Fast Lead Times

Padmount Transformers

The safety and security of tamper-proof padmount transformers make them the ideal for public installations, or with underground cabling.

Thousands of padmounts in stock
Same day quotes
24/7 support
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Liquid filled padmounted transformer

Capabilities

Maddox stocks and builds padmount transformers for projects of any size, customized however you need them. From solar duty and data center designs to standard commercial and industrial units we have the padmounts to get your project powered on.

Maddox padmount transformer with the cabinet doors open

Maddox tamper-proof, compartmentalized, liquid-filled, pad-mounted (or padmount) transformers are all-in-one units designed, built, and tested in accordance with the highest industry standards including NEMA, ANSI C.57, DOE, and IEEE as applicable. They can be customized with over-current protection, and sectionalized switching to give you maximum control over your distribution system.

Product Scope

  • Base Rating: 30 - 10,000 kVA
  • High Voltage: 5kV - 35kV
  • Low Voltage: 208- 15kV

Common Padmount Sizes:

Technical Specs

Maddox stocks and builds padmount transformers for projects of any size, customized however you need them. From solar duty and data center designs to standard commercial and industrial units we have the padmounts to get your project powered on.

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 Features

  • 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

Maddox Advantage

Padmounts. In Stock Ready. To Ship.

Maddox stocks thousands of new and remanufactured padmount transformers in yards across the United States. If we don’t have what you need in stock, we can manufacture it for you with the shortest lead-times in the industry.

Speed

Maddox has the fastest lead times for transformers in the industry. We also pride ourselves on fast clear communication for our customers.

Capacity

With over 4,000 new padmount slots each year and thousands in stock across the U.S., we’re ready to power your project—no matter the size.

Quality

Based in South Carolina, with locations across the United States, we stand behind our padmounts with an industry leading 3-year warranty.

Same Day Quotes

Power you next project on with a Maddox padmount.
Fill out the form below to get a padmount quote.

Get a Quote

Transformer Ordering Made Easy

01
Request a Quote

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

02
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.

03
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.

Projects Powered by Maddox Padmounts

Don’t just listen to us. Take it from our customers and their 800+ 5 Star Reviews.

I purchased a Transformer from Maddox. They explained everything to me about what I needed. It was in stock. They arranged the shipping and was delivered to my customer right away. The service was prompt and professional.

Scott Hotsinpiller

Get a Same Day Padmount Quote

Fill out the form and we will get back to you as soon as possible. Our average response time during business hours is 30 minutes.

Frequently Asked Questions

Average Lead Time

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Warranty

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Dimensions & Weights

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Shipping

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Maintenance

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New vs Remanufactured

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Replacing Old Padmounts

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Custom Requirements

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