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What is the difference between Ventilated Transformers such as an EE15S3H and Sealed Resin Epoxy Encapsulated Transformers such as a 15S1F?

Transformers with similar Electrical Characteristics can vary in physical atttributes

Product Line:
LV Transformers

Applies to Ventilated and Sealed Resin Epoxy Encapsulated Transformers by SquareD/Schneider Electric

Various Transformer designs exist for use in different environments and applications


There is virtually no performance difference between equivalent kVA and voltage ratings. The difference however is mechanical and thermal.
Sealed Resin Epoxy Encapsulated Transformers are constructed using Nema 3R enclosures as standard (with NEMA 4X available) . Mounting brackets are integral to the design.  Sealed Resin Epoxy Encapsulated Transformer units have a 180 C insulation with standard 115C rise with an 80C rise option .
Ventilated Transformers are rated NEMA 2. Adding the optional weathershield can provide a NEMA 3R rating.  Mounting brackets are also separate.
Ventilated units utilize a 220C insulation system with 150C rise standard and 115C and 80C options.


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