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Distribution Transformers
Distribution Transformers

Single- and Three-Phase
  • Ventilated, NEMA 3R enclosure standard
  • Suitable for indoor or outdoor applications
  • Upright mounting only
  • 220ºC insulation system
  • 150ºC rise standard; 115°C or 80°C rise optional
  • Available in single-phase ratings 15–333 kVA
  • Available in single-phase ratings 25–167 kVA; in three-phase ratings 15–1500 kVA
Transformers that are currently specifically excluded from the scope of DOE 10 CFR Part 431 include:
  • Liquid-filled transformers below 10 kVA
  • Dry-type transformers below 15 kVA
  • AC and DC drives transformers
  • Rectifier transformers designed for high harmonics
  • Autotransformers
  • Non-distribution transformers, such as UPS transformers
  • Special impedance or regulation transformers
  • Regulating transformers
  • Sealed and non-ventilated transformers
  • Machine tool transformers
  • Welding transformers
  • Transformers with tap ranges greater than 15%
  • Transformers with a frequency other than 60 Hz
  • Grounding transformers
  • Testing transformers
Features, Benefits and Functions
  • 60 Hz operation (except as noted)
  • Short-term overload capability as required by ANSI
  • Meet NEMA ST-20 sound levels
  • Meet federal energy efficiency requirements for dry-type transformers effective as of January 1, 2010