Totally Enclosed, Non-Ventilated (TENV)

Totally enclosed non-ventilated (TENV) transformers are an excellent 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.

Features and Benefits

  • 15-75kVA, Three-Phase
  • Quiet design - unique core and coil design
  • Core and coil assembly mounted on rubber isolation pads to reduce noise
  • Bolted coil terminations
  • 100% factory tested for shorts and coil integrity, current and loss, voltage, impedance and noise
  • Qualified to the seismic requirements of IEEE-693-1997 and IBC-2003
  • Copper ground strap
  • 220°C insulation system capable of 150°C rise, IS-19C
  • Copper or aluminum windings available
  • Available in 150°C, 115°C, and 80°C rise models
  • Indoor or outdoor use
  • NEMA TP-1 compliant
  • Dry-type transformer is housed in an enclosed NEMA 3R non-ventilated compartment
  • Convenient wiring compartment is located beneath the transformer and has removable front and rear covers
  • Copper bus bars are located at the front of the wiring compartment and are clearly labeled
  • All electrical connections between the transformer and bus bars are factory wired



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