Don’t Send Your Technicians Out There.

There’s A Better Way.

Ditch the trips with our low-maintenance NEMA 3R enclosure for any VFD brand.

Do your technicians have to travel to remote areas servicing the AC units keeping your variable frequency drives (VFD) cool in your NEMA 3R enclosures? What if your enclosure didn’t need an AC unit? The Cates CoolDrive UL 508A/NEMA 3R Enclosure was specifically designed to dissipate heat and keep your drives cool without an air conditioner. CoolDrive 3R is affordable, can be configured with any brand that has a flange-mount drive, supports multiple door options, and offers quick delivery to get you up and running fast.

Meet the CoolDrive NEMA 3R/UL 508A Enclosure

Unique NEMA 3R Cabinet Design

  • Simple. Dissipates heat and cools VFDs without an air conditioner
  • Flexible. Configure with any brand offering a flange-mount VFD
  • Customized. Add a fault pilot light, bypass selector switch, or e-stop push button
  • Certified. NEMA 3R and UL 508A certified outdoor enclosure
  • Fast. Standard cabinet ships within 1 week for in-stock drives
  • Affordable. Competitively priced vented outdoor enclosure


Oil and Gas

  • Progressive Cavity Pumps (PCP)
  • Electric Submersible Pumps (ESP)
  • Rod Pumps (RPC)


  • Center pivots
  • Turf irrigation


Agriculture pumping

Single phase conversion

Standard Cabinet

  • 2 Sizes:
    36″ x 60″ 5HP – 150HP 460V
    42″ x 60″ +150HP 460V
  • 3 Phase
  • Can accommodate any brand with a flange-mount drive
  • Delivery: For in-stock drives, cabinets ship within 1 week of order date

Custom Cabinet

For custom applications, we can design an enclosure to fit your specifications.
Single-phase solutions are available.

  • Multiple drives
  • PLC control
  • Communication protocols
  • Drive bypass
  • Delivery: Ships within 2 weeks after design approval and receipt of parts

Cabinets are designed and assembled in the United States in compliance with UL 508A

All the Features You Need Included in One Package

Standard Features on All Cates Cabinets

  • Outdoor rated, NEMA 3R/UL certified enclosure
  • Protection against rain, sleet, snow, and external ice formation
  • Seperate drive/control and cooling/air flow sections enhance reliability
  • Can accommodate any brand flange-mount drive
  • Padlockable disconnect and enclosure doors
  • Ambient temperature -4 to 104° F to 122 ° F with derate
  • Condensation heater if required
  • Wall mounter or floor kit
  • Hand/Off/Auto selector switch
  • Speed Potentiometer
  • Upgraded control transformer for extra 100VA for customer use
  • Can be lifted with a forklift
  • 5HP – 300HP *elevation affects drive rating
  • Constant Torque
  • High visibility beacon to indicate system status
  • Door-mounted keypad


Please contact us for pricing information

Talk To Our Experts

Information Request

Email us your NEMA 3R enclosure questions.


Call us today to discuss your 3R cabinet requirements.