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E3 premium efficiency-CSL-3 2007 final rule efficiency transformers Eaton Corporation''s E3 transformers represent the next level premium efficiency jump in the dry-type, three-phase ventilated transformer market, having a marked increase in energy savings over the standard NEMA TP-1 transformers being specified today. The E3 transformer represents the right choice for those looking for lowest energy/heat losses, green/LEED design and 24-hours-a-day, 7-days-a-week energy savings with no additional maintenance to maintain efficiency.