Cast Resin Transformers

Protrafo's cast resin transformers

Exceptional quality and efficiency

Protrafo’s cast-resin transformers combine premium quality, safety and efficiency with excellent resistance to moisture, dust and temperature extremes. Their maintenance-free design and low energy losses ensure long-lasting, sustainable performance in a wide range of indoor and sensitive environments.

Smart Monitoring Systems: Our cast resin transformers can be equipped with intelligent monitoring solutions that track key parameters like temperature and load in real time — enabling predictive maintenance and improving operational safety across a range of environments.
ECODESIGN Compliant Efficiency: Designed to meet TIER2 ECODESIGN standards, our transformers are built for sustainability, offering exceptional energy efficiency with significantly reduced environmental impact.
Moisture-Resistant Resin Insulation: Each transformer is cast using high-quality epoxy resin under vacuum, eliminating air pockets and moisture. This ensures excellent insulation, dielectric strength, and long-term reliability in both dry and humid conditions.
Silent and Efficient Operation: Engineered for low sound emissions and minimal energy losses, our transformers are ideal for urban and noise-sensitive environments without compromising performance.
Clean and Safe for Demanding Environments: With no oil or flammable liquids, our cast resin transformers offer a fire-safe and environmentally friendly solution — ideal for indoor use in clean rooms, hospitals, and high-tech production facilities. Their dry-type design ensures safe, low-risk operation in environments where safety, hygiene, and reliability are essential.
Safety-First Protection Features: Advanced safety features — including temperature sensors, thermal protection systems, and self-extinguishing insulation — ensure safe and reliable operation, protecting both personnel and infrastructure.

Why choose Protrafo?

From Design to Delivery

A Proven Process You Can Rely On

At Protrafo, every transformer goes through a streamlined process — from engineering to delivery. Each step is handled by specialists to ensure top quality and reliability.

Engineering and Production

Each transformer is engineered crafted with care in state-of-the-art facilities. Our production team follows strict quality standards to ensure durability, efficiency, and long-lasting performance.

Testing

Before any transformer leaves our facility, it undergoes extensive testing. Our engineers verify every detail to guarantee optimal safety, performance, and compliance with international standards.

Precision Supply Chain, Logistics and Delivery

We coordinate every shipment with precision. Whether it’s local or international, our logistics partners ensure your transformer arrives safely, on time, and ready for installation.

Frequently Asked Questions

Frequently Asked Questions and question about Cast Resin Transformers

Cast resin (dry-type) transformers require minimal maintenance. Routine visual inspections, dust removal, and checking for signs of overheating or insulation wear are usually sufficient. Unlike oil-filled units, they do not require oil testing or leak monitoring, making them ideal for low-maintenance environments.

Dry-type transformers use air for cooling and solid insulation, making them suitable for indoor environments where fire safety is a concern. Oil-filled transformers use liquid insulation and oil for cooling, offering higher efficiency, better overload capacity, and longer lifespan. They are typically used outdoors or in high-power applications. Each type is chosen based on the specific safety, performance, and environmental requirements of the installation.

For indoor installations, cast resin (dry-type) transformers are typically preferred. They are fire-safe, require minimal maintenance, and are well-suited for environments like commercial buildings, hospitals, and industrial facilities. Unlike oil-filled transformers, they do not require special containment for leaks or ventilation for flammable gases.

The typical lifespan of a transformer ranges from 25 to 40 years, depending on the type, load conditions, maintenance, and operating environment. With proper care and monitoring, such as using systems like Protrafo Insights®, transformers can operate reliably for several decades.

Yes, we provide on-site coordination and, if required, technical assistance to ensure a smooth installation process.