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Totally Enclosed Non-Ventilated transformers

Totally enclosed non-ventilated transformers are highly suited for applications where the atmosphere contains conductive, corrosive, or combustible materials which might damage a transformer, or lint and dust which might block the ventilation passages. With no openings in the enclosure, heat is dissipated by radiating from the surface area of the enclosure.
Totally Enclosed Non-Ventilated transformers
Voltage class
Single-phase 15 - 167 kVA Three-phase 15 - 1000 kVA
Winding conductor
Aluminum or copper

Core features

  • Totally enclosed non-ventilated transformers are specifically excluded from the scope of U.S. DOE energy efficiency requirements
  • Standard NEMA 3R enclosure; optional 3RX, 4, 4X, and 12 (X suffix enclosures ratings made of stainless steel)
  • Includes  copper or aluminum windings
  • Available in 80°, 115° and 150° C rise designs
  • Provides versatility for indoor/outdoor applications
  • Transformers include a versatile bonding/grounding bar affixed to the bottom panel as standard, to provide compliance with NEC 450.10(A)

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