Introduction
With the increase in global electricity demand, power infrastructure is entering a new round of upgrades. According to MarketsandMarkets, the global transformer market is estimated to reach USD 88.48 billion by 2030, representing a compound annual growth rate of 6.5% over the next five years.
Distribution transformers are important intermediate equipment in power transmission and distribution systems. At present, the most common types of distribution transformers on the market are dry-type transformers and oil-immersed transformers. At present, the most common types of distribution transformers in the mainstream market are dry-type transformers and oil-immersed transformers.
An oil-immersed transformer is a power transformer in which the core and windings are completely immersed in insulating oil. With good heat dissipation performance and a wide capacity range, it is commonly used in outdoor applications.
Dry-type transformers, by contrast, use natural air cooling (AN) and forced air cooling (AF). Since they do not require insulating oil and are relatively easy to maintain, they are commonly used in indoor applications.
Dry-type transformers have no risk of oil leakage or explosion and can meet indoor installation requirements, making them particularly suitable for AI data centers. This has greatly promoted the development of dry-type transformers. Of course, low losses and high efficiency are also indispensable reasons for their widespread use.
Today, we will take a look at the top 10 dry-type transformers and their manufacturers in 2026.
Note: The rankings in this article are in no particular order and are based only on product technology and market recognition.
RESIBLOC cast resin dry-type distribution transformers manufactured by Hitachi Energy have extremely high mechanical strength and can withstand thermal and mechanical stresses caused by harsh climates, cyclic loading, and short-circuit forces. Their windings are sealed and cast with epoxy resin without the need for molds, thereby maximizing design flexibility.
| Specification | Value |
|---|---|
| Voltage | Up to 36 kV, with high voltage up to 36 kV and low voltage up to 24 kV |
| Classes | E2, E3, E4, C2, C3, C4 and F1 |
| Frequencies | 50 Hz, 60 Hz and 16 ⅔ Hz |
| Cooling | AN | ANAN | ANAF | AFWF |
| Insulation System Temperature | Class F |
| Partial Discharges | < 10 pC |
| Protection Degree | IP00 – IP54 |
RESIBLOC dry-type transformers are known for their comprehensive product range, offering solutions up to 63 MVA and 72.5 kV and complying with all distribution transformer standards. Their flexible design includes transformers capable of operating at extremely low ambient temperatures down to -60°C, providing stronger resistance to short-circuit stresses and better performance under load variations. The product has demonstrated extremely high reliability and safety.
Website:https://www.hitachienergy.com/us/en/products-and-solutions/transformers/distribution-transformers/dry-type-transformers/resibloc-transformers
Siemens Energy’s GEAFOL cast-resin dry-type transformers are mainly used to convert medium-voltage electrical energy into low-voltage electrical energy or into other grid voltage levels. Due to their extremely high safety and reliability, they can be installed in areas close to where people are present.
| Specification | Value |
|---|---|
| Rated Power | 100 kVA – 50 MVA |
| Voltage | Up to 66 kV; standard distribution models up to 36 kV highest voltage for equipment |
| Environmental Class | E2 (GEAFOL standard); E3 (GEAFOL Neo standard) |
| Climatic Class | C2, C3, C4 |
| Fire Behavior Class | F1 |
| Frequency | 50 / 60 Hz; special frequencies subject to model confirmation |
GEAFOL cast-resin dry-type transformers benefit from Siemens Energy’s strong R&D capabilities. For wind turbines and offshore wind farms, the transformers have been optimized for vibration resistance, weather resistance, salt-spray resistance, and anti-vibration performance. Thanks to these advantages, more than 150,000 units of this type of transformer are currently in operation worldwide.
Website：https://www.siemens-energy.com/global/en/home/products-services/product-offerings/transformers.html
With new digital and IoT capabilities, Trihal dry-type transformers offer scalable digital functionality. These features enable users to take advantage of condition monitoring and other digital tools to improve safety, reliability, and production efficiency. Even under harsh conditions, Trihal transformers maintain high performance and efficiency, providing a high level of safety and reliability.
| Specification | Value |
|---|---|
| Rated Power | Up to 15 MVA |
| Rated LV (MV) Insulation Level | 1.1 – 7.2 kV |
| Frequency | 50 – 60 Hz |
| Rated HV Insulation Level | Up to 36 kV (IEC) |
| Insulation Class | F (155 °C) |
| Vector Group | Star / Delta |
| Manufacturing Standards | IEC 60076-11:2018, EN 50588, EN 50629 |
| Efficiency (Losses Level) | Eco-Design (on request) |
| Class Tests | C4, E4, F1, ≤ 5 pC |
| HV / LV Coils | HV encapsulated in cast resin / LV impregnated (cast / cast on request) |
| Cooling System | Standard: AN (natural air); Option: AF (air forced) |
Since Schneider Electric’s Trihal dry-type transformer was launched more than 35 years ago, more than 150,000 units have been manufactured. It has maintained a leading position in safety, reliable operation, and long service life. With the addition of digital and IoT capabilities, it is able to address new challenges in power network operation and maintenance, helping users avoid unplanned downtime, improve safety, and save time.
