- ISO 9001
- UL Recognized
- Made in USA
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 1984 for Datacenters, Electrical Utilities, BESS/Microgrids, Medical Equipment, Marine Isolation, and many more unique applications.
Four decades of Toroidal Transformer manufacturing
Years designing and manufacturing
toroidal transformers
Custom designs
in production
Up to 375 kVA (3PH)
Standard power range
CE Marked · IEC 60601-1
Fully certified for global markets
Designed and Manufactured in the United States
Portable toroidal auto-transformers that instantly restore lost 120V or neutral power, keeping residential and industrial operations running without interruption.
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.
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.
Custom-designed toroidal transformers delivering peak efficiency and superior power density. 30 VA – 70 kVA. UL, CSA, CE, IEC 60601-1 certified.
Premium toroidal transformer cores wound, heat treated, and epoxy coated to the highest quality standards.
Medical-grade isolation transformers in a compact puck format — dramatically reduce leakage current and vibration to protect sensitive medical equipment and ensure patient safety.
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.
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, hospitals, 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
Sizing guides, design notes, and application stories
Sizing guides, application notes, and customer stories from the Shelton factory floor.
Marine Isolation Transformer vs Galvanic Isolator: Which Does Your Boat Actually Need?
Every boat that plugs into shore power requires protection, because the dock’s electrical system and your boat’s underwater
Custom Toroidal Transformers Design Guide
Designing a custom transformer helps give you exactly what you need: voltage, VA rating, and frequency. However, custom
What Role Do Custom Inductors Play in Circuit Stability and Efficiency
Custom inductors are essential components that help achieve optimal circuit stability and efficiency in various electrical applications. By