Receive a Text Quote
We will send you price and availability shortly
Invalid number. Please call (800) 691-8511
Looking for a fast quote? Click here, and we'll text you.

2-year Warranty

Same Day Shipping

Siemens 3RW4055-6BB34

SIRIUS SOFT STARTER, S6, 117 A, 75 HP/460 V, 50 DEG., 200-460 V AC, 115 V AC
1 rating

1 in stock

Free Shipping

2 Year warranty

Part Number3RW4055-6BB34
Model #3RW40556BB34
Warranty2 Year
DescriptionSoft Starter
Current rating117 Amps at 50 °C
Opperating current1.15
Degree of pollution3, acc. to IEC 60947-4-2
Performance37 kW @230 V
Frequency 50/60 Hz
Operating voltage200 ... 460
Height 198 mm
Width120 mm
Depth250 mm

Our Repair Services

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.

Repair Benefits

MRO can restore your failed 3RW4055-6BB34 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 3RW4055-6BB34 we also repair a wide range of other Siemens products, so if you don’t see the model you need, please contact us.

Core Exchange

If you are interested in getting credit for your faulty 3RW4055-6BB34, 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.

  • Shipping Weight : 1lb

Want it shipped tomorrow?

  • Order within the next 19 hours and 9 minutes.
  • If you order between 4pm and 6pm EST, you will be charged a small rush fee.

Ask about exchanging your faulty 3RW4055-6BB34 for credit when ordering from MRO Electric

MRO Electric provides a 2-year warranty on every item we sell and repair. We stand behind all of our products and guarantee them for the full 2 years. If there is an issue with any of our products within the warranty period, we will evaluate the unit and repair or replace it under warranty.

Siemens 3RW4055-6BB34 Overview

Siemens 3RW40556BB34

Siemens is a global innovation leader, offering cutting-edge solutions across various industries. Renowned for its commitment to quality and reliability, Siemens continually pushes the boundaries of technology, ensuring efficiency and sustainability in its products and services.

Product Overview: 

The Siemens Soft Starter, S6, embodies the pinnacle of engineering excellence, providing seamless control and protection for industrial applications. With a rated current of 117 A and the capacity to handle motors up to 75 HP/460 V, this device ensures optimal performance while safeguarding equipment from sudden power surges and voltage fluctuations.

Advanced Functionality: 

Equipped with advanced features, the Siemens Soft Starter facilitates smooth motor acceleration, reducing mechanical stress and extending the lifespan of machinery. Its intelligent design allows for precise adjustment of starting parameters, catering to diverse operational requirements with unparalleled accuracy.

Efficiency and Durability: 

Operating within a wide temperature range of 50 degrees Celsius, the Siemens Soft Starter demonstrates remarkable resilience in challenging environments, ensuring consistent performance under varying conditions. This robust device is crafted from high-quality materials and exemplifies Siemens' unwavering commitment to durability and longevity.

Voltage Compatibility: 

Compatible with voltage inputs ranging from 200-460 V AC, the Siemens Soft Starter offers versatility and adaptability across different power systems, making it suitable for a diverse range of industrial applications. Its 115 V AC control voltage capability also ensures seamless integration with existing control systems, streamlining installation and operation.

Product Type: Sirius: 

As part of Siemens' esteemed Sirius product line, the Soft Starter S6 exemplifies excellence in motor control technology. The Sirius range is synonymous with precision engineering and innovation, delivering unparalleled performance and reliability across various industrial sectors.

Integration and Connectivity: 

Featuring intuitive interfaces and seamless connectivity options, the Siemens Soft Starter integrates effortlessly into existing automation systems, enhancing operational efficiency and enabling remote monitoring and control. With flexible communication protocols, including Ethernet and PROFIBUS, this device facilitates seamless integration into Industry 4.0 environments, enabling predictive maintenance and data-driven decision-making.

Safety and Compliance: 

Adhering to stringent safety standards and regulations, the Siemens Soft Starter prioritizes operator safety and equipment protection, incorporating comprehensive safety features such as motor overload protection and emergency stop functionality. Its compliance with international standards underscores Siemens' commitment to delivering products that meet the highest quality and safety benchmarks.

FAQ: Siemens Soft Starter S6

1. What is a soft starter, and how does it differ from a traditional starter? A soft starter is a device used to ramp up the voltage gradually applied to an electric motor during startup, reducing the mechanical stress and current spikes associated with traditional direct-on-line starters. Unlike traditional starters, which use full voltage immediately, soft starters provide smooth acceleration, prolonging the motor's lifespan and connected equipment.

2. What are the key benefits of using the Siemens Soft Starter S6? The Siemens Soft Starter S6 offers several benefits, including:

  • Reduced mechanical stress on motors and connected machinery
  • Enhanced motor lifespan and reduced maintenance costs
  • Protection against voltage fluctuations and power surges
  • Precise control over motor acceleration and deceleration
  • Seamless integration into existing automation systems
  • Compliance with international safety standards

3. What types of applications is the Siemens Soft Starter S6 suitable for? The Siemens Soft Starter S6 is ideal for various industrial applications, including conveyor systems, pumps, compressors, fans, and machinery requiring controlled motor acceleration. Its versatility and adaptability make it ideal for manufacturing, oil and gas, water treatment, and HVAC industries.

4. How does the Siemens Soft Starter S6 ensure safety and compliance? The Siemens Soft Starter S6 prioritizes safety and compliance by incorporating comprehensive safety features such as motor overload protection, emergency stop functionality, and compliance with international safety standards and regulations. Its robust construction and advanced monitoring capabilities also ensure reliable operation and equipment protection.

5. Can the Siemens Soft Starter S6 be integrated into existing automation systems? It is designed for seamless integration into existing automation systems, offering intuitive interfaces and flexible communication protocols such as Ethernet and PROFIBUS. This enables remote monitoring and control and integration into Industry 4.0 environments for predictive maintenance and data-driven decision-making.

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 Siemens Products

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, we strive for customer satisfaction first. This means lower prices and better service for you. For more products like 3RW4055-6BB34, 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 3RW4055-6BB34 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.

5 stars

4.9 Overall Satisfaction Rating

Over 1700 Ratings from Actual Customers

Read Our Reviews

Very happy with the overall service, delivery, communication and delivery,

Conley Cooke

I needed a special drive, found it, and I was quickly assisted by Joe Kaminski. Everything was exactly as it should be....


We have an older DMU80 CNC Machine and the Handheld Control was damaged beyond repair. MRO was very helpful in confirmin...

Abbey-Purchasing Specialist