Transformer Manufacturers in the USA

Allied Components International

Foothill Ranch, California

Allied Components International was founded in 1992 and is headquartered in Foothill Ranch, California. The company began as a designer and manufacturer of custom and standard transformers, later expanding into a broad range of magnetic components.

Custom Coils

Alcester, South Dakota

Custom Coils operates from Alcester, South Dakota, where it was founded in 1967. The company manufactures custom transformers, inductors, and specialty magnetic components for a global customer base.

Electrical Design Technology / General Switchgear

Sacramento, California

Electrical Design Technology, Inc. (EDT) was established in 1984 in Sacramento, California, as a certified Small Business Enterprise focused on power distribution equipment and engineering services.

General Transformer Corporation

Wylie, Texas2-10 employees

General Transformer Corporation was founded in 1976 in Wylie, Texas, where it continues to operate its manufacturing facility. The company has remained a domestic producer of custom magnetics for nearly five decades.

International Coil Inc

South Easton, Massachusetts

The company began as a focused magnetics provider and later expanded into larger facilities in nearby Brockton before settling at its current mailing address in South Easton. Today the firm designs and builds a range of power conversion products, including isolated and non‑isolated DC‑DC converters from 1 W to 150 W, AC‑DC power supplies, and custom transformers and inductors.

MGM Transformers (a Forgent company)

Vernon, California1,500 employees

MGM Transformers, based in Vernon, California, has been designing and building transformers since 1974. The company operates as a subsidiary of Forgent, a platform that brings together over 100 years of experience in power infrastructure.

Pacific Transformer

Anaheim, California

Pacific Transformer was founded in 1981 in Anaheim, California, by three softball teammates who each borrowed $1,300 from their parents to start building transformers in a garage. The company remains founder-owned and headquartered in Anaheim, where it operates a domestic production facility alongside international operations in Mexico, Thailand, and China.

Powell Industries

Houston, Texas1000+ employees

Powell Industries was founded in 1947 by William E. Powell in Houston, Texas, initially as a metal-working shop serving the local petrochemical industry.

Sag Harbor Industries, Inc.

Sag Harbor, New York

Sag Harbor Industries, Inc. was founded in 1946 by Charles Edison, son of inventor Thomas Edison, in Sag Harbor, New York.

Sigma Electronics Inc

Houston, Texas

Sigma Electronics has operated from Houston, Texas for over 45 years as a family-owned business specializing in custom wire-wound magnetics. The company is led by President and CEO Dan Japhet Jr., a Houston resident with a finance and oil-and-gas background who has held the role for 12 years after investing alongside a group of investors and board members.

South Electronics

Dothan, Alabama

South Electronics was established in 2012 in Dothan, Alabama. The company operates an 8,000-square-foot facility at the intersection of Technology Drive and Westgate Parkway.

American Electric Components, Inc.

Vernon, California

American Electric Components, Inc. was founded in 1995 in Vernon, California, as a family-owned and operated business.

Electrical Materials Company has operated from Earlville, Illinois since its founding in 1961. The company also introduced the first secondary service pedestals to the market in its inaugural year.

Elektrisola Inc

Boscawen, New Hampshire

The company focuses on fine enamelled wire, selfbonding wire, Litz wire, and fully insulated wire. The company produces enamelled wire in diameters from 0.008 mm (8 microns) up to 0.50 mm, with custom diameters available to customer specifications.

Houston Transformer Company

Houston, Texas51-200 employees

Founded in 1969 in Houston, Texas, Houston Transformer Company, LTD. has operated as a privately held manufacturer of custom magnetic devices.

Howard Industries

Ellisville, Mississippi

Howard Industries, headquartered in Ellisville, Mississippi, was founded in 1969. The firm is led by principal Peter Howard, who established the company to invest in and support management teams building market-businesses.

JW Electrical Supply

Baltimore, Maryland1-10 employees

JW Electrical Supply operates from Baltimore, Maryland, where it was founded in 1977. Leadership includes President Wajahat Ashai and Head of Marketing and Operations Suhail Kamran, though the original founders are not identified in public materials.

Lectro Components Inc

Bloomingdale, Illinois

Lectro Components Inc was founded in 1974 in Bloomingdale, Illinois. The company has operated as a supplier of HVAC, controls, and electromechanical components for over four decades.

Niagara Power Transformer Corp.

Buffalo, New York

Niagara Power Transformer Corp. traces its roots to 1924, when John H.

Power Plus

Anaheim, California500-999 employees

Power Plus is headquartered in Anaheim, California, and was founded in 1987 by Steve Bray. Bray, a former electrician working on Southern California construction sites, recognized that contractors needed more than equipment—they needed reliable problem-solvers.

VanTran Transformers

Waco, Texas51-200 employees

VanTran Transformers was founded in 1963 in Vandalia, Illinois, and relocated to Waco, Texas in 1974, where it remains headquartered and operates its manufacturing facility. The company is now part of the Forgent power infrastructure group, which combines VanTran with MGM Transformers, States Manufacturing, and PwrQ to deliver end-to-end power solutions.

American Electric Equipment, Inc. (AEEI) and its sister division Control Products, Inc.

Alamo Transformer Supply Company was founded in 1963 in San Antonio, Texas. The company began with a goal to service customers by safely producing quality transformer solutions.

GE Vernova

Cambridge, Massachusetts85,000 employees

GE Vernova, headquartered in Cambridge, Massachusetts, began operations in 2024 as a spin-off from General Electric to focus on the global energy transition. The company carries forward the GE legacy while adopting a new identity—“Ver” for green and “Nova” for new—signaling its commitment to lower-carbon energy.

Hitachi Energy Ltd

Jefferson City, Missouri

Hitachi Energy Ltd operates from Jefferson City, Missouri, drawing on a heritage the company describes as spanning more than a century. The business traces its pioneering spirit to early innovations in power technology, though a specific founding year and founder names are not disclosed in public materials.