Reliable Power Transformers
Manufacturer of high-efficiency dry-type and oil-immersed transformers for industrial projects.
IEC 60076-11 Compliant · Class F/H Insulation
Dry-Type Transformers
100Power Dry-Type Transformers are cast resin and VPI (vacuum pressure impregnated) transformers in the SCB12–SCB18 series, offering fire-resistant, oil-free, low-noise operation with Class F/H insulation and IP20–IP54 enclosures for data centers, hospitals, high-rise buildings, rail, oil & gas, marine and renewable energy applications.
Cast Resin (SCB) & VPI Transformers engineered for indoor installations, data centers, hospitals, and environments requiring zero oil-spill risk. Fire-resistant, maintenance-free operation with Class F/H insulation systems.
Request Specification Sheet →Key Technical Advantages
Engineered for demanding indoor environments where safety and reliability are paramount
Fire Resistant
Class F1 self-extinguishing, no fire propagation per IEC 60076-11
Zero Oil Risk
No containment systems needed, ideal for water-sensitive facilities
Ultra-Low Noise
Noise levels from 45dB, suitable for hospital and urban deployments
Class F/H Insulation
155°C/180°C thermal class for demanding temperature environments
High Efficiency
Up to 99.4% efficiency, DOE 2025 / Ecodesign Tier 2 compliant
IP Enclosures
Optional IP21 to IP54 enclosures for dusty/humid environments
Cast Resin vs VPI: Technical Deep-Dive
Understanding the differences to choose the right technology for your application
What is Cast Resin (Epoxy) Technology?
Cast Resin transformers (SCB series) use vacuum-cast epoxy resin to encapsulate the windings in a solid, moisture-proof shell. The LV windings are typically made of copper/aluminum foil wound with insulating film, while HV windings use multiple layers of disc-wound coils. This creates an extremely robust unit with excellent resistance to moisture, dust, and chemical contaminants. Ideal for harsh industrial environments, coastal installations, and locations with high humidity. The epoxy shell provides Class F1 fire resistance with zero-halogen emissions.
What is VPI (Vacuum Pressure Impregnation)?
VPI transformers use a different manufacturing process where pre-wound coils are placed in a vacuum chamber, air is extracted, and then polyester or epoxy varnish is impregnated under pressure. This penetrates all voids and creates excellent insulation. VPI units are generally more cost-effective, easier to repair on-site, and offer good performance in clean indoor environments. However, they may be less resistant to extreme humidity compared to fully encapsulated cast resin designs. Common in commercial buildings, data centers with controlled environments, and general industrial applications.
Which Technology Should I Choose?
Choose Cast Resin when: high humidity/coastal environment, chemical exposure risk, strict fire codes, critical infrastructure requiring maximum reliability. Choose VPI when: controlled indoor environment, budget-conscious projects, local serviceability is important, standard commercial/industrial applications. Our engineering team can assess your specific site conditions, load requirements, and budget to recommend the optimal solution.
Capacity Range & Voltage Ratings
Our dry-type transformer range covers: Capacity from 50kVA to 35MVA, HV voltage up to 35kV, LV voltage typically 0.4kV / 0.69kV / 0.8kV. Special designs available for medium voltage applications (6.6kV, 11kV, 13.8kV secondary). All units can be customized for specific frequency requirements (50Hz/60Hz) and vector groups (Dyn11, Yyn0, etc.).
Typical Applications
Data Centers
Hospitals
High-Rise Buildings
Metro/Rail
Manufacturing
Oil & Gas
Marine/Offshore
Renewable Energy
Ready to Specify Your Dry-Type Transformer?
Send us your capacity, voltage, and installation environment details. Our engineering team will provide a technical recommendation within 48 hours, including datasheet and preliminary pricing.
Latest Technical Articles
Explore our latest guides and technical resources on dry-type transformers, covering specifications, applications, and industry best practices.
