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Capabilities
Maddox stocks and supplies 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 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 supplies padmount transformers built 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.
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
- Vacuum Interrupters
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 have it built for you with the shortest lead-times in the industry.
Speed
Maddox has the fastest lead times for padmount transformers in the industry. We also pride ourselves on fast clear communication for our customers.
Capacity
With over 4,000 new padmount manufacturing 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.
Don’t just listen to us.
Take it from our customers and their 800+ 5 Star Reviews.
Frequently Asked Questions
Lead Time
What is the average lead time for a Maddox padmount transformer?
Maddox offers industry-best lead times. We stock units for same-day deliveries, remanufacture in 4–6 weeks, and can provide built-to-order new padmounts in under 20 weeks. Request a quote here for spec-specific lead times.
Warranty
What is Maddox’s standard warranty for padmount transformers?
Maddox offers the industry’s best warranty for padmount transformers, covering new and remanufactured units for 3 years (with a 5 year option available). Find Maddox’s full padmount warranty here.
American Made
Are Maddox padmount transformers BABA compliant?
Many Maddox products are made in the USA, but not all. Our goal is to provide the majority of our products domestically, while leveraging global supply as needed. We specify “American Made” on our quotes when applicable. Maddox can also provide padmounts to meet “Build America, Buy America” requirements. Ask for BABA in your quote and learn more about BABA here.
Rentals
Can I rent a padmount transformer from Maddox?
Yes, you can rent a padmount from Maddox for temporary power. Find rental options here.
Remanufactured vs New
Does Maddox sell remanufactured padmount transformers?
Yes, Maddox sells both new and remanufactured padmounts. Learn more about remanufactured padmounts here.
Customizations
Can Maddox supply a custom padmount transformer to meet my spec?
Yes, Maddox can supply custom padmount transformers to spec, with the fastest lead times in the industry. Request a quote here to get pricing and lead times.
Dimensions & Weights
What are the dimensions and weights of Maddox’s padmount transformers?
Specific dimensions for Maddox padmount transformers vary by unit. Request a quote here to receive spec-specific dimensions.
Shipping
How is shipping arranged for Maddox’s padmount transformers?
Maddox ships padmount transformers anywhere in North America, handling all logistics at no additional charge. Request a quote here to get pricing and lead times.
Rewinds
Can Maddox rewind my padmount transformer?
Yes, Maddox can rewind your padmount transformer. Request a rewind here.
kVA Rating
What kVA sizes does Maddox offer for padmount transformers?
Maddox sells padmount transformers with base kVA ratings ranging from 30 to 10,000 kVA. Learn how to size your transformer here.
