Top 10 Encapsulated Transformer Manufacturers in USA

Encapsulated transformers are a cornerstone of modern electrical systems. They are designed to operate in harsh environments, where protection from moisture, dust, or chemicals is essential. By enclosing windings and cores in epoxy resin or similar materials, these transformers offer high durability and safety. Across industrial, commercial, and renewable energy sectors, demand for encapsulated transformers in the United States continues to rise rapidly.

In this article, we will explore the top 10 encapsulated transformer manufacturers in USA, analyzing their expertise, unique features, product offerings, and why they stand out in the electrical manufacturing industry. If you are an engineer, project developer, or procurement manager looking for reliable encapsulated transformer suppliers, this guide will help you make the right choice.

Encapsulated transformers are especially useful in applications such as HVAC systems, renewable energy plants, lighting control panels, offshore oil rigs, and industrial automation. These transformers prevent corrosion, extend lifespan, and maintain stable performance even under high humidity or chemical exposure.

Key Takeaways

• Encapsulated transformers provide protection against environmental damage, moisture, and chemicals.
• Leading encapsulated transformer manufacturers in USA offer UL-listed, high-efficiency, and low-maintenance designs.
• The top manufacturers serve diverse sectors — from heavy industries to renewable energy systems.
• Choosing the right manufacturer ensures reliability, energy efficiency, and long-term performance stability.

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What are Encapsulated Transformers

An encapsulated transformer differs from a standard dry-type transformer in its construction. Instead of open windings, all internal components are sealed within epoxy resin. This prevents dust accumulation, moisture penetration, and insulation degradation.

These transformers are commonly found in outdoor or hazardous environments, where electrical protection is crucial. They come in single-phase and three-phase variants and are available in various ratings — from small control transformers to large industrial distribution units.

Here’s a quick comparison showing the key differences between standard dry-type and encapsulated transformers:

The U.S. market for encapsulated transformers is growing steadily, driven by infrastructure modernization, renewable power installations, and increased industrial automation. Let’s now move to the top encapsulated transformer manufacturers in USA leading this growth.

1. Hammond Power Solutions (HPS)

Hammond Power Solutions (HPS) is among the most recognized encapsulated transformer manufacturers in USA. With over a century of experience, HPS specializes in dry-type and encapsulated distribution transformers designed for demanding environments.

Their HPS Imperator® and Titan® series encapsulated transformers are known for exceptional performance in industrial and commercial installations. These products comply with UL, CSA, and DOE energy efficiency standards.

HPS transformers are ideal for areas with high moisture, vibration, or chemical exposure — such as marine docks, wastewater facilities, and offshore applications.

Key Features:

• NEMA 3R and 4X rated enclosures
• Class H insulation system
• Energy-efficient core designs
• Wide kVA range from 50VA to 1500kVA

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2. Jefferson Electric (A Pioneer in Encapsulated Solutions)

Jefferson Electric has been a trusted name in transformer manufacturing since 1915. Based in Wisconsin, it offers a wide range of encapsulated and ventilated dry type transformers.

The company’s encapsulated series is well-suited for outdoor environments, featuring robust epoxy resin coatings that resist corrosion and mechanical shock.

Jefferson Electric stands out for custom-engineered transformer solutions — tailored to specific voltage, power, and environmental requirements.

Industries Served:

• HVAC and lighting systems
• Manufacturing plants
• Marine installations
• Renewable energy

Jefferson Electric also emphasizes eco-friendly production methods, aligning with modern energy efficiency standards.

3. Schneider Electric USA

Schneider Electric is a global leader in electrical distribution and automation, with a significant presence in the U.S. transformer market. Their encapsulated transformers are widely used in industrial automation and control systems.

The company’s encapsulated control transformers are known for reliability, compact design, and consistent voltage regulation. Schneider’s transformers are UL-listed and tested for high endurance under varying environmental conditions.

Top Products:

• Control Power Transformers (CPT Series)
• Low-voltage encapsulated transformers
• Class 1 Division 2 explosion-proof options

Schneider’s strong focus on digital monitoring and smart grid integration makes it a preferred supplier for modern industrial facilities.

4. Acme Electric (A Hubbell Company)

Acme Electric is a U.S.-based manufacturer with decades of experience in power conversion and distribution. Their encapsulated transformers are designed for high performance in outdoor or industrial applications.

The Acme Electric AE and TB Series encapsulated transformers are built with polyester resin and NEMA 3R enclosures, offering maximum protection from harsh environments.

Key Advantages:

• High dielectric strength
• Energy-efficient laminated core
• UL and CSA certified
• Long operational lifespan

Acme Electric’s strong engineering background and compliance with U.S. energy codes make it a top choice for critical applications in automation and renewable systems.