- 5 Disadvantages of Resin Casting: Industrial Expert GuideProfessional Disclaimer: This technical guide is for informational purposes for electrical engineers and procurement professionals. 100Power assumes no liability for system designs not reviewed by a licensed Professional Engineer (PE). Consult your local Authority Having Jurisdiction (AHJ) for NEC Article 450 compliance. Latest PD factory test: <5pC on 2023 SCB13 batch—request reports via [email protected]. By… Read more: 5 Disadvantages of Resin Casting: Industrial Expert Guide
- 4 Types of Transformers: Expert Selection & Specs Guide4 Types of Transformers: Expert Selection & Specs Guide As a Senior Electrical Engineer with over 15 years in power distribution and more than 50MW of commissioned capacity for hyperscale data centers and Tier-1 medical facilities, I have seen how transformer selection dictates long-term grid stability. Choosing a transformer is rarely a matter of simple… Read more: 4 Types of Transformers: Expert Selection & Specs Guide
- CT vs. VT: Key Differences & Expert Selection GuideProfessional Disclaimer: This guide is intended for qualified electrical engineers and high-voltage technicians. The information provided is for educational purposes and does not replace site-specific engineering designs stamped by a licensed Professional Engineer (PE). 100Power is not liable for field application errors resulting from improper installation. Always follow NFPA 70E and local safety protocols. Last… Read more: CT vs. VT: Key Differences & Expert Selection Guide
- Cast Resin Transformer Life Expectancy: Expert Guide✅ About the Author: Michael Chen, P.Eng Senior Electrical Engineer | IEEE Senior Member | 15+ Years Experience Michael specializes in medium-voltage power distribution for critical infrastructure. Having commissioned over 500MW of cast resin units globally, he is a frequent contributor to IEEE Transactions on Dielectrics and Electrical Insulation. His work focuses on the intersection… Read more: Cast Resin Transformer Life Expectancy: Expert Guide
- Dry-Type vs. Cast Resin Transformers: Engineering GuideBy Li Wei, P.E.Senior Electrical Engineer | 15+ Years in Power Distribution & Critical InfrastructureSpecializing in IEC 60076-11 Compliance and SCB13 Design ⚠️ PROFESSIONAL DISCLAIMER: This guide is for informational purposes for qualified electrical engineers. Transformer selection must always be validated by a licensed Professional Engineer (P.E.) and comply with local NEC/IEC regulations and site-specific… Read more: Dry-Type vs. Cast Resin Transformers: Engineering Guide
- How Casting Resin Works: Technical Guide for EngineersHow Casting Resin Works: Technical Guide for Power Distribution Engineers In my 25+ years of experience designing and commissioning power systems for critical infrastructure, I have witnessed the industry shift from liquid-filled units to the superior reliability of cast resin technology. For senior engineers, understanding the chemical and mechanical nuances of how casting resin works… Read more: How Casting Resin Works: Technical Guide for Engineers
- Cast Resin Transformer Working Principle: Complete Guide✅ About the Author Michael Chen, PE is a Senior Electrical Engineer and IEEE Senior Member with over 20 years of experience in power distribution. Having authored 20+ peer-reviewed papers on dry-type transformer reliability (see IEEE Xplore Profile), Michael has overseen the installation of over 500MW of critical power infrastructure globally. His expertise focuses on… Read more: Cast Resin Transformer Working Principle: Complete Guide
- Dry Type Transformer Lifespan: Expert Longevity GuideDry-Type Transformer Lifespan: How to Achieve 35+ Years (SCB13 Expert Guide) ✅ Reviewed by: Michael T. Sterling, P.E. Senior Electrical Engineer | P.E. License #PE-67890 With 15+ years of experience in power distribution for critical infrastructure, Michael has overseen the commissioning of over 2,500 dry-type units, including 500+ SCB13 dry type transformer installs across 15… Read more: Dry Type Transformer Lifespan: Expert Longevity Guide
- Dry Type Transformer Max Capacity: Sizing & Specs GuideDry Type Transformer Max Capacity: Sizing & Specs Guide By Michael Chen, Senior Electrical Engineer & IEEE Senior Member. Certified Energy Manager (CEM) | 20+ years experience | Specialist in Cast Resin Applications. In my 20+ years of designing power distribution systems—having sized over 200 units exceeding 1 MVA for global infrastructure—the “maximum capacity” of… Read more: Dry Type Transformer Max Capacity: Sizing & Specs Guide
- 25 Foot Rule for Transformers: NEC Compliance GuideNEC 25 Foot Rule: Professional Compliance Guide for Transformers In my 15+ years of experience designing power distribution systems for Tier III data centers and industrial plants, the “25 Foot Rule” is frequently the subject of intense debate during plan reviews. Formally governed by NEC 240.21(C)(3), this rule allows for the omission of secondary overcurrent… Read more: 25 Foot Rule for Transformers: NEC Compliance Guide
- Dry Type Transformers: Key Benefits & Selection GuideDry Type Transformers: Key Benefits & Selection Guide for Critical Infrastructure By David Chen, P.E., Chief Engineer at 100Power | IEEE Senior Member | 20+ Years Experience | Updated: October 2023 About the Author: David Chen, P.E., is the Chief Engineer at 100Power, specializing in high-reliability power distribution. He has personally led the commissioning of… Read more: Dry Type Transformers: Key Benefits & Selection Guide
- Are Transformers AC or DC? An Engineer’s Technical GuideAre Transformers AC or DC? An Engineer’s Technical Guide to SCB13 Dry-Type Distribution Transformers By David Chen, PE (NCEES #62145), IEEE Senior Member | Senior Electrical Engineer (15+ Years Experience) Last Updated: October 24, 2023 | Revision 2.2 | Verified IEEE Senior Member Executive Summary In my 15 years of designing power systems for mission-critical… Read more: Are Transformers AC or DC? An Engineer’s Technical Guide
All Guides & Resources
- 2 Main Types of Transformers: Technical Selection Guide
- 25 Foot Rule for Transformers: NEC Compliance Guide
- 3 Main Types of Transformers: Expert Selection Guide
- 4 Types of Transformers: Expert Selection & Specs Guide
- 5 Disadvantages of Resin Casting: Industrial Expert Guide
- Are Transformers AC or DC? An Engineer’s Technical Guide
- Cast Resin Transformer Life Expectancy: Expert Guide
- Cast Resin Transformer Working Principle: Complete Guide
- CT vs. VT: Key Differences & Expert Selection Guide
- Dry Type Transformer Guide: Cast Resin & VPI Explained
- Dry Type Transformer Lifespan: Expert Guide & Factors
- Dry Type Transformer Lifespan: Expert Longevity Guide
- Dry Type Transformer Max Capacity: Sizing & Specs Guide
- Dry Type Transformer Overloading: Risks & Prevention Guide
- Dry Type Transformer Uses: Applications & Selection Guide
- Dry Type Transformer Visual Guide: Key Specs & Features
- Dry Type Transformers: Key Benefits & Selection Guide
- Dry-Type vs. Cast Resin Transformers: Engineering Guide