Siemens 3RW4074-6BB44

Siemens 3RW4074-6BB44 SIRIUS Soft Starter

The Siemens 3RW4074-6BB44 is a heavy-duty SIRIUS soft starter engineered for high-performance motor control in industrial applications. Designed to manage the startup and shutdown of large motors, this device ensures reduced electrical and mechanical stress, smoother operations, and extended equipment life. With a robust 280 A rated current and the ability to control motors up to 160 kW at 400 V, this soft starter is ideal for high-demand systems such as pumps, compressors, conveyors, and mixers.

This model belongs to the Siemens SIRIUS 3RW40 series, known for its reliable, compact soft starters designed for motors requiring smooth acceleration and deceleration. The 3RW4074-6BB44 operates on a wide supply voltage range of 200–460 V AC, with a 230 V AC control voltage, making it adaptable to various global standards and compatible with most control systems. Its Size S12 form factor is suited for large motors, while screw terminals ensure secure and efficient wiring during installation.

Key benefits of using this Siemens soft starter include minimizing torque spikes, reducing current surges, and avoiding mechanical stress on connected components. These features help lower maintenance costs and improve system longevity, especially in applications where frequent starts and stops occur. The device also features a soft stop function, providing smooth motor deceleration that's especially important for systems with high inertia or sensitive mechanical setups.

Designed to perform reliably in industrial environments, the 3RW4074-6BB44 can operate in ambient temperatures up to 40°C (104°F) without derating. It's an excellent fit for industries such as manufacturing, water treatment, HVAC, mining, and materials handling.

Available now at MRO Electric and Supply, the Siemens 3RW4074-6BB44 comes with a 2-year warranty for added peace of mind. It is in stock and ready for immediate shipping, and free shipping is included with every order, helping reduce procurement delays and downtime.

Frequently Asked Questions (FAQ)

What does the Siemens 3RW4074-6BB44 soft starter do?

It provides soft motor startup and shutdown, reducing electrical inrush and mechanical wear on equipment.

What motor size does it support?

This unit supports motors up to 160 kW at 400 V.

What is the rated current?

The soft starter is rated at 280 amps, ideal for large motor loads.

What supply voltage does it operate on?

It operates on a voltage range of 200–460 V AC.

What control voltage does it require?

The device uses a 230 V AC control voltage for logic and switching operations.

What Siemens size classification is this model?

It is classified as Size S12 within the Siemens SIRIUS soft starter lineup.

What type of terminal connection does it have?

It uses screw terminals for secure and easy electrical connections.

Can it handle high-temperature environments?

Yes, it operates efficiently up to 40°C (104°F) without performance loss.

What applications is it suited for?

Ideal for pumps, fans, compressors, conveyors, and industrial automation systems.

Is it available for fast delivery?

Yes, MRO Electric has it in stock, with free shipping and a 2-year warranty.

Enhance your industrial motor control system with the Siemens 3RW4074-6BB44 soft starter, available now at MRO Electric and Supply—where reliability, speed, and expert support come standard.

Siemens products are manufactured in Germany and are designed for Automotive, aerospace, power generation, and electronics usage. They come with a 2-year warranty from MRO Electric. We also carry Breakers from other manufacturers such as FANUC and Yaskawa.

Contact Us Today For More Information About the 3RW4074-6BB44

Check out the rest of our Siemens product line. Whether it's using our online instant quote feature, giving us a call at (800) 691-8511, or emailing us at sales@mroelectric.com, we strive for customer satisfaction first. This means lower prices and better service for you. For more products like 3RW4074-6BB44, take a look at more from our Breakers line. If your current unit has gone bad, take advantage of our Core Exchange program for the most inexpensive route. You can learn more about this program on our FAQ page here. We offer a repair service on all of our 3RW4074-6BB44 products that keep your downtime to a minimum. To stay up to date on manufacturer news, as well as access any of our datasheets, manuals, or other documentation, we suggest you take a look at our blog.