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2-year Warranty

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Siemens 6SL3120-1TE21-8AD0

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2 Year warranty

Part Number6SL3120-1TE21-8AD0
TypeAC Drives
Model #6SL31201TE218AD0
Warranty2 Year
Rated DC VoltageDC 510 ... 720 V
Power SupplyDC 24 V -15 % / +20 %
Rated Output18.0 A
Rated pulse frequency4.00 kHz
DC link busbars100 A
DC link capacitance220 µF
Motor End ConnectorConnector (X1)
StandardsCE, cULus
SafetySIL 2 acc. to IEC 61508, PL d acc. to EN ISO 13849-1, Category 3 acc. to EN ISO 13849-1
CoolingInternal air cooling
Ambient temp0 ... 40 °C (32 ... 104 °F)
Cmax cable length230 ft shielded
Height14.96 in
Width1.97 in
Depth10.63 in
Power loss, typ./max. 0.14 kW / 0.19 kW
ProtectionIP20 / UL open type

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 6SL3120-1TE21-8AD0 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 6SL3120-1TE21-8AD0 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 6SL3120-1TE21-8AD0, 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 6SL3120-1TE21-8AD0 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 6SL3120-1TE21-8AD0 Overview

Empowering Efficiency: The Siemens 6SL3120-1TE21-8AD0 AC Drive

Manufacturer: Siemens

Siemens presents the 6SL3120-1TE21-8AD0 AC Drive, a compact yet powerful solution designed to optimize efficiency and performance in industrial applications. With Siemens' reputation for innovation and reliability, this AC drive offers precision control and robust construction to meet the demands of modern manufacturing.

Compact Construction: Booksize Design

The 6SL3120-1TE21-8AD0 features a booksize construction, offering a compact footprint while delivering exceptional performance. This design makes it ideal for applications where space is limited, without compromising on functionality or reliability.

Efficient Power Supply: Rated DC Voltage and Output

With a rated DC voltage range of 510 to 720 volts and a rated output of 18.0 A, the 6SL3120-1TE21-8AD0 ensures stable and reliable power delivery to connected motors. This enables precise control over motor speed and torque, enhancing overall system efficiency.

Advanced Features: Safety and Standards Compliance

The 6SL3120-1TE21-8AD0 meets rigorous safety and standards requirements, including CE, cULus, SIL 2 according to IEC 61508, PL d according to EN ISO 13849-1, and Category 3 according to EN ISO 13849-1. These certifications ensure that the AC drive adheres to the highest safety standards, providing operators with peace of mind and confidence in its performance.

Optimal Cooling: Internal Air Cooling

Equipped with internal air cooling mechanisms, the 6SL3120-1TE21-8AD0 maintains optimal operating temperatures even in demanding environments. This ensures reliable performance and extends the lifespan of critical components, minimizing downtime and maintenance costs.

Effortless Installation: Motor End Connector and Cable Length

Featuring a convenient motor end connector (X1) and supporting a maximum cable length of 230 feet shielded, the 6SL3120-1TE21-8AD0 offers effortless installation and connectivity. This simplifies the integration process, saving time and resources during setup.

Technical Specifications at a Glance

Height: 14.96 inches

Width: 1.97 inches

Depth: 10.63 inches

Power Loss (typical/max): 0.14 kW / 0.19 kW

Protection: IP20 / UL open type


What is the ambient temperature range supported by the 6SL3120-1TE21-8AD0 AC Drive?

The 6SL3120-1TE21-8AD0 is designed to operate within an ambient temperature range of 0 to 40 degrees Celsius (32 to 104 degrees Fahrenheit), making it suitable for use in various industrial environments.

What is the DC link capacitance of the 6SL3120-1TE21-8AD0?

The 6SL3120-1TE21-8AD0 features a DC link capacitance of 220 µF, ensuring stable DC voltage and minimizing ripple for smooth motor operation.

Does the 6SL3120-1TE21-8AD0 support communication protocols for integration into industrial networks?

Yes, the 6SL3120-1TE21-8AD0 supports communication protocols such as CANopen and Modbus, enabling seamless integration into industrial automation systems for enhanced control and monitoring capabilities.

What is the power supply requirement for the 6SL3120-1TE21-8AD0?

The 6SL3120-1TE21-8AD0 requires a DC power supply with a voltage range of 24 volts, with a tolerance of -15% to +20%.

Is the 6SL3120-1TE21-8AD0 suitable for applications requiring high levels of safety compliance?

Yes, the 6SL3120-1TE21-8AD0 is designed to meet stringent safety standards, including SIL 2 according to IEC 61508 and PL d according to EN ISO 13849-1, making it suitable for applications where safety is paramount.

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 6SL3120-1TE21-8AD0, 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 6SL3120-1TE21-8AD0 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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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...

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