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2-year Warranty

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Siemens 3RW4038-1BB14

SIRIUS SOFT STARTER, S2, 72A, 37KW/400V, 40 DEGR., AC 200-480V, AC/DC 110-230V
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Part Number3RW4038-1BB14
Model #3RW40381BB14
Warranty2 Year
DescriptionSoft starter
FeaturesThyristor, Integrated bypass contact system
FunctionOverload protection
Insulated rated voltage600 V
Power rating37 kW/400 V
Frequency60/60 Hz
Operating current1.15
Height 160 mm
Width55 mm
Depth170 mm
MountingScrew and snap-on
Ambient temp-25 ... +60˚C

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 3RW4038-1BB14 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 3RW4038-1BB14 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 3RW4038-1BB14, 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

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Ask about exchanging your faulty 3RW4038-1BB14 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 3RW4038-1BB14 Overview

Siemens 3RW4038-1BB14 SIRIUS Soft Starter: Power and Precision

Siemens introduces the 3RW4038-1BB14 SIRIUS Soft Starter, a powerhouse engineered for precision control and unparalleled performance. Designed under the esteemed SIRIUS brand, this soft starter is equipped with many features and functions to cater to the diverse needs of industrial applications.

Integrated Bypass Contact System: Seamless Operation

One of the standout features of the 3RW4038-1BB14 is its integrated bypass contact system, ensuring seamless operation and enhanced efficiency. With thyristors embedded within, this soft starter guarantees reliability and durability in every operation.

Comprehensive Device Protection: Prioritizing Safety

Safety is paramount, and the 3RW4038-1BB14 ensures intrinsic device protection and motor overload protection. This soft starter offers external reset functionality and adjustable current limitations, empowering users to customize settings for optimal performance.

Efficient Performance: Powering Through

Engineered to deliver exceptional performance, the 3RW4038-1BB14 soft starter boasts impressive operational currents, yielding mechanical prowess for 3-phase motors across various voltage ranges. From 230V to 480V, this device ensures smooth and efficient operation, even in demanding conditions.

Flexible Control Circuit: Adaptable and Versatile

Flexibility is critical, and the 3RW4038-1BB14 soft starter delivers with its adaptable control circuit. Supporting both AC and DC supply voltages and offering adjustable frequency ranges, this device easily adapts to diverse control requirements.

Robust Mechanical Design: Built to Last

Durability meets innovation with the robust mechanical design of the 3RW4038-1BB14. With a compact S2 size and secure screw and snap-on mounting, this soft starter fits seamlessly into any industrial environment, ensuring reliable performance in any setting.

Advanced Connectivity: Streamlined Integration

Connectivity is simplified with the 3RW4038-1BB14's versatile terminal options. From screw-type terminals for main and auxiliary circuits to a range of connectable conductor cross-sections, this device facilitates easy installation and integration, minimizing downtime and maximizing productivity.

Rugged Ambient Conditions: Thriving in Tough Environments

The 3RW4038-1BB14 thrives in tough ambient conditions from extreme temperatures to high altitudes. With an IP20 front protection rating and adherence to stringent environmental standards, this soft starter is built to withstand the harshest industrial environments with ease.

Frequently Asked Questions (FAQ) about Siemens 3RW4038-1BB14 SIRIUS Soft Starter:

Q: Can the Siemens 3RW4038-1BB14 SIRIUS Soft Starter handle different voltage and frequency ranges? A: Yes, the soft starter supports operating voltages ranging from 200V to 480V AC and frequencies between 50Hz to 60Hz, providing versatility for various industrial applications.

Q: What are the key safety features of the Siemens 3RW4038-1BB14 SIRIUS Soft Starter? A: The soft starter includes intrinsic device protection and motor overload protection, ensuring safe and reliable operation. It also offers external reset functionality and adjustable current limitation for enhanced safety customization.

Q: Is the Siemens 3RW4038-1BB14 SIRIUS Soft Starter suitable for use in harsh environments? A: Yes, the soft starter is designed to withstand tough ambient conditions, with an operating temperature range from -25°C to +60°C, and it complies with stringent environmental standards to ensure reliability in industrial settings.

Q: What certifications and approvals does the Siemens 3RW4038-1BB14 SIRIUS Soft Starter have? A: The soft starter holds various certifications and approvals, including UL/CSA ratings, marine/shipping certifications, and compliance with industry standards such as EMC and hazardous locations.

Q: What types of motors can the Siemens 3RW4038-1BB14 SIRIUS Soft Starter control? A: The soft starter is compatible with 3-phase AC motors across a range of power ratings, making it suitable for a wide variety of industrial applications.

Q: How easy is it to install and integrate the Siemens 3RW4038-1BB14 SIRIUS Soft Starter into existing systems? A: The soft starter features versatile terminal options and a compact design for easy installation. It also offers a range of connectable conductor cross-sections, simplifying integration into existing systems and minimizing downtime.

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 3RW4038-1BB14, 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 3RW4038-1BB14 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.

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