BRIDGEPORT MAGNETICS · EST. 1982

Engineered today.
Powering tomorrow.

Custom toroidal transformers designed for critical power systems of the future, delivering peak efficiency and superior power density. Manufactured to the highest quality standards in Connecticut since 1982 for Datacenters, Electrical Utilities, BESS/Microgrids, Medical Equipment, Marine Isolation, and many more unique applications.

01 · By the Numbers

Four Decades of Toroidal Transformer Manufacturing

Years designing and manufacturing
toroidal transformers

Custom designs
in production

30 VA – 70 kVA (1PH)
Up to 150 kVA (3PH)

Standard power range

UL Listed · CSA Certified
CE Marked · IEC 60601-1

Fully certified for global markets

02 · Featured Products

Designed and Manufactured in the United States

PowerBack™

Portable toroidal auto-transformers that instantly restore lost 120V or neutral power, keeping residential and industrial operations running without interruption.

PowerTower™

High-efficiency 3-Phase toroidal power tower transformers engineered for stable voltage management and superior power density in large-scale industrial, BESS, and datacenter applications.

MarinePuck™

Compact, ABYC compliant, UL marine certified shore-power isolation transformers in a corrosion-resistant puck design – delivering electrical isolation to protect onboard systems from galvanic corrosion and electrical shock.

IsoPuck™

Medical-grade isolation transformers in a compact puck format – dramatically reduce leakage current and vibration to protect sensitive medical equipment and ensure patient safety.

Custom Toroidal Transformers

Custom-designed toroidal transformers delivering peak efficiency and superior power density. 30 VA – 70 kVA. UL, CSA, CE, IEC 60601-1 certified.

Custom Transformer Cores

Premium toroidal transformer cores wound, heat treated, and epoxy coated to the highest quality standards.

The Benefits of Toroidal Transformers

Higher Efficiency

Achieves up to 99%+ efficiency with the lowest core and copper losses in its class, delivering major energy savings and improved system performance over traditional laminated E-I transformers.

Compact & Lightweight

Up to 50% smaller and lighter design fits standard enclosures without redesign, simplifying installation and reducing shipping and handling costs.

Minimal EMI / Stray Fields

85–95% lower electromagnetic interference creates a cleaner environment for sensitive electronics and eliminates the need for extra shielding.

Superior Reliability & Thermal Management

Generates significantly less heat and operates cooler, resulting in longer service life, fewer failures, and reduced maintenance and warranty exposure.

Ultra-Quiet Operation

Runs up to 8X quieter with virtually no hum or vibration, making it ideal for noise-sensitive environments.

03 · Industries Served

Through our custom toroidal transformer designs, we're delivering the peak efficiency, superior power density, and reliability that tomorrow's critical power systems demand

Electrical Utilities

Power restoration auto transformers, current transformers, street light transformers, LV 3-phase transformers.

BESS & Microgrids

Battery energy storage dry-type transformers and next-generation 3-phase microgrid transformers.

Data Centers & UPS

Uninterruptible power for data centers, BESS, and industrial plants.

Medical

MRI, precision equipment, safety isolation transformers, hospital 3-phase dry-type transformers, IsoPuck medical isolation systems.

Marine

Shore-power 3-phase / single-phase transformers, boat isolation transformers.

Every project starts with a phone call

Send us a specification, CAD, or a problem. We’ll quote in days, not weeks – and our engineers pick up the phone

4 · News & Insights

Sizing guides, design notes, and application stories

Sizing guides, application notes, and customer stories from the Shelton factory floor.

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Low Leakage Current Medical Isolation Transformers: Why They Matter for Patient Safety

July 21, 2026

Low leakage current medical isolation transformers help protect patients by keeping electrical leakage within the strict limits of IEC 60601. This post explains why low leakage performance matters in healthcare and how these transformers support safer medical equipment.

Read article →