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The temperature corresponding to the heat-resistant level of the insulation material refers to the temperature at which the insulation material of this grade is allowed to work continuously for a long time (do not be understood as the highest working temperature of the insulation material).

Class Y: Insulation structure consisting of unimpregnated cotton yarn, silk and paper or other materials or combinations thereof at 90 °C

Grade A: 105°C with insulation structure impregnated or immersed in a liquid dielectric (such as cotton yarns, wire and paper, or combinations thereof in transformer oil)

Grade E: 120°C Insulation structure composed of a combination of synthetic organic film, synthetic organic enamel and other materials

Class B: Insulation structure consisting of mica, glass fiber, asbestos, etc. bonded or impregnated with a suitable resin, and other inorganic materials, suitable organic materials, or combinations thereof at 130°C

Class F: 155°C Insulation structure consisting of mica, glass fiber, asbestos, etc. bonded or impregnated with a suitable resin, coated with other inorganic materials, suitable organic materials, or combinations thereof

Grade H: 180°C Insulation structure consisting of mica, glass fiber, asbestos, etc., or combinations thereof, bonded or impregnated with a suitable resin (such as silicone resin)

Grade C: 180°C or more Insulation structure consisting of mica, glass fiber, and unimpregnated mica, ceramics, quartz, etc., or combinations thereof, bonded or impregnated with a suitable resin, coated mica, glass fiber, etc.