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Siemens 6SE6440-2UD21-1AA1

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Part Number6SE6440-2UD21-1AA1
TypeAC Drives
Model #6SE64402UD211AA1
Warranty2 Year
Input Phase3-Phase AC
Cooling Fan
Operation ambient temp-10 ... 50 °C
Line voltage input380 ... 480 V ±10 %
Input line frequency47 ... 63 Hz
Rated input current4.90 A
Power factor λ0.95
Efficiency η0.96
Phase out3-Phase AC
Output frequency for V/f control0 ... 650 Hz
Rated out voltage480 V
Rated hp out1.10 kW / 1.50 hp
Rated out current3.10 A
Output pulse frequency 4000 Hz
ProtectionIP20/ UL open
Digital inputs6
Relay out3
Analog in/out2 in/2 out

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 6SE6440-2UD21-1AA1 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 6SE6440-2UD21-1AA1 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 6SE6440-2UD21-1AA1, 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 6SE6440-2UD21-1AA1 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 6SE6440-2UD21-1AA1 Overview

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 AC Drives from other manufacturers such as FANUC and Yaskawa.

The 6SE64402UD211AA1 is an advanced MICROMASTER 440 frequency inverter, a powerful drive solution manufactured by Siemens. This versatile and efficient drive is designed to offer precise motor control for various industrial applications, providing reliable performance and energy-saving capabilities.

Rated Data and Performance: 

The MICROMASTER 440 is rated with a power output of 1.10 kW (approximately 1.50 horsepower) and operates at a rated voltage of 480 V. With a frequency range of 47 to 63 Hz, this drive can handle a wide variety of motor speeds. The rated current for the High Overload (HO) mode is 4.90 A, and it can handle 150% output current for 60 seconds, followed by 100% output current for 240 seconds in a 300-second cycle time. These overload capabilities make the MICROMASTER 440 suitable for applications that experience intermittent high-load demands.

Ambient Conditions and Cooling: 

The MICROMASTER 440 is designed to operate in harsh environmental conditions, with an ambient temperature range from -40°C to 70°C during storage and transport. During operation, it can handle an ambient temperature range from -10°C to 50°C when operating in the High Overload mode. The drive utilizes fan cooling for efficient heat dissipation, ensuring stable operation even under heavy loads.

Input and Output Specifications: 

The input of the MICROMASTER 440 supports three phases with a line voltage range of 380 to 480 V, operating at a frequency range of 47 to 63 Hz. On the output side, the drive also supports three-phase operation, delivering an output frequency range from 0 to 650 Hz. The drive's high efficiency of 96% (η 0.96) contributes to energy savings during operation.

Mechanical Specifications: 

The MICROMASTER 440 has compact dimensions, with a height of 149.0 mm, a width of 173.0 mm, and a depth of 73.0 mm. Its net weight of 1.30 kg ensures easy handling and installation. The drive's degree of protection is rated as IP20, providing protection against solid objects but not against moisture or liquids.

Connectivity and Control: 

This frequency inverter is equipped with several digital inputs and outputs, making it highly versatile for various control applications. It has three standard digital inputs, six inputs/outputs, two relay outputs, and two analog inputs. Additionally, it offers one PTC/KTY interface for temperature sensing and monitoring.

Efficiency and Energy Savings: 

The MICROMASTER 440 is designed with energy efficiency in mind, achieving a high efficiency of 96%. This ensures minimal energy loss during operation, leading to reduced energy consumption and lower operational costs. The drive's energy-saving capabilities make it an environmentally friendly and cost-effective choice for industrial applications.


The MICROMASTER 440 is a suitable drive solution for a wide range of industrial applications. From pumps, fans, and conveyors to mixers, crushers, and other heavy machinery, this frequency inverter provides precise motor control and reliable performance in diverse industrial settings.


In conclusion, the 6SE64402UD211AA1 MICROMASTER 440 frequency inverter is a robust and efficient drive solution manufactured by Siemens. Its rated data, high overload capability, and wide ambient temperature range make it suitable for demanding industrial applications. With its compact design, energy efficiency, and versatile connectivity options, the MICROMASTER 440 provides precise motor control and reliable performance, contributing to increased productivity and energy savings in industrial settings. Whether in manufacturing, automation, or other industrial applications, this drive proves to be a reliable and valuable asset for optimizing processes and enhancing system performance.

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 6SE6440-2UD21-1AA1, take a look at more from our AC Drives 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 6SE6440-2UD21-1AA1 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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I needed a special drive, found it, and I was quickly assisted by Joe Kaminski. Everything was exactly as it should be....


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