Year established


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Company Overview


Maddox Industrial Transformer provides a full range of commercial- and industrial-grade transformers. With thousands of new and reconditioned units in stock, our transformers are ready to ship at a moment's notice. And if we don't have what you need in stock, we can manufacture it for you with the shortest lead-times in the industry. We also offer transformer rentals, perform maintenance and repair work, and buy surplus units.


  1. Rent a Transformer - Need temporary power? Maddox Transformer's liquid-filled rental unit substation transformers are the perfect fit for your temporary power needs!

  2. Transformer Repair & Field Service - Our highly skilled team is outfitted with the latest, state-of-the-art test and fabrication equipment, to inspect, test, and repair your transformer to ensure that it is in top working condition.

Year Established


Office address

865 Victor Hill Rd, Greer, South Carolina 29651, US

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Team Members

Camden Spiller


Battle Ground, Washington, United States

Tracey Clakley


Greater Houston

Joseph Sturtevant


Portland, Oregon Metropolitan Area

Benjamin Gulick

Training Coordinator

Woodruff, South Carolina, United States

Mark Arterburn

Production Coordinator

Greer, South Carolina, United States

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Main Products

SubStation Transformer

Oil Filled - kVA range: 300 kVA - 25,000 kVA base - Voltage range: Up to 69,000v

Padmount Transformer

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

Pad-mounted Switchgear

Switchgear 15 kV double-door design Up to 4 bays Multiple switch and fuse configurations available

Medium Voltage Dry-Type Transformer

Dry-type Maddox medium voltage dry-types are designed, built, and tested in accordance with the highest industry standards including NEMA, ANSI C.57, DOE, and IEEE as applicable. - 300 kVA - 5,000 kVA - Up to 35,000v

Metal-enclosed Switchgear

Switchgear 5/15 kV General purpose switches Current-limiting clip-lock fusing options (up to 600E for 5 kV applications and up to 300E for 15 kV applications)

General Purpose Low Voltage Transformer

Dry-type Air-cooled low voltage transformers are ideal for power distribution below 600v kVA range: 5 kVA - 1,000 kVA Voltage range: Up to 800v