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5. MGM Transformer Company

MGM Transformer Company, headquartered in California, is among the largest independent encapsulated transformer manufacturers in USA. They produce dry-type, cast resin, and encapsulated transformers from 15kVA up to 20MVA.

Their encapsulated models are specially designed for hazardous and outdoor environments. The company focuses on energy efficiency, low noise, and high mechanical strength.

Notable Features:

• Epoxy encapsulated construction
• Low maintenance design
• High short-circuit withstand capability
• Custom voltage and kVA options

MGM’s local manufacturing allows faster lead times and high customization flexibility for industrial clients.

6. Marcus Transformer Company

Marcus Transformer Company, based in Quebec with operations in the U.S., has been a trusted name since 1942. They specialize in dry-type and encapsulated transformers built for reliability and safety.

Their encapsulated models are available in single and three-phase versions, ranging from 50VA to 1500kVA. These transformers are ideal for commercial and OEM applications.

Core Benefits:

• Epoxy resin encapsulation
• High-efficiency core laminations
• UL and CSA certification
• Custom labeling and wiring options

Marcus transformers are widely used in medical equipment, data centers, and industrial automation systems across North America.

7. ABB (Hitachi Energy)

ABB, now operating as Hitachi Energy, is a global technology leader offering a wide portfolio of power products, including encapsulated transformers.

Their encapsulated units are designed for hazardous and outdoor industrial use, meeting stringent U.S. and international standards.

ABB’s products stand out due to their advanced insulation systems, compact footprint, and low operational losses.

Applications Include:

• Renewable energy systems
• Mining and oil exploration
• Marine and offshore projects
• Control panels and switchgear

The company’s focus on innovation and sustainability has positioned it among the most trusted encapsulated transformer brands worldwide.

8. Triad Magnetics

Triad Magnetics is well-known for its high-quality small encapsulated transformers, chokes, and inductors used in electronics and control systems. Based in Perris, California, Triad serves both industrial and commercial clients.

Their encapsulated transformers are often used in control panels, power supplies, and low-voltage lighting systems.

Product Strengths:

• Compact, epoxy-filled housings
• High insulation resistance
• Custom voltage and frequency options
• UL, RoHS, and REACH compliant

Triad Magnetics stands out for its engineering support, helping clients design tailored encapsulated transformer solutions.

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9. Micron (Franklin Electric Brand)

Micron is a trusted name in industrial control transformers and encapsulated units. Their encapsulated models are built for extreme conditions, ensuring stable voltage output and long service life.

The company’s Flex Mod and ImperviTRAN series transformers are recognized for robust construction and thermal stability.

Key Features:

• Fully encapsulated resin system
• NEMA-rated enclosures
• UL listed and CE marked
• Designed for vibration-prone environments

Micron focuses heavily on quality assurance and performance reliability, making it a go-to brand for industrial automation systems.

10. TEMCo Industrial Power Products

TEMCo Industrial, based in Fremont, California, manufactures high-quality encapsulated and dry-type transformers for the North American market.

Their encapsulated units are designed for outdoor and corrosive environments. TEMCo offers both off-the-shelf and custom built transformer solutions.

Main Benefits:

• Epoxy resin encapsulated windings
• Stainless steel NEMA enclosures
• High efficiency and low noise
• Competitive pricing and fast delivery

TEMCo’s strong customer support and consistent quality have helped it build a loyal base among engineers and electricians across the U.S.

Comparison Table of Top 10 Encapsulated Transformer Manufacturers in USA

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Choosing the Right Encapsulated Transformer Manufacturer

Selecting the best encapsulated transformer manufacturer in the USA depends on your application, environment, and voltage requirements. For high-capacity industrial installations, companies like Hammond Power Solutions, MGM Transformer, and ABB are ideal.

For smaller, control-based systems, Triad Magnetics or Micron offer compact, reliable solutions. If you prioritize local customization and fast delivery, TEMCo Industrial and Marcus Transformer are strong contenders.

Always consider factors such as:

• Certification (UL, CSA, DOE compliance)
• Enclosure rating (NEMA 3R, 4X, or explosion-proof)
• Core efficiency and loss ratings
• Customization options

Investing in a high-quality encapsulated transformer ensures operational reliability, minimal maintenance, and compliance with U.S. energy standards.

Conclusion

Encapsulated transformers are essential for power reliability in challenging environments. The top 10 encapsulated transformer manufacturers in USA deliver durable, efficient, and high-performance solutions for diverse industries — from manufacturing to renewable energy.

Whether you are looking for a small control transformer or a high-capacity distribution model, the companies listed above provide tested and certified solutions built to last. Choosing the right manufacturer not only ensures safety and performance but also maximizes long-term value for your electrical system.

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