Non-Ventilated Resin-Encapsulated Transformers (H-Class Insulation)
ET Series
Non-Ventilated Resin-Encapsulated Transformers (with H-Class insulation) are characterized by a reduced noise level compared to ordinary dry-type or cast-resin transformers. Compact and installable in a number of different ways, these transformers are furthermore self-extinguishing. With a durable IP20 enclosure, these transformers come in Regular Type and "Silent" Type, for the lowest sound levels. Optional accessories include protective devices for overload and over-temperature protection. SPD for protection against lightning is also available.
About the Product
In 1992, CIC became the first manufacturer in Taiwan to successfully produce a non-ventilated low-voltage transformer. To create this product, the main transformer components were placed in a metal enclosure and then insulated — encapsulated — with an epoxy resin mixture. The heat dissipation allowed by the solidified epoxy resin mixture and by the surface area of the metal enclosure made the compact size of the transformer possible. These transformers also had a reduced noise level — compared to ordinary dry-type or cast-resin transformers — and could be installed in a number of different ways, facilitating the economical use of space. The fire-resistant design further enabled these products to widely replace the oil-immersed transformers and tape-insulated dry-type
transformers that were frequently used in large buildings and shopping centers at the time. This non-ventilated LV transformer has since been enhanced with new features, including temperature monitoring and overload protection, and has become even more widely adopted. Ideal for commercial, office, medical, and residential buildings alike, these transformers are installed also in Taipei 101, Taiwan’s tallest building.
Product Features
- Transformer cores made with high-permeability cold-rolled grain-oriented silicon steel sheets (CRGO) for high efficiency.
- Windings are made with copper or aluminum conductors.
- H-Class insulation for high safety and reliability.
- Self-extinguishing, low-noise, and protected against moisture, dust, and pests.
- Durable IP20 enclosure helps prevent electric shocks.
- Compact size. Installable in multiple ways.
- Available in Regular Type and “Silent” Type (for the lowest sound levels).
- Optional SPD for protection against lightning.
- Optional protective devices for overload and over-temperature protection.
Specifications
- Standards: IEC (or specific national standards by request)
- Number of Phases: 3 (single-phase products available upon request).
- Frequency: 50 or 60Hz
- Primary Voltage: ≤ 480V
- Secondary Voltage: 190Y/110V or 208Y/120V
- Connection Type: Δ–Y, or as specified by customers
- Capacity: 3 ~ 75 kVA
- Cooling Method: Air Natural (AN)
- Other specifications or custom requirements available.
Drawings and Selection Tables
Overload and Over-Temperature Protection Devices (Optional)
Note: For wiring diagrams, please refer to the full brochure of these protective devices, provided upon request.
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CIC Company Profile
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【Product Brochure】Non-Ventilated Resin-Encapsulated Transformers (H-Class Insulation)
3-page brochure, with product description, specifications, drawings, and information on 3 types of protective devices.
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