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What is "Class" in insulation of transformer winding coil?

Insulation class was the original method used to distinguish insulating materials operating at different temperature levels. Letters were used for different designations. Letter classifications have been replaced by insulation system temperatures in degrees Celsius. The system temperature is the maximum temperature at the hottest spot in the winding (coil). These systems are used by Acme Transformer for a large part of the product line.