PEAK Single-Phase Overhead Transformer


PEAK™ transformers from Cooper Power Systems 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 5-167 kVA
Average Winding Rise (AWR) 75 °C
Average Winding Rise (AWR) Slash Ratings 55/75 °C and 65/75 °C
Overload Capacity At Least 109%
Approx. Weight (lbs.) 220 (5 kVA) to 1350 (167 kVA)


  • Meet or exceeds ANSI and NEMA standards
  • Meets DOE Energy Efficiency
  • Standard 10 CFR Part 431 for distribution transformers
  • EPRI recommended interlaced coretype design (5-75 kVA)
  • Tank coating exceeds IEEE Std C57.12.31™-2002 standard
  • Cover with a minimum dielectric strength of 8 kV
  • Tin-plated high and low-voltage bushing terminals to accommodate aluminum or copper conductors
  • Laser-engraved nameplate
  • Wet process porcelain high-voltage bushings resistant to high-voltage corona
  • Tank grounding provisions
  • Filled with Envirotemp™ FR3™ fluid
  • Heavy-duty lifting lugs and hanger brackets per ANSI requirements
  • Visible cover ground on units with cover-mounted bushings
  • Recessed tank bottom that offers protection when sliding over rough surfaces
  • Automatic pressure relief device
  • Polymer low-voltage bushings (5-75 kVA)
  • Arrester mounting and grounding provisions
  • Internal mark indicating the proper oil level
  • Permanently stamped secondary leads to ensure proper identification
  • Corrosion-resistant cover band
  • Quality System ISO 9001 certified

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