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Totally Enclosed, Non-Ventilated (TENV)

ABB Totally Enclosed Non-Ventilated Transformers

Totally enclosed non-ventilated (TENV) transformers are a smart choice for applications where dry-type transformer benefits are desired but the standard enclosure openings are unacceptable because of adverse atmospheric conditions. TENV transformers are recommended where dust, dirt, or lint may be present or where transformers are subject to sprays or controlled wash-down conditions. They are UL Listed through 75kVA for indoor or protected outdoor applications. TENV transformers meet NEMA TP-1 efficiency.


  • Quiet performance- meets NEMA ST-20
  • Easy access for installation and service


  • Convenient wiring compartment is located beneath the unit and has removable front and rear covers
  • Copper bus bars located at the front of the wiring compartment and are clearly labeled
  • Bolted coil termination design
  • Core and coil assemblies mounted on rubber isolation pads
  • Copper ground strap

Technical specifications

  • 15 – 75 kVA
  • Three-phase
  • Copper or aluminum windings
  • NEMA 3R (IP22) enclosure, indoor or outdoor use

Certifications and standards

TP-1 efficiency


  • Textile
  • Automotive
  • Foundry
  • Paper mills
  • Wash-down areas