Website：https://www.se.com/in/en/product-range/977-trihal/#products
Unlike the brands introduced above, AAB’s ReliaGear XFMR series transformer is a low-voltage dry-type transformer that safely and efficiently converts voltage levels for equipment, machinery, and facility power systems in commercial, industrial, and infrastructure applications. It helps electrical engineers, switchboard manufacturers, contractors, and facility operators provide reliable power distribution while maintaining safety, energy efficiency, and operational continuity.
| Specification | Value |
|---|---|
| Product Name | ReliaGear® XFMR |
| Transformer Type | Low Voltage Dry-Type Transformer |
| Rated Power | 15 – 750 kVA (general-purpose distribution series) |
| Voltage Class | 600 V and below |
| Typical Primary Voltage | 600 V, 480 V, 240 V |
| Typical Secondary Voltage | 480 V, 277 V, 240 V, 208 V, 120 V |
| Phase | Single-phase, three-phase |
| Frequency | 60 Hz (North American general-purpose distribution series) |
| Winding Material | Copper or aluminum |
| Insulation System | 220 °C (selected models) |
| Winding Temperature Rise | 80 °C, 115 °C, 150 °C (depending on configuration) |
| Ambient Temperature | 40 °C (standard design condition) |
| Enclosure Rating | NEMA 2, upgradable to NEMA 3R on selected models |
| Efficiency Standard | DOE 2016 |
| Applicable Standards | IEEE C57.12.01, IEEE C57.12.91, UL 1561, NEMA ST-20 |
ReliaGear XFMR low-voltage dry-type transformers are durable and feature unique design characteristics. They are easy to install and, combined with ABB’s proven power distribution expertise, innovative design, and global application experience, are favored by contractors.
Website：https://electrification.us.abb.com/products/transformers-low-voltage-dry-type
Eaton’s dry-type transformer solutions are custom-designed dry-type power transformers with environmentally friendly characteristics, suitable for both indoor and outdoor applications. These products can be used with Eaton’s coordinated primary and secondary unit substations and feature explosion resistance, fire resistance, and pollution-free operation.
| Specification | Value |
|---|---|
| Rated Maximum Primary Voltage | 4.76 kV, 15 kV, 23 kV, 34.5 kV, 46 kV |
| kVA – Three Phase | 112.5 – 32,000 kVA |
| Basic Impulse Level (BIL) | 150 kV BIL and below |
| Secondary Voltage | 208 V – 34.5 kV |
| IEEE Standard | 100-1977 |
| ANSI | C57.12.00, C57.12.91 |
| NEMA | 201-1982 |
| CSA | C88 |
| Third-Party Approval / Recognition | UL, FM |
| Seismic Qualification | Zone 4 certification |
| Insulating Medium | VPI, VPE, Cast Coil, RESIBLOC |
| Enclosure Type | NEMA 1, NEMA 3R |
| Bus Material | Copper, Aluminum |
Eaton’s medium-voltage dry-type transformers combine value and reliability and offer a variety of options to enhance system protection and environmental responsibility. Backed by Eaton’s strong engineering capabilities, a wide range of standard and customized solutions are available to meet the needs of utility, commercial, and industrial applications.
Website：https://www.eaton.com/us/en-us/catalog/medium-voltage-power-distribution-control-systems/medium-voltage-dry-type-transformers.html
Hammond Power Solutions (HPS) is a leading North American manufacturer of standard and custom dry-type transformers. As a leading company in North America, its HPS Millennium series VPI dry-type transformers are among its flagship products.
