SIRIUS SOFT STARTER, S12, 280 A, 160 KW/400 V, 40 DEG., 200-460 V AC, 230 V AC, SCREW TERMINALS
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2 Year warranty
| Part Number | 3RW4074-6BB44 |
| Manufacturer | Siemens |
| Type | Breakers |
| Model # | 3RW40746BB44 |
| Warranty | 2 Year |
MRO Electric repairs CNCs, PLCs, Servo/Spindle Drives, Motors, Amplifiers, VFDs, HMIs, and more, most of which can be repaired in only 3-5 days.
MRO can restore your failed 3RW4074-6BB44 to remanufactured condition and save you up to 75% compared to buying new. We offer standard repair pricing to ensure you the best value for your repair.
Our certified technicians use rigorous testing procedures to ensure your parts are restored to fully functioning condition. Our team proudly stands behind all repairs by providing a minimum 2-year warranty.
Our technicians have vast experience with most manufacturers and models. In addition to this 3RW4074-6BB44 we also repair a wide range of other Siemens products, so if you don’t see the model you need, please contact us.
If you are interested in getting credit for your faulty 3RW4074-6BB44, just let us know, and we can issue you an RMA to send it in as an exchange. Our exchange program provides you with savings and keeps us stocked for the next time you need anything.
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Ask about exchanging your faulty 3RW4074-6BB44 for credit when ordering from MRO Electric
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.
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.
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.
Very happy with the overall service, delivery, communication and delivery,
Conley CookeI needed a special drive, found it, and I was quickly assisted by Joe Kaminski. Everything was exactly as it should be....
JackWe have an older DMU80 CNC Machine and the Handheld Control was damaged beyond repair. MRO was very helpful in confirmin...
Abbey-Purchasing Specialist
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