Enhanced insulated wires provided with a tape winding coating to fulfill Class H (180ºC) thermal resistance requirements.

These products are ideal for downsizing transformers used in power supply equipment. In addition to round wires, rectangular wires are also available.


It is a coined word combining the acronym "Triple Indurated Wire" and "TOTOKU".


  • Highest thermal resistance of our lineup.
  • Product is finished to have a small outer diameter.
  • Insulation between the primary side and secondary side of transformers can be ensured.
  • Barriers, interlayer tape, and insulating tape are not required.
  • Coating strength can withstand for high-speed wire winding.


They can be used in environments requiring high thermal resistance such as high-temperature environments, or with power supplies whose heat generation is difficult to suppress. They are suitable for use in harsh operating environments such as in aviation and outer space applications.


Their triple-insulated structure allows them to be regarded as enhanced insulated wires from the perspective of safety standards.

Conductor configurations
  • Round wires
  • Rectangular wires

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