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PowerTower Series
At Bridgeport Magnetics, we help data center operators, BESS developers, and industrial engineers achieve superior power density and lower energy costs. Our PowerTower high-efficiency 3-phase toroidal transformers deliver exceptional efficiency, compact vertical design and ultra-quiet low-EMI operation up to 150 kVA - built for reliable performance in AI data centers, energy storage systems, and demanding industrial application
Compact. Efficient. Powerful. Toroidal Transformers for High-Density Applications
Lower Energy Losses
lighter than Traditional E-I Transformer
Designs up to 150kVA Power Rating
Power Efficiency
High-Efficiency 3-Phase Toroidal Power, Built for Density
The PowerTower is a high-efficiency 3-phase toroidal transformer up to 150 kVA in a compact vertical tower design. Fully customizable to your voltage and connection requirements, UL Recognized, and built in the USA with fast lead times.
AI data centers, BESS systems, and industrial facilities need higher power density with lower energy losses, heat, and noise. Traditional dry-type transformers are often bulky and inefficient. The PowerTower uses continuous toroidal cores to deliver significantly lower losses, reduced EMI, cooler and quieter operation, and a much smaller footprint – providing reliable power where space and efficiency matter most. Every unit is built to your exact specifications.
Through our custom toroidal transformer designs, we're delivering the superior power density, exceptional efficiency, and uncompromising reliability that tomorrow's AI data centers, energy storage systems, and critical industrial infrastructure demand.
AI Data Center Transformers
High-density power distribution for AI racks, PDUs, and hyperscale facilities
BESS Energy Storage Transformers
Compact, high-efficiency transformers for battery energy storage systems
Industrial Manufacturing Power
Reliable 3-phase power for motor drives, automation, and process equipment
EV Charging Infrastructure
Transformers for commercial DC fast charging hubs and fleet depots
Critical Power & UPS Systems
Efficient, space-saving transformers for mission-critical power
Specifications
Technical Specifications Available in both Single Phase and Three Phase. All models feature 480V primary to 208Y/120V secondary (standard). Custom voltages available upon request.
Single Phase Low Voltage Transformers
| Model Number | Rating kVA | ID | Width (in) | Height (in) | Depth (in) | Weight (lbs) |
|---|---|---|---|---|---|---|
| 050-830-05 | 5 | F | 18.25 | 22 | 7 | 70 |
| 050-830-10 | 10 | F | 18.25 | 22 | 7 | 130 |
| 050-830-15 | 15 | D | 20.25 | 28 | 9 | 140 |
| 050-830-25 | 25 | D | 20.25 | 28 | 9 | 190 |
| 050-830-30 | 30 | B | 24.25 | 31.75 | 11.5 | 220 |
| 050-830-40 | 40 | B | 24.25 | 31.75 | 11.5 | 290 |
| 050-830-50 | 50 | B | 24.25 | 31.75 | 11.5 | 335 |
| 050-830-75 | 75 | C | 20.25 | 60 | 9 | 500 |
| 050-830-90 | 90 | A | 24.25 | 31.75 | 11.5 | 585 |
| 050-830-120 | 120 | A | 24.25 | 31.75 | 11.5 | 675 |
| 050-830-150 | 150 | A | 24.25 | 31.75 | 11.5 | 750 |
| Model Number | Rating kVA | ID | Width (in) | Height (in) | Depth (in) | Weight (lbs) |
|---|---|---|---|---|---|---|
| 050-833-15 | 15 | F | 18.25 | 48 | 7 | 180 |
| 050-833-30 | 30 | F | 18.75 | 48 | 7 | 300 |
| 050-833-45 | 45 | C | 20.25 | 60 | 9 | 320 |
| 050-833-75 | 75 | C | 20.25 | 60 | 9 | 500 |
| 050-833-90 | 90 | A | 24.25 | 31.75 | 11.5 | 585 |
| 050-833-120 | 120 | A | 24.25 | 31.75 | 11.5 | 675 |
| 050-833-150 | 150 | A | 24.25 | 31.75 | 11.5 | 750 |
Fully Customizable 3-Phase Power Solutions
The PowerTower’s biggest advantage for OEMs and system integrators is full customizability. We engineer each unit to your exact voltage, tap, kVA, and configuration requirements – whether you need specific leads, terminations, mounting, or enclosure options. Because every PowerTower is designed and built in the USA, customization doesn’t mean long lead times. We can deliver custom units quickly while meeting your project and compliance standards.
