3RW4038-1TB05 SIRIUS Soft Starter 72A 45kW 500V

Description for 3RW4038-1TB05 SIRIUS Soft Starter 72A 45kW 500V

The Siemens SIRIUS 3RW4038-1TB05 is a robust and high-efficiency soft starter designed for optimal performance in industrial motor applications. Engineered to support motors up to 45 kW at 500 V, with a rated operational current of 72 A, this device provides smooth and reliable acceleration and deceleration of motors, reducing mechanical stress and extending service life.

Operating within a voltage range of 400 to 600 V AC, and controlled via a 24 V AC/DC circuit, the soft starter offers flexibility in installation and system design. Its screw terminal connections provide secure and straightforward wiring, while the integrated thermistor motor protection adds an extra layer of safety by monitoring motor temperature and helping prevent thermal overload.

As part of the SIRIUS 3RW40 soft starter family, the 3RW4038-1TB05 maintains high performance in ambient temperatures up to 40 °C. It is housed in a compact S2 frame size, making it suitable for control cabinets and systems with limited space.

Typical applications include pumps, fans, compressors, conveyors, and other equipment requiring frequent or heavy-duty starts. With proven Siemens reliability and protection compliance, this soft starter ensures long-lasting, energy-efficient operation in demanding industrial environments.