered to perform reliably in ambient temperatures up to +40°C, and its compact design facilitates easy integration into control panels, saving valuable space.
Part of the trusted SIRIUS S2 series, this soft starter delivers a robust, energy-efficient solution for controlled motor starting and stopping—ideal for pumps, fans, conveyors, and more.
| Parameter | Details |
|---|---|
| Range of Product | SIRIUS |
| Product or Component Type | Soft Starter |
| Device Short Name | 3RW4037-2TB05 |
| Applications | Pump, fan, conveyor, and general motor applications |
| Utilization Category [Ue] | AC-53A |
| Rated Operational Voltage [Ie] | 400–600 V AC |
| Rated Operational Current [Uc] | 63 A |
| Control Circuit Voltage | 24 V AC/DC |
| Motor Power | 37 kW (at 500 V AC) |