What is encapsulated transformer?

Encapsulated (Potted) power Transformers (also referred to as Epoxy Resin Encapsulated) are designed for applications where the environmental conditions would not permit a general purpose ventilated dry type transformer. The entire transformer core & coil is encased in a silica sand / polyurethane mixture which protects the windings from any airborne contaminants and moisture. Encapsulated units are covered in a thicker coating of insulation than typical. Often the coils are completely encased in epoxy or an epoxy and aggregate mixture. Sometimes they are referred to as “potted” or “cast coil”.The encapsulated design is especially suited for installations in harsh environments where dust, lint, moisture and corrosive contaminants are present. Typical applications include: pulp and paper plants; steel mills; food processing plants; breweries; mines; marine and shipboard installations.

We offer customer design and engineering support for our customers. Please Contact Us for more details.We not only provide Encapsulated Power Transformers,but also isolated transformers, encapsulated transformers, 50/60Hz transformers and inductors.Get a quotation.


1. Different range of frequency from 10kHz to 500kHz

2. Power: 0.35VA -40VA

3.Encapsulated with electrical grade resin

4.Cores of high quality electrical steel

Features Of Encapsulated Power Transformers

Encapsulated Power Transformerss are specifically excluded from the scope of U.S. DOE energy efficiency requirements

Encapsulated Power Transformerss are available  in aluminum or copper windings

Standard 115°C temperature rise; 80°C optional. Insulation class 180°C

Optional low-sound 3dB and 5dB below NEMA ST-20 standard

Available in 60 and 50 Hz

Standard NEMA 3R enclosures

Cores are grounded with a copper lead


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Benefits Of Encapsulated Power Transformers

Mixture of silica sand resin forming a solid mass completely encloses and protects the core and coil, also significantly reduces audible noise.

Windings utilize Class 220°C Insulating rated for 150°C Rise, but designed to operate at 115°C maximum.

The transformer's core is solidly grounded.

Enclosure constructed from heavy gauge steel, coated with ASA#61 grey powder paint

Suitable for NEMA/CSA Type 3R and Type 4 Enclosure applications for both indoor and outdoor

Spacious wiring compartment, cool and easily accessible (bottom or front access may depend on size)

Applications Of Encapsulated Power Transformers

For all general loads, indoors or out, including lighting, industrial and commercial applications

Units may be banked for 3-Phase operations

Corrosive Environments: Petro-Chemical, steel, pulp and paper industries

Damp conditions: Mines, pump-houses underground or rooftop service areas

Industrial applications: processes with high degree of airborne dust or conductive particles


Sitong is a professional Encapsulated Power Transformers Manufacturer which we have kept supplying a variety of electronic parts to many foreign importers in United States, South Korea, Russia and others. Welcome to choose Encapsulated Power Transformers when you free. We also have Low Frequency Transformer for sale. Besides,we can be customized according to customer requirements.

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