为了实现变压器的小型化、效率化、降低成本，古河电工配备有各系列的高频用途强化三层绝缘电线产品阵容。
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3层绝缘电线（强化绝缘电线）Standard Type TEX-ESolderable wire of single conductor and triple insulation layers. The layers are organized by heat resistant modified polyester and polyamide.
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3层绝缘电线（强化绝缘电线）Self-Bonding Type TEX-ECEW3Wire with additional self-bonding layer around TEX-E for bobbinless coils.
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3层绝缘电线（强化绝缘电线）Litz Type TEX-ELZWire organized by litz conductor and triple insulation layers for high frequency applications.
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3层绝缘电线（强化绝缘电线）Multi-strand wire TEX-ELZSA wire organized with an increased number of Litz conductors and triple insulation layers for even higher frequency applications.