| Specification | Value |
|---|---|
| Rated Capacity (kVA) | 225 – 2500 kVA (DOE 2016 / NMX 2021); 225 – 7500 kVA (NRCan 2019); others available upon request |
| High Voltage (Primary) | Up to 34.5 kV class, up to 175 kV BIL; up to 150 kV BIL per CSA and IEEE/ANSI standards; standard taps ±2.5%, ±5%; other options available upon request |
| Low Voltage (Secondary) | 208Y/120 V to 600Y/347 V and 2.4 – 5 kV, up to 60 kV BIL; higher BIL available upon request |
| Frequency | 60 Hz; others available upon request |
| Insulation System | 220 °C (200 °C for some lower kVA ratings) |
| Enclosure Type | Type 1, 2, 3R, 4/4X or 12; others available upon request. Optional HPS Type 3RE Plus enclosure for improved outdoor performance. Lift-off hinged doors for easy access and removal. Built-in forklift capability. |
| Enclosure Finish | ANSI 61 Grey; compliant with UL 50 |
| Neutral | Neutral terminal for field connection (on applicable units) |
| Temperature Rise | 150 °C typical; optional 115 °C and 80 °C |
| Termination | Front-accessible separate high- and low-voltage terminals; connectors suitable for aluminum and copper conductors provided for easy cable installation |
| Impedance | 3 – 7%, typically 5.75% |
| Seismic | Qualified according to IBC 2018 and ASCE 7-16; spectral acceleration: SDS ≤ 2.0 g; importance factor: Ip = 1.5; attachment/height ratio: z/h = 0; OSHPD compliance available upon request |
| Sound Level | Meets IEEE C57.12.01; other sound level performance available |
| Altitude | Standard up to 1000 m; derating required above 1000 m |
| Ambient Temperature | -20 °C to 40 °C; derating possible from 40 °C to 60 °C (consult HPS) |
| Duty | Special duty available upon request |
HPS Millennium medium-voltage transformers are known for their high quality and service reliability and have become synonymous with VPI dry-type transformer products. The product has been widely proven in the market and is suitable for a variety of commercial, industrial, manufacturing, and process applications. It can also be customized for different environmental conditions and manufactured to meet the most demanding operating requirements.
Website：https://americas.hammondpowersolutions.com/products
On the basis of traditional manufacturing technologies, TBEA has formed an innovative composite filler insulation technology through improvement, R&D, and innovation, making it one of the backbone enterprises in the global cast-resin dry-type transformer industry. The company has the capability to develop transformers up to 50,000 kVA / 110 kV and can manufacture epoxy resin cast dry-type transformers rated at 110 kV and below. Its annual transformer output exceeds 10 million kVA, ranking among the leading companies in the industry.
| Specification | Value |
|---|---|
| Transformer Type | Cast Resin Dry-Type Transformer |
| Product Series | SCB13, SCB18-ZN, SCBH15, SCSB-F, SCZ-H·ZN |
| Rated Capacity | 1,250, 2,500, 7,400 and 50,000 kVA (representative models) |
| Voltage Class | 10 kV, 35 kV; up to 110 kV for special models |
| Rated Frequency | 50 Hz (customizable) |
| Cooling Method | AN, AF, AFWF (depending on model) |
| Core Material | Silicon steel, amorphous alloy |
| Vector Group | Dyn11, Dy11y11, YNd11, etc. |
| Short-Circuit Impedance | 6%, 10%, 15% (depending on model) |
| Insulation Technology | Epoxy resin casting |
| Partial Discharge | < 5 pC (SCB18-ZN series) |
| Environmental Class | E4 (specific offshore wind models) |
| Climatic Class | C4 (specific offshore wind models) |
| Fire Behavior Class | F1 (specific offshore wind models) |
| Applications | Industrial power distribution, commercial buildings, data centers, wind power, smart grids, etc. |
Relying on its leading technologies in green and energy-efficient power transmission and distribution, TBEA is committed to sharing advanced power construction experience with the world. TBEA has supplied green, environmentally friendly, reliable, and efficient energy equipment to more than 90 countries and regions, and has undertaken integrated turnkey projects in more than 40 countries, providing one-stop system solutions covering surveying, design, construction, installation, testing and commissioning, operation, and maintenance, thereby promoting the development of green and efficient power grids.
Website：https://en.tbea.com/product_list/36.html
CG Power and Industrial Solutions, formerly REB Crompton & Co., has a history of more than 88 years and has been a pioneer in the engineering sector. Today, CG’s business covers transformers, switchgear, motors, drives, and automation products. It has grown from a pioneering Indian enterprise into a global force. With 18 world-class manufacturing facilities and more than 7,000 skilled professionals, CG focuses on designing and delivering high-performance engineering solutions, ensuring that its products can operate reliably in a wide range of demanding environments worldwide.
| Specification | Value |
|---|---|
| Type | Cast Resin Type (CRT) or Vacuum Pressure Impregnated (VPI) |
| Rating | Up to 10 MVA |
| Rated Voltage | Up to 33 kV |
| Frequency | 50 Hz or 60 Hz |
| Standards | IS, IEC |
| Insulation | Class H or F |
In 2020, CG joined Murugappa Group, one of India’s most respected business groups, marking the beginning of a new era of innovation and excellence. As of fiscal year 2025–2026, CG’s standalone revenue has exceeded USD 1.2 billion, representing year-on-year growth of 21%.
