Padmount Transformer

The safety and security of tamper-proof padmount transformers make them the ideal choice for installations which may be accessible by the public, or any situation where underground cabling is preferred.

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Green liquid filled padmounted transformer


A maddox green padmount transformer

    Maddox tamper-proof, compartmentalized, liquid-filled, pad-mounted (or padmount for short) transformers are all-in-one units designed, built, and tested to the highest industry standards and can be customized with over-current protection, and sectionalized switching to give you maximum control over your distribution system.

    Product Scope

  • kVA range: 30 kVA - 10,000 kVA
  • Voltage range: Up to 35,000v

Technical Specs

Technical illustration of a standard padmount electrical transformer

Standard specs

  • Type II non-PCB mineral oil (ONAN)
  • High-grade silicon-steel core
  • Aluminum windings
  • Pad-lockable door handle
  • No-load tap changer
  • Impedance 5.75% (±7.5%)
  • Reinforced carbon steel tank
  • Lifting lugs
  • Externally clamped high- and low-voltage bushings
  • Pressure relief valve
  • Pressure vacuum gauge
  • Liquid temp gauge
  • Liquid level gauge
  • Drain and sample valve
  • Schrader valve
  • Ground pads/lugs
  • Nitrogen blanket
  • 65 degree C rise

Optional upgrades

  • Environmentally friendly, high-fire point FR3 oil (KNAN)
  • Copper windings
  • Key interlock provisions
  • Stainless steel tank
  • Gauges with contacts
  • Externally accessible drain and sample valve
  • External gauge package
  • Lid-mounted pressure relief device
  • Sudden pressure relay
  • Lightning arresters
  • Viewing windows in cabinet
  • 55/65 degree C rise
  • Step-up solar and wind duty design
  • Electrostatic shielding
  • K-rated design

Get Started
We make it easy to get a quote and order a transformer. Follow the steps below to get started.

Request a Quote

Call or fill out the form below to get a quote. Most quotes are turned around the same or next-day.

Place your order

Send us a purchase order, or give us a credit card number, and your dedicated customer service rep will send you an order confirmation and answer any questions you may have.

Receive your transformer

We’ll handle all transportation and logistics. Maddox has the shortest lead times in the industry so you can get the power on when you need it.

"We ordered transformers to use for our industrial equipment applications due to market shortages for our standard stepdown transformers. Delivery was incredibly quick and products look and operate without issue. Priced very well in comparison to other outlets - very happy to utilize Maddox in the future for our continued needs."

Todd Griffieth, ops manager

"I have purchased dozens of Maddox transformers, both low voltage dry-types and large reconditioned medium voltage units. Always great service and quality builds, with faster than industry standard lead-times."

Eric Raybould, distributor

"Quick delivery with helpful friendly staff. Great service and highly recommended. A great company to work with on all your transformer needs."

Austin Spiegel, project manager

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Maddox padmount transformers in stock on pallets