My new Transformer has an odor or `burning smell` after energization. Is it defective?

Issue:
New Transformer odor

Product Line:
LV  Transformers

Environment:
Applies to Low Voltage Transformers by SquareD/Schneider Electric

Cause:
Varnish impregnation

Resolution:

It`s normal for new Transformers to release some harmless odors from the varnish impregnation used in the coils for a week or two after energization. Older Transformers can also release some odor if loaded to a higher level than they have experienced previously in their history. Problems within Low Voltage Dry Type Transformers will typically result in immediate tripping of upstream circuit protection. If your Transformer is otherwise operating normally, and the load current does not exceed the nameplate capacity rating, then it is unlikely that your Transformer is defective.