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Pad mounted transformer manufacturers
The distinction that matters is not who is biggest, it is whether a company holds inventory or sells you a production slot. That one fact decides whether your unit arrives next week or next year.
172 companies hold a UL listing to build liquid-filled pad-mounted transformers for the US market. 39 of them are US manufacturers and 71 are in China.
Padmount Supply, 24 September 2026. Free to cite with a link.
Stocking distributors
Manufacturers
Virginia Transformer
Virginia Transformer Corp
ERMCO
ERMCO
Central Moloney
Central Moloney
Prolec GE
Prolec GE
Hammond Power Solutions
Hammond Power Solutions
Howard Industries
Howard Industries
GE
GE Transformer
MGM Transformer
MGM Transformer Company
Vantran
Vantran Industries
Niagara Transformer
Niagara Transformer
Jefferson Electric
Jefferson Electric
Federal Pacific
Federal Pacific Transformer
Delta Star
Delta Star
CORE Transformers
CORE Transformers
Olsun Electrics
Olsun Electrics
Global OEMs
Why the list is shorter than it looks
A UL listing says a company is permitted to build these. It does not say they will sell you one. Global OEMs rarely quote a distributor for a single 150 kVA unit, and US factories route new accounts through rep firms. The practical supply base is far smaller than 172. The full breakdown