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Low-voltage transformers
Totally Enclosed Non-Ventilated transformers
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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.
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Learn about dry-type transformers fundamentals
Voltage class
600V
Ratings
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)

View design guide (layouts, technical data and application information)

Download guide spec (16461)

Learn more about transformer family

Transformers Flex Center custom solutions

Learn how our Transformer Flex Center can help you meet unique general-purpose and distribution transformer needs that cannot be met with standard offerings

U.S. Department of Energy’s 2016 transformer efficiency changes

Discover the impact on inrush current for low-voltage dry-type transformers
Read white paper

Important aspects of dry-type distribution transformers

Explore best practices for the installation and inspection of dry-type distribution and power transformers
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