Founded in Albany, New York, in 1909, Dongan Electric Manufacturing Company is a long-established Detroit-area manufacturer with roots in the early automotive trade. After beginning as the Dongan Electric Instrument Company, it evolved into a maker of transformers and inductors, serving OEMs and end users worldwide with standard and custom-engineered power equipment.
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Darrah Electric CompanyA third-generation, family-owned business founded in 1960, Darrah Electric Company remains rooted in Cleveland-area manufacturing. It builds custom D.C. power supplies for industrial and OEM customers while drawing on more than a century of combined engineering experience to support demanding power-conversion projects.CHESTERLAND, OH
Foster Transformer CompanyBorn from Arnot Foster’s spare-bedroom enterprise, Foster Transformer Company has been a Cincinnati manufacturer since 1937. Its Northside operation is known for custom transformer work, with in-house tooling that helps the company move quickly on new programs and lower-volume production for equipment makers. Foster also supports larger production runs through its facility in Dongguan, China.CINCINNATI, OH
Niagara Power TransformerFounded in 1924 as Erie Electric Corp., Buffalo-based Niagara Power Transformer manufactures liquid-filled power and special-application transformers for demanding conditions. The company has produced more than 75,000 transformers, serves customers in over 80 countries, and has expanded its production and engineering facilities with major investments in testing and winding capabilities. Now part of the Quanta Services family, Niagara marks its second century with ISO 9001:2015 certification and a focus on engineered-to-order power solutions.BUFFALO, NY
Staco Energy Products CompanySince manufacturing its first variable transformer in Dayton in 1937, Staco Energy Products Company has built power-quality and voltage-control equipment for critical electrical applications. The Miamisburg, Ohio manufacturer is described as the oldest and largest U.S. maker of variable transformers, and it continues to support equipment made as far back as 30 years ago. Staco also provides factory-trained service, including start-up, maintenance and repair support, for both current and legacy systems.MIAMISBURG, OH