Cast Resin Encapsulated Transformers

Cast Resin Transformers have at least one of the two windings embedded on an autoclave mould, at vacuum values close to zero with epoxy resin. The other winding can also be cast in epoxy resin or impregnated with H-class polyester resin with high cementation.

Cast Resin Transformers have reached a high degree of reliability thanks to the technological advances in recent years.

Our production E2, C2, F1, but also E3 (IEC 60076-16) and C4 (GOST-R), can be used in the presence of high humidity and pollution rates, low installation temperatures, even down to -60°C, therefore eliminating the problems related to the risks of fire and emissions of toxic and harmful substances in case of fire.

As they are entirely built with insulating, flame-retardant and self-extinguishing materials, they are completely free from all restrictions that should normally be applied to flammable equipment with a danger of spreading fire.

What is a Cast Resin Encapsulated Transformer?

A Cast Resin Encapsulated Transformer is built with at least one winding embedded in epoxy resin using an autoclave mould under near‑zero vacuum, forming a solid, protective insulation around the coil. The other winding is either cast in epoxy resin or impregnated with H‑class polyester resin with high cementation, delivering a compact, non‑flammable, self‑extinguishing unit that achieves a high level of reliability in modern applications.

How does a Cast Resin Encapsulated Transformer work?

Electrical energy is transferred between primary and secondary windings that are fully insulated by vacuum‑cast epoxy resin or high‑cementation H‑class polyester resin. This encapsulation stabilises the windings mechanically and electrically, shields them from humidity, pollution and dust, and prevents the spread of fire or toxic emissions if exposed to extreme events, ensuring dependable performance even in low‑temperature installations.

What are the benefits of a Cast Resin Encapsulated Transformer?

It offers proven reliability, high mechanical strength, and excellent resistance to humidity and pollution, with certified production classes E2, C2, F1, plus E3 (IEC 60076‑16) and C4 (GOST‑R). Built entirely from insulating, flame‑retardant, self‑extinguishing materials, it removes restrictions associated with flammable equipment and operates safely at low installation temperatures, even down to −60°C, without emitting harmful substances in case of fire.

Where are Cast Resin Encapsulated Transformers used?

They are chosen for sites that demand high safety and resilience, including areas with high humidity, heavy pollution or very low ambient temperatures. Typical applications include indoor and enclosed spaces where fire restrictions apply, as well as challenging environments where non‑flammable, self‑extinguishing equipment and reliable operation to −60°C are essential for compliance and continuity.