Continuous power
for operations that cannot go down.
Vacuum cast-coil dry-type transformers in epoxy resin for data centers, IT rooms, and mission-critical operations. Low fire load, harmonic tolerance, and availability engineered for N+1 and 2N topologies. Compliant with ABNT NBR and IEC standards.
30 years turning
energy into reliability.
Since 1994, União Transformadores has designed and manufactured DRY dry-type transformers and low-voltage transformers in São Paulo. Three decades dedicated to electrical engineering, with vertically integrated production, an in-house laboratory, and technical support throughout Brazil.
- 1994Foundation
União Transformadores is founded in São Paulo, focused on low-voltage transformers for domestic industry.
- 2002Entry into Medium Voltage
Expansion of the manufacturing plant and start of production of medium-voltage distribution transformers.
- 2010Vacuum Cast-Coil DRY Line
Launch of the DRY line of dry-type transformers with vacuum cast coils in epoxy resin.
- 2016Testing Laboratory
Opening of an in-house test bench for routine, type, and special tests under NBR 5356 and IEC 60076.
- 2020DRY Solar and Critical Infrastructure
Development of the DRY Solar and Solar BT lines for photovoltaic generation, data centers, and electric mobility.
- 202430 Years in Operation
Over a thousand companies served across industry, utilities, solar energy, and critical infrastructure throughout Brazil.
Dry-type DRY transformers
for critical infrastructure.
Three product lines covering the full electrical chain of a data center: from the medium-voltage entrance to white space distribution.
Data Hall · Dry-Type Medium Voltage
Vacuum cast-coil dry-type transformer for indoor data center substations. Oil-free, low fire load, and installation close to the load center, eliminating the need for firewalls and containment basins.
- Power
- 150 – 10,000 kVA
- Voltage
- 15 / 24 / 36 kV
- IP Rating
- IP00 – IP54
Electrical Room · Shielded Enclosure
DRY core in a ventilated metal enclosure for electrical rooms and mission-critical galleries. Protection against accidental contact and dust in environments with concurrent maintenance and restricted access.
- Power
- 150 – 10,000 kVA
- Voltage
- 15 / 24 / 36 kV
- IP Rating
- IP21 – IP54
White Space · Low Voltage
Low-voltage isolation transformers and autotransformers for PDUs, racks, and voltage adaptation in the white space, plus the DRY Solar lines for on-site generation and reduced energy OPEX.
- Power
- 5 – 1,500 kVA
- Voltage
- up to 1,1 kV
- IP Rating
- IP00 – IP54
Specified for operations
that measure uptime in nines.
In mission-critical environments, the transformer stops being a commodity: it determines fire load, electrical room footprint, behavior under harmonics, and the ability to keep the data hall energized during maintenance.
Zero Oil, Low Fire Load
Dry cast-coil technology in epoxy resin: no insulating liquid, no containment basin, and no explosion-proof room needed inside the IT building.
Harmonic Tolerance
K-factor design for nonlinear loads from UPS units, rectifiers, and switching power supplies, preventing overheating and loss of service life.
Ready for N+1 and 2N
Sizing by load block and parallel operation between units, sustaining concurrent maintenance without bringing down the data hall.
Continuous Monitoring
PT-100 sensors on all three phases and a digital controller with alarm, shutdown, and serial communication integrable with the operation's BMS/DCIM.
Engineering specified for
operations that cannot stop.
Every project begins with understanding the operation. We specify, size, and test according to the application segment.
Data Centers & Colocation
Indoor substations, UPS blocks, and white space distribution with galvanic isolation and high availability.
Healthcare & Telecom
Hospitals, telephone exchanges, and network sites where a power outage interrupts essential service.
Continuous-Process Industry
24/7 processes, control rooms, panels, and machinery that cannot tolerate unplanned downtime.
Utilities & Generation
Utility companies, substations, BESS, and solar plants that power critical infrastructure.
From design to after-sales,
under the same engineering team.
We cover the full transformer life cycle, from sizing to field support: no outsourcing what we do best.
Field commissioning and start-up performed by factory technicians.
Modernization of existing transformers and full bench rebuild services.
Routine, type, and special tests in accordance with NBR 5356 and IEC 60076.
Extended warranty program with periodic inspection and technical support.
A vertically integrated production line, with in-house engineering and an internal test bench.
- In-house engineering
- Laboratory testing
- In-house winding
- Vacuum impregnation
Companies that trust
our engineering.
A sample of the clients who have already specified União transformers in their operations, from steel and mining to utilities, telecom, retail, and power generation.
What the people who
specify and operate say.
Engineers, technicians, and managers who work daily with União transformers in the field.
Transformadores União is a company whose technical and commercial teams are committed to maintaining the quality of the equipment they manufacture, with a primary focus on meeting customer needs.
At our Resende plant, ArcelorMittal Sul Fluminense operates several União dry-type transformers, and they have fully met our expectations for product quality and reliability. They are robust equipment for industrial applications.
I was responsible for operating a União dry-type transformer at the Sumidouro Hydroelectric Plant. A very robust transformer that, once in operation, showed high reliability and low maintenance needs. I recommend it!
Equipment with excellent build quality, top-grade materials, and an engineering team that always meets every requirement in the specification. The performance of União transformers at the Tucuruí and Curuá-Una hydroelectric plants has been excellent!
True partners. I can only thank them for the collaboration, as well as the pricing and quality of their products.
Describe your application.
Engineering will respond.
We reply within one business day with sizing details and a technical-commercial proposal.