Insulation Thermal Rating

Insulation materials are classified according to IEC standards into insulating classes showing the corresponding maximum working temperatures that must not be exceeded at any point of the winding. The table below outlines the recognized insulation classifications.

Only the mentioned are those insulating materials directly concerned with Transwire:

Class Temperatures oC Insulating Materials
Y 90 Paper not impregnated
A 105 Paper if impregnated
E 120 Polyvinyl Formel – polyurethane enamels
B 130 Fibre-glass impregnated – Modified polyurethane enamels
F 155 Fibre-glass impregnated in polyester and epoxy resins – Modified polyurethane enamies
H 180 Polyesterimide enamels – Fibre-glass impregnated in class H varnishes
C 200 NOMEX* Fibre-glass impregnated in silicon resins. Polyamide-imide enamels.
220 PI Film

* Du Pont De Nemours & Co USA Trademark

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DISCLAIMER: The technical information contained herein is the result of extensive testing in the manufacturer’s laboratories. In addition any application advice given verbally, in writing or by testing corresponds to the best of our knowledge and belief. Since the use and application of any of our products lies beyond our area of control, it remains the responsibility of the user to verify the product’s suitability for their application.

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