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Custom Dry-Type Transformers, Manufactured in Canada

For over 50 years, Rex Power Magnetics has been designing and building CSA-certified, UL-listed dry-type transformers in Concord, Ontario, for industrial, commercial, and utility applications across North America. From standard distribution units to custom medium-voltage cast coil designs, our engineering team builds transformers to your specifications — and tests them in our accredited on-site facility before they ship.

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Built and Tested to UL, IEEE, and CSA Standards

Every transformer is tested in our CSA-certified on-site facility before it ships. Routine and type testing are performed to UL, IEEE, and CSA standards, with customer-witnessed testing available on request — providing verified performance and full documentation with every unit.

Rex Power Magnetics is a Canadian manufacturer of low-voltage distribution and medium-voltage dry-type power transformers, trusted by engineers and specifiers across North America.

What Sets Rex Apart

Designed and built in Canada. Lead times you can plan around, with engineering and inventory on the same continent as your project.

Custom-engineered as standard. Most of what we ship is built to specification — not pulled from a catalog. Special voltages, taps, enclosures, and cooling configurations are everyday work.

CSA-certified testing on every unit. Tested to UL, IEEE, and CSA standards in our own facility. Test reports available on request.

Engineering support throughout the project. Our team works with specifiers, OEMs, and contractors from initial design through commissioning — not just at the quote stage.

Product Categories

From standard distribution units to custom medium-voltage designs, Rex builds dry-type transformers and power magnetic products for industrial, commercial, and utility applications.

Medium Voltage Power Transformer

Cast coil and VPI/VPE construction up to 15,000 kVA and 46 kV class. Built to specification for utilities, data centers, renewable energy, and industrial facilities where high reliability and short-circuit strength are critical.

Low Voltage Distribution Transformer

General-purpose, K-factor rated, and harmonic mitigating designs from 15 kVA to 5,000 kVA. Suitable for commercial buildings, industrial plants, and light-industrial power distribution.

Also: Autotransformers · Industrial Control · Hazardous Location · Mini Power Centers · Reactors and Filters · RC Snubbers

Industries We Serve

EV Charging

Custom transformers for Level 2 and DC fast-charging installations — including workplace charging, fleet depots, retail and hospitality sites, highway corridors, and public charging hubs. DC fast chargers in particular generate significant harmonic distortion and demand continuous-duty operation under variable load. Rex designs feature low-loss cores, harmonic-tolerant windings, and dual-primary configurations that allow site flexibility as charging infrastructure scales from a handful of stalls to high-throughput hubs.

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Energy Storage

Transformers for grid-scale BESS, commercial-industrial storage, and behind-the-meter installations. Energy storage applications require high round-trip efficiency to minimize losses across charge-discharge cycles, fast response to dynamic load conditions, and stable voltage regulation to protect sensitive power electronics.

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Power Quality

Harmonic mitigating transformers, line reactors, and harmonic filters for environments dominated by power-electronic loads. Improving power quality at the source reduces equipment stress, extends life of downstream components, and helps facilities meet IEEE 519 limits for harmonic distortion.

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Mining

Rugged designs for the vibration, airborne dust, and harsh environmental conditions typical of surface and underground mining operations. Custom enclosures, hazardous-location ratings, and high short-circuit withstand capability are available for installations in confined or classified environments.

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Temporary Power

Portable, fast-deploying transformers for construction sites, emergency response, disaster recovery, and event power. Multiple voltage taps and dual-primary windings allow a single unit to serve a wide range of incoming voltages. Quick-connect terminals and skid-mounted configurations available for rapid setup.

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Data Centers

K-factor rated and harmonic-mitigating designs for IT load environments. Modern data centers run on non-linear loads that generate harmonic currents and waste heat — Rex transformers are engineered to manage harmonics, reduce losses, and support the redundancy and density requirements of mission-critical facilities.

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Marine Duty

Corrosion-resistant construction for shipboard, offshore, and coastal installations. Marine environments combine salt-air exposure, vibration, and confined-space constraints. Rex marine duty transformers are available with NEMA 4X enclosures, stainless-steel construction, and seismic-rated mounting for vessels and offshore platforms.

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