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2-year Warranty

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Schneider Electric ATV21HD37N4

VARIABLE SPEED DRIVE ATV212 - 37KW - 50HP - 480V - 3PH - EMC - IP21


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2 Year warranty

Part NumberATV21HD37N4
ManufacturerSchneider Electric
TypeAC Drives
Warranty2 Year
CategoryVariable Speed Drive
EMC filterClass A EMC filter integrated
ApplicationPumps and fans in HVAC
ProtectionIP20 on upper part without blanking plate on cover EN/IEC 60529 IP20 on upper part without blanking plate on cover EN/IEC 61800-5-1 IP21 EN/IEC 60529 IP21 EN/IEC 61800-5-1 IP41 on upper part EN/IEC 60529 IP41 on upper part EN/IEC 61800-5-1
DestinationAsynchronous motors
Power supply380...480 V - 15...10 %
Line current54.4 A 480 V 68.9 A 380 V
Motor power37 kW
Speed range1…10
Max hp rating50 hp
Transient overtorque120 % of nominal motor torque +/- 10 % 60 s
Frequency50...60 Hz - 5...5 %
Max ouput79 A 380 V, 79 A 460 V
Switching frequency6...16 kHz adjustable 8...16 kHz with derating factor
Regulation loopAdjustable PI regulator
Analog in/out2 input/1 out
Discrete out2 out
Connector Type1 RJ45
Interface2-wire RS 485

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 ATV21HD37N4 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 ATV21HD37N4 we also repair drives, motors, PLCs and more, 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 ATV21HD37N4, 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 ATV21HD37N4 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.

Schneider Electric ATV21HD37N4 Overview

Schneider Electric ATV21HD37N4 

The ATV21HD37N4 is a versatile variable speed drive (VSD) designed to efficiently control asynchronous motors, specifically for applications involving pumps and fans in Heating, Ventilation, and Air Conditioning (HVAC) systems. With a power range of 37 kW (50 HP) and a power supply voltage of 380-480V, this drive is well-suited for a wide range of industrial and commercial settings.


The ATV21HD37N4 is part of the Altivar 21 range of products and offers several features tailored to optimize motor control and energy efficiency. The drive supports a speed range of 1 to 10, allowing precise control over motor speed for various operational requirements. It employs a quadratic voltage/frequency ratio control profile and offers constant voltage/frequency ratios with automatic IR compensation, ensuring efficient and accurate control over motor operation.

The drive incorporates an EMC filter of Class A, ensuring electromagnetic compatibility and minimizing electromagnetic interference in sensitive environments. It adheres to protection standards with an IP20 degree of protection, guarding against solid object ingress, and offering robust protection for industrial settings.


For communication and control, the drive includes various communication port options such as Modbus, allowing seamless integration into automation systems. It also offers multiple options for communication cards like APOGEE FLN, BACnet, LonWorks, and METASYS N2, further enhancing its connectivity and interoperability.

Control and Energy Efficiency

Efficient energy usage is a key focus of the ATV21HD37N4. It employs energy-saving features such as Current Flux Vector Control (FVC) without speed feedback, which helps optimize energy consumption while maintaining motor performance. The drive's speed accuracy of +/- 10% of nominal slip and torque accuracy of +/- 15% contribute to its ability to deliver precise control and energy efficiency.


The ATV21HD37N4 prioritizes safety and protection. It offers comprehensive protection mechanisms, including measures against input phase loss, line supply overvoltage and undervoltage, overcurrent between output phases and earth, overheating, overvoltages on the DC bus, short circuits between motor phases, and more. These safeguards ensure both equipment and personnel safety during operation.


Installation and maintenance are made convenient with various features. The drive's display unit allows monitoring and configuration of operational parameters, and the device offers multiple analog and discrete inputs and outputs, making it adaptable to different control systems and sensors.

Physically, the drive is designed for easy integration into industrial setups. Its compact dimensions (21.65 in x 9.45 in x 4.45 in) allow it to fit into tight spaces, and it can be positioned with a vertical tolerance of +/- 10 degrees.


Environmental considerations are also a focus. The drive's vibration and shock resistance, as well as its resistance to varying humidity and temperature levels, make it suitable for challenging operating conditions. It conforms to international standards and certifications, including UL, CSA, and C-tick.

In conclusion, the ATV21HD37N4 is a robust and efficient variable-speed drive catering to the specific needs of asynchronous motor control in HVAC applications. With its precise control, energy-saving features, comprehensive protection mechanisms, and adherence to industry standards, it is a reliable choice for optimizing motor performance while ensuring operational safety and longevity. Its compact design, communication capabilities, and environmental resilience further enhance its suitability for a wide range of industrial and commercial settings.

Contact Us Today For More Information About Schneider Electric Products

Check out the rest of our Schneider Electric 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 ATV21HD37N4, 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 ATV21HD37N4 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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