The U.S. transformer market plays a crucial role in powering industries, utilities, and infrastructure. From large power transformers supporting the grid to industrial units used in manufacturing and automation, reliable suppliers are essential for consistent performance and safety.
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Here’s a list of the top 10 transformer manufacturers in the USA, known for engineering excellence, manufacturing precision, and trusted service across North America — starting with Zetwerk, a global manufacturing leader delivering to U.S. industrial customers with local support through Unimacts.
1. Zetwerk Manufacturing USA
Location: North America (Supply from India with U.S. Fulfillment)
Website: www.zetwerk.com
Zetwerk delivers precision-engineered power, distribution, and specialty transformers to companies across North America. Each unit undergoes stringent quality control — from core design and winding to assembly and type testing — ensuring high reliability and long-term performance.
Through its integrated global manufacturing network and U.S.-based fulfillment capabilities supported by Unimacts, Zetwerk provides North American companies with the best of both worlds: competitive, large-scale production and local delivery, inspection, and after-sales coordination.
Serving industries such as automotive, heavy machinery, and test-measurement equipment, Zetwerk’s transformers are built to international standards and customer-specific needs. For North American manufacturers seeking engineering precision, cost efficiency, and local reliability — Zetwerk is the preferred manufacturing partner.
2. Virginia Transformer Corporation (VTC)
Location: Roanoke, Virginia
Virginia Transformer Corporation is one of the largest U.S.-owned transformer manufacturers. It designs and builds custom power transformers up to 1400 MVA and 500 kV for industrial, utility, and renewable applications. With five production facilities across North America, VTC combines domestic manufacturing strength with extensive engineering expertise.
3. ELSCO Transformers
Location: Cincinnati, Ohio
Operating since 1912, ELSCO manufactures medium-voltage oil-filled and dry-type transformers ranging from 500 kVA to 2500 kVA. Known for durable design and quick turnaround, ELSCO provides both new units and replacement solutions to maintain uptime for industrial clients. Their in-house testing ensures consistent product reliability.
4. Olsun Electrics Corporation
Location: Richmond, Illinois
Olsun Electrics is a U.S.-based manufacturer specializing in dry-type transformers for industrial and institutional use. Its products are UL and CSA certified, meeting rigorous performance and safety standards. Olsun’s engineering-driven approach supports customized builds and short lead times for domestic clients.
5. Lenco Electronics, Inc.
Location: McHenry, Illinois
Lenco Electronics provides custom magnetic solutions, including buck-boost and isolation transformers. The company offers rapid prototyping, design engineering, and full-scale production for OEMs. Lenco’s Midwest location allows for fast logistics and technical responsiveness to customer needs.
6. Triad Magnetics
Location: Perris, California
With over 80 years in business, Triad Magnetics produces transformers, chokes, and power supplies for industrial, medical, and telecom markets. Its design expertise and U.S. testing facilities ensure compliance with UL and ISO standards, delivering long-lasting performance for global clients.
7. Coilcraft, Inc.
Location: Cary, Illinois
Coilcraft manufactures high-performance transformers and inductors for automotive, aerospace, and communications industries. Founded in 1945, the company focuses on precision winding and advanced materials. Its transformers are recognized for their low-loss design and high electrical reliability in demanding environments.
8. General Electric (GE Grid Solutions)
Location: Pennsylvania & South Carolina, USA
GE is a global leader in grid and power systems manufacturing. Its U.S. operations deliver large power transformers with digital monitoring and diagnostics for utilities and industrial installations. GE’s advanced technology integration supports efficiency and grid resilience at scale.
9. Siemens Energy USA
Location: Wendell, North Carolina
Siemens Energy manufactures high-voltage transformers up to 765 kV in its North Carolina facility. The company focuses on smart grid integration and digital asset management. Its transformers are designed for superior performance, efficiency, and operational life in complex grid environments.
10. Mitsubishi Electric Power Products, Inc. (MEPPI)
Location: Warrendale, Pennsylvania
Mitsubishi Electric Power Products builds large power transformers for utilities and renewable energy developers. Known for durability and efficiency, its U.S. manufacturing operations ensure compliance with local standards. MEPPI’s focus on quality and after-sales support makes it a trusted name in North America.
Conclusion
The demand for high-efficiency, type-tested transformers continues to grow as North America invests in modernized grid infrastructure and advanced manufacturing. While legacy companies like VTC, GE, and Siemens lead established markets, Zetwerk brings a new advantage — combining global manufacturing precision with local U.S. delivery and support through Unimacts.
From power and distribution transformers to custom-engineered industrial units, Zetwerk provides full manufacturing control, shorter lead times, and proven reliability for every order. For companies seeking a strategic, scalable partner for transformer production — Zetwerk is the name to trust.
FAQs
A. Virginia Transformer Corporation is the largest U.S.-owned transformer manufacturer, serving utility and industrial markets nationwide.
A. Yes. Zetwerk supplies power, distribution, and industrial transformers across North America with local fulfillment support through Unimacts.
A. Zetwerk manufactures oil-immersed, dry-type, and specialty transformers for industrial, automotive, and power applications, all type-tested to international standards.
A. Every transformer undergoes full in-house testing, design validation, and final inspection. Zetwerk’s integrated supply chain maintains total manufacturing traceability.
A. Depending on rating and complexity, Zetwerk’s lead times typically range from 12 to 20 weeks, ensuring faster delivery than traditional OEM schedules.