Motor Control Solutions for Industrial and Material Handling Equipment

Our name, PE®or Power Electronics® International, Inc.® is synonymous with quality, heavy-duty VFDs and motor control equipment.

Includes Ultra™ Features! For use in hoisting applications (w/ a mechanical load brake) up to 3 HP at 575V (4.7 A max). (Replaces MMX357H models).

Select Product Options


Amazing new Ultra™ Features:

  • PE® SAM™ Anti-Sway Control (built-in/unlockable option)
  • EASY PLC Communication via optically isolated Ethernet port. Ethernet/IP™, Modbus TCP/IP, and other protocols available.
  • PE® Smart-Set. Upload/download settings in a snap using only a flash drive – no PC needed!
  • Plus many more! See the “Support and Downloads” area on this page for a downloadable brochure.
Weight 6.5 lbs
Dimensions 9.33 × 6.38 × 5.76 in
Product Type

Variable Frequency Drive

Model Series

Micro-Speed® MX-Ultra™

Line Voltage

575 VAC

Max HP (kW) @ 575VAC

3 HP (2.2 kW)

Max Amps (FLA)

4.7 A

Motor Motion Type

Hoisting / Lifting WITH a mechanical load brake (or locking wormgear)

Motor Control Type

Open-loop, variable speed control

Speed Controls

Five distinct, adjustable speed inputs (+4 programmable aux inputs); numerous available control modes including infinitely variable. Also includes two (ea.) analog inputs and outputs.

Control Voltage (select one)

110V (standard), 24V, Other voltage (specify)

Temperature Rating

Ambient: 14°F to 140°F (-10°C to +60°C) standard. Best in Class! Storage: From -4°F to +158°F (-20°C to +70 °C)

External Regen. Resistor Required?

No. Internal dynamic braking regen resistors are built-in (CMAA class D – standard)

Frame Size

a2-Ultra, See "Support and Downloads" area for a downloadable dimensional file

Previous Version / Replaces Model(s)**

(Frame size reduced), MMX357H, or this same model with a "-XX" suffix (select control voltage option above to match)

Would you like this product installed in an electrical enclosure or control panel?

Do you have a no-load-brake style hoist? Use the comparable MV-Ultra™ (Closed-Loop) model instead.

Don’t need the HOIST version of this unit? View the traverse MX-Ultra™ models.

Would your application benefit from remote (including wireless) programming and/or data logging capabilities? Or will your project have several Ultra™ VFDs that you would like to control with just one interface?

If you are interested in any (or all!) of these features, let us know when you request your quote and we can provide you with options!

Add heavy-duty conformal coating to provide extra environmental protection for this unit:

**Previous Models / Direct Replacement Information