At the same time, through strategic acquisitions and the establishment of multiple joint ventures, CG has expanded its market coverage. These partnerships have significantly extended CG’s global footprint and strengthened its competitive advantage.
Website：https://www.cgglobal.com/products/dry-type-cast-resin-transformers
As a Brazilian electrical equipment manufacturer, WEG is one of the most influential electrical equipment manufacturers in South America. Its dry-type transformers can meet requirements for higher safety, space savings, and reduced installation and maintenance costs. To adapt to various operating environments, WEG dry-type transformers use vacuum encapsulation technology and high-quality resin, enabling partial-discharge-free performance and significantly extending transformer service life.
| Specification | Value |
|---|---|
| Transformer Type | Epoxy Resin Dry-Type Transformer |
| Rated Capacity | 112.5 – 20,000 kVA |
| Voltage Class | Up to 36.2 kV |
| Rated Frequency | 60 Hz (listed standard models) |
| Winding Material | Copper or aluminum |
| Insulation Technology | Epoxy resin encapsulation |
| Insulation Class | Class H (selected models) |
| Cooling Method | AN; AFWF for special applications |
| Protection Degree | IP00 – IP55 |
| Vector Group | Dyn1 (selected standard models) |
| Applicable Standards | IEC 60076-11, ABNT NBR 5356-11 |
| Applications | Industrial facilities, commercial buildings, data centers, hospitals, airports, offshore platforms |
WEG offers a wide range of dry-type transformers and has more than 20 years of experience in manufacturing this type of product, using mature technology suitable for a wide range of applications.
In addition to its high product quality, one of WEG’s greatest advantages is its extensive network of certified technical assistants throughout Brazil, ensuring fast, localized technical service and support for its customers.
Website：https://www.weg.net/catalog/weg/US/en/Generation%2CTransmission-and-Distribution/Dry-Type-Transformers/Small-%28Up-to-300kVA%29/Dry-Type-Transformer/p/MKT_WTD_SMALL_DRY_TYPE_TRANSFORMER_UP_TO_300KVA
CHBEB has more than 60 years of experience in transformer manufacturing and provides OEM and ODM services. CHBEB implements quality control throughout the entire production process of its dry-type transformers and insists on working with leading raw material suppliers in the industry. From silicon steel sheets, copper wire, and insulation materials to transformer electrical accessories, product quality and stability are ensured from the source.
| Specification | Value |
|---|---|
| Transformer Type | Cast Resin Dry-Type Transformer |
| Rated Capacity | 100 – 10,000 kVA |
| Voltage Class | Up to 36 kV |
| Rated Frequency | 50 / 60 Hz (customizable) |
| Cooling Method | AN, AF |
| Winding Material | Copper or aluminum |
| Insulation Technology | Epoxy resin casting |
| Insulation Thermal Class | Class F, Class H (depending on model) |
| Environmental Class | Subject to model confirmation |
| Climatic Class | Subject to model confirmation |
| Fire Behavior Class | Self-extinguishing resin (specific classification to be confirmed) |
| Protection Degree | IP00 (without enclosure); other ratings customizable |
| Applicable Standards | IEC 60076, IEC 60076-11 |
| Applications | Industrial power distribution, commercial buildings, data centers, hospitals, factories and infrastructure projects |
CHBEB resin-insulated dry-type transformers combine excellent performance, low noise, and energy efficiency. In addition to its long-term focus on the transformer industry, CHBEB also relies on China’s strong supply chain network to provide diversified OEM/ODM solutions for customers worldwide.
Website：https://chbeb-ele.com/product-category/dry-type-transformer/
If you value advanced transformer technology and intelligent monitoring, you may consider Hitachi Energy, Siemens Energy, and Schneider Electric.
If your project focuses on specific technologies or application scenarios, such as VPI technology or low-voltage distribution, you may consider HPS and ABB.
If you require high-voltage, large-capacity transformers for special operating conditions, you may choose Eaton, TBEA, and CG Power.
If your project is located in the South American market and requires stronger local support, WEG may be a good choice.
Finally, if you need dry-type transformers with greater price advantages and customization flexibility, CHBEB is your best choice.
