PEAK Three-Phase Pad-Mounted Transformer


Eaton’s Cooper Power series PEAK™ transformers are uniquely designed to allow you additional capability to manage increased loads and temporary overload capacity without loss of life expectancy when compared to mineral oil-filled transformer alternatives.

Utilizing an advanced high-temperature insulation system approach — comprised of thermally upgraded kraft paper, Envirotemp™ FR3™ dielectric fluid, and an optimized core and coil design — a 75 °C Average Winding Rise (AWR) PEAK transformer results in a smaller footprint and a lighter unit capable of the same ratings as a physically larger 65 °C AWR rated unit.

Ratings 45 - 12,000 kVA
Average Winding Rise (AWR) 75 °C
Average Winding Rise (AWR) Slash Ratings 55/75 °C and 65/75 °C
Overload Capacity At Least 112%
Primary Voltage 2,400 – 46,000 V
Secondary Voltage 208Y/120 V to 14,400 V
Specialty Designs Inverter/Rectifier Bridge; K-Factor (up to K-19); Solar/Wind Designs; Differential Protection; Seismic Applications (including OSHPD)


  • Meet or exceeds ANSI/IEEE and NEMA standards
  • Meets DOE Energy Efficiency Standard 10 CFR Part 431 for distribution transformers
  • Envirotemp™ FR3™ fluid
  • Tank coating exceeds IEEE Std C57.12.28™-2005 and C57.12.29™-2005 standards (stainless steel units only)
  • Full compliance with IEEE Std C57.12.28™-2005 standard enclosure integrity requirements
  • Laser engraved nameplate
  • Recessed stainless steel lifting provisions
  • Tank grounding provisions
  • Automatic pressure relief device
  • Hinged door with stainless steel hinge pins and barrels
  • Floating lock pocket for easy alignment
  • Captive stainless steel pentahead door locking bolt
  • Oil fill and drain provisions
  • Removable sill
  • Welded domed tank cover
  • 200 A bushing wells (15, 25, 35 kV)
  • 200 A, 35 kV large Interface
  • 600 A (15, 25, 35 kV) integral bushings (dead-front)
  • Electrical-grade wet-process porcelain bushings (live-front)
  • Ground strap from X2 to tank ground
  • Tamper strips of noncorrosive material
  • Decal bushing designations
  • Quality System ISO 9001 certified

Envirotemp™ and FR3™ are licensed trademarks of Cargill, Incorporated.