The main difference is that the class designations refer to the withstand temperature of the insulation material in Tricast cast resin dry type transformers.  Thus, H class has a wihstand temperature level of 180 ⁰C for the coils and F class of 155 ⁰C for ambient design temperature of 40 ⁰C. 
Released for: Schneider Electric USA
Need help?
- Product Selector- Quickly and easily find the right products and accessories for your applications. 
- Get a Quote- Start your sales inquiry online and an expert will connect with you. 
- Where to buy?- Easily find the nearest Schneider Electric distributor in your location. 
- Help Center- Find support resources for all your needs, in one place.