USA-Made with Fast Lead Times
Designed and manufactured in Shelton, CT. Custom PowerTower units are built with competitive lead times and no import delays
Custom Voltages, Taps & Configurations
We customize primary/secondary voltages, tap settings, kVA ratings, and 3-phase configurations (delta, wye, or delta-wye) to match your system requirements.
Flexible Mounting & Enclosure Options
Choose from open, enclosed, or custom mounting solutions designed to fit your equipment, cabinet, or facility layout.
Built to Meet Your Standards
We work with OEMs and engineers to meet specific project specifications, electrical codes, and performance requirements for data center, BESS, and industrial applications.
The Benefits of 3PH 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.
Certified for Critical Power Applications
UL Recognized
PowerTower dry-type transformers are UL Recognized, meeting the safety and performance standards required for industrial, commercial, and data center installations
Intertek Certified
Independently tested and certified by Intertek, ensuring consistent quality and compliance with applicable electrical and safety standards.
Built to the Highest Quality Standards
Every PowerTower is engineered and manufactured with rigorous quality controls, precision toroidal cores, and thorough testing to deliver reliable, long-term performance in demanding environments.
Made in the USA
Designed and built in Shelton, Connecticut, offering supply chain security, faster lead times, and full support for domestic content requirements on critical infrastructure projects.
Let's build yours to spec.
Custom Transformers engineered and manufactured in the USA. Tell us your requirements and our engineers will help.
Frequently Asked Questions
What are the advantages of Bridgeport Magnetics PowerTower transformers compared to traditional E-I laminated core dry-type transformers?
PowerTower transformers use a stacked toroidal core design that delivers up to 50% smaller and lighter footprint than conventional E-I laminated transformers of the same kVA rating. They achieve up to 99%+ efficiency with significantly lower core and copper losses, generate far less heat, produce 85–95% lower electromagnetic interference (EMI), and run up to 8× quieter with virtually no audible hum or vibration.
These advantages translate directly into lower energy costs, reduced cooling loads, easier installation in space-constrained environments, longer equipment life, and minimal interference with sensitive electronics – making them a superior modern alternative to legacy E-I designs still common in many facilities.
Are PowerTower transformers suitable for AI data centers, BESS, and high-density power applications?
Yes. The compact vertical “tower” design of our PowerTower series (available up to 150 kVA in three-phase configurations) provides exceptional power density in a small footprint – ideal for AI data center racks, PDUs, hyperscale facilities, battery energy storage systems (BESS), EV charging infrastructure, and critical UPS systems.
Combined with ultra-high efficiency, low EMI, and superior thermal performance, PowerTower transformers help optimize Power Usage Effectiveness (PUE), reduce operating costs, and deliver reliable, clean power in environments where space, heat, and electromagnetic noise are major constraints.
How quiet and EMI-friendly are PowerTower transformers for indoor or sensitive installations?
PowerTower transformers are engineered for ultra-quiet operation – running up to 8× quieter than traditional units with virtually no hum or vibration. They also generate 85–95% lower EMI/stray magnetic fields than conventional E-I transformers.
This makes them an excellent choice for noise-sensitive or EMI-sensitive environments such as data centers, commercial buildings, industrial facilities near offices, or any installation where audible noise and electromagnetic interference must be minimized without additional shielding or isolation measures.
What customization options and lead times are available for US-made PowerTower transformers?
Every PowerTower unit is fully custom-built in our Shelton, Connecticut facility to your exact requirements, including custom voltages, taps, single- or three-phase configurations, mounting options, and enclosures. As a domestic US manufacturer, we offer fast lead times and full supply chain transparency – a major advantage over overseas suppliers for projects requiring domestic content, Buy American compliance, or rapid deployment.
Contact our engineering team for a quote tailored to your voltage, kVA, and installation needs.
