A variable frequency drive (VFD), also called an AC drive or inverter drive, controls the speed and torque of an AC motor by varying the frequency and voltage supplied to it. When a drive fails on a production line, the line stops. MT.parts keeps 600+ VFDs in stock from the leading industrial brands, including units that are discontinued or no longer sold by the manufacturer.
Where these drives are used
- Conveyors and material handling, for controlled acceleration and soft stops.
- Pumps and fans, where speed control replaces throttling and cuts energy use.
- Packaging and bottling lines, where several drives run in sync with a PLC.
- Machine tools and CNC auxiliaries, driving spindles, coolant and chip conveyors.
- HVAC and building systems, typically ACH-series and similar dedicated drives.
- Food and beverage, automotive and metalworking plants, in mixed-brand installations.
How to choose a replacement VFD
Matching a drive is not only about horsepower. Check these before ordering:
- Part number first. The exact code on the nameplate is the safest match. Search it in our catalog.
- Supply voltage and phase, for example 240 V single-phase versus 380 to 480 V three-phase.
- Output current in amps, not just kW or HP. Two drives with the same rating can differ in current.
- Enclosure rating, panel-mounted IP20 versus washdown or outdoor-rated units.
- Communication protocol, such as EtherNet/IP, PROFINET, PROFIBUS, Modbus or DeviceNet, so the drive still talks to the existing PLC.
- Options and I/O cards, including built-in filters, brake choppers and keypads. Suffixes in the part number usually indicate them.
If you are unsure which code replaces yours, send us the nameplate data and our team identifies the correct unit.
New, refurbished and obsolete drives
We supply three conditions, and the condition is always stated on the product page. New units are factory-sealed. Refurbished units are inspected, repaired where needed and functionally tested before shipping. Obsolete and hard-to-find drives are models the manufacturer has discontinued, which is often the only way to keep an older line running without a full retrofit. Every drive we ship carries a 12-month warranty.
VFD brands and series we stock
- Allen-Bradley: PowerFlex 4, PowerFlex 40, PowerFlex 525
- Siemens: SINAMICS G120C, MICROMASTER 420, MICROMASTER 440
- ABB: ACS150, ACS355, ACS380, ACS550, ACH550, ACH580
- Schneider Electric: Altivar ATV12, ATV312, ATV320, ATV71, ATV630
- Mitsubishi Electric: FREQROL D700, E700, E800, A800, F800
- Yaskawa: J1000, V1000, A1000, U1000
- Omron: MX2
Frequently asked questions
What is the difference between a VFD and a servo drive?
A VFD controls the speed of a standard AC induction motor with open-loop or light closed-loop control. A servo drive controls position, speed and torque of a servo motor with closed-loop feedback and far higher precision. Use a VFD for pumps, fans and conveyors; use a servo drive for indexing, positioning and synchronized motion.
Can I replace a discontinued VFD with a newer model?
Often yes, but the mounting footprint, control wiring and communication card may differ, which means panel and program changes. Replacing with the same discontinued part number keeps the line running with no retrofit. We stock obsolete drives for exactly that reason.
Do refurbished VFDs come with a warranty?
Yes. New, refurbished and obsolete drives all ship with a 12-month warranty.
How fast can I get a quote?
We reply to quote requests within 24 hours, including part identification when you only have nameplate data.
Do you ship internationally?
Yes. We ship worldwide, including to plants outside the United States.
Can't find your part number?
If the drive you need is not listed, we source it. Send us the manufacturer, part number and quantity, and our team locates the unit, including discontinued models. Request a quote.
