Download document () of 20
Clear selection
Download selection
United States Select your location
Submit form in new Tab
We make what matters work*
Submit form in new Tab
Products
Digital
Services
Markets
170961867
Industry-first collaboration
Learn how we’ve joined forces with Siemens Energy to fast-track data center construction and reduce deployment timelines by up to two years.
Support
1010067800
Part number search >
Search for catalog numbers
Company
Fibrebond module crane
Eaton completes acquisition of Fibrebond
04/01/2025
MyEaton
Quick links

Medium-voltage transformers

PEAK single-phase overhead transformer

Eaton’s Cooper Power series single-phase overhead PEAK transformers provide the capability to manage increased loads and temporary overload conditions without accelerating loss of insulation system life, compared to mineral oil-filled alternatives. The transformers’ overload capacity enables utilities to operate beyond full-rated load to at least 109 %, while their smaller, lighter footprint further enhances value.

Contact me about this solution
PEAK transformer product aid PEAK single-phase overhead distribution transformer catalog
Back to search
Voltage class
5-167 kVA
Average winding rise (AWR) / slash ratings
75˚ C / 55/75 °C and 65/75 °C
Primary voltage
2400-34,500 V

The smart choice

Cargill's FR3 dielectric fluid provides superior transformer performance, safety and environmental friendliness.

Learn more

Core features

  • PEAK transformers are designed to improve performance with longer insulation life and offer compact dimensions, lighter weight, safety and sustainability
  • Superior moisture and thermal stress managing capabilities allow for extended insulation system life and enhanced reliability
  • Utilizes an advanced high-temperature insulation system comprised of thermally upgraded kraft paper, FR3 dielectric fluid and an optimized core and coil design
  • Available in 5-167 kVA single-phase pole-mount designs; 75 °C AWR and 65/75 °C AWR options
  • 75 °C Average Winding Rise (AWR) of PEAK transformer offers the same ratings as a physically larger and heavier 65 °C AWR rated unit
  • A 65/75 °C slash rated PEAK transformer is comparable in size to a conventional transformer but has nameplated overload capability
  • Meets or exceeds industry standards including ANSI, NEMA and DOE Energy Efficiency
  • Available in conventional or CSP designs for various overcurrent protection options
  • Cores and coils designed for high reliability and low field failure rates: Available in grain-oriented electrical or amorphous steel

Better manage temporary overload capacity

PEAK single-phase transformers can be loaded continuously 9% beyond full-rated base load, helping utilities to more precisely size transformers based on periods of peak demand — without accelerated reduction of insulation life.

Gain additional load capacity

Designed to accommodate heavier base loading for longer periods without accelerating loss of insulation system life, PEAK single-phase transformers can be loaded continuously 9% beyond full rated base load.

Improve reliability

With superior moisture and thermal stress managing capabilities, PEAK transformers extend insulation system life, improving overall system reliability by reducing outages and transformer failures.
Specifications

Ratings

  • PEAK 50 or 60 Hz (5-167 kVA)
    • Overload capacity: At least 109%
    • Standard with FR3 dielectric fluid
    • Primary voltage: 2400-34,500 V
    • Secondary voltage: 120-600 V

Specifications

  • Meets or exceeds ANSI, NEMA and DOE2016 standards
    • IEEE, C57.12.00, C57.12.20, C57.12.31, C57.12.35, C57.12.90, C57. 91 and C57.154
    • NEMA standards, NEMA TR 1 (R2000)
    • Department of Energy Efficiency Standard, 10 CFR Part 431
  • Tank coating exceeds IEEE Std C57.12.31-2010 standard
  • Cover with a minimum dielectric strength of 8 kV
  • FR3 fluid
  • Cores and coils designed for high reliability and low field failure rates: Available in grain-oriented electrical or amorphous steel
  • Heavy-duty lifting lugs and hanger brackets per ANSI requirements up to 4500 lbs
  • The transformer shall be designed in accordance with this specification and shall have an Average Winding Rise (AWR) of one of the following:
    • 55/75 °C, 65/75 °C, 75 °C
    • The applicable AWR rating shall be specified on the inquiry
  • The transformer shall be designed in accordance with this specification and shall have one of the following kVA ratings:
    •  5, 10, 15, 25, 37.5, 50, 75, 100, 167
    • The applicable kVA rating shall be specified on the inquiry
  • Quality System ISO 9001 certified
Download Links
  • Commercial and industrial medium-voltage electrical distribution products brochure
    This brochure outlines Eaton’s Cooper Power series broad commercial and industrial medium-voltage transformer, switchgear, fuse, sectionalizer, switch, regulator, tool, OEM equipment, cable accessory, lightning arrester, power capacitor and recloser offerings.
    (PDF 2 MB , 01/24/2023)
  • PEAK transformer product aid
    This brochure describes why Eaton’s Cooper Power series PEAK transformers are uniquely designed to provide additional capability for managing increased loads and temporary overloads without accelerating loss of insulation system life when compared to mineral oil-filled transformer alternatives.
    (PDF 249 KB , 03/01/2015)
  • Storm season rapid response information
    Eaton’s Cooper Power series product team works together with the engineering services team to provide a full storm response procedure to quickly ramp up operations in anticipation of storm impact for fast product shipment and remediation of damaged apparatus during storm recovery.
    (PDF 619 KB , 07/25/2019)
  • PEAK single-phase overhead distribution transformer catalog
    This catalog provides ratings and ordering information for Eaton’s Cooper Power series single-phase PEAK transformers which are available as conventional (5-167 kVA), completely self-protected (CSP) (5-75kVA) or MagneX interrupter-protected (5-167 kVA).
    (PDF 143 KB , 08/01/2015)
X
Download Close

New to transformers?

Learn about the fundamentals of medium-voltage transformers

Learn more

Emergency and storm shipments

In the wake of a storm or disaster, Eaton understands that safety and speed of response is everything. You can rely on Eaton Care teams to plan, protect and connect.

Contact and process information

Related products

Contact me
Phone
877-277-4636 or 877-ETN-CARE
Locate a channel partner
Eaton is an intelligent power management company dedicated to improving the quality of life and protecting the environment for people everywhere. We are guided by our commitment to do business right, to operate sustainably and to help our customers manage power ─ today and well into the future. By capitalizing on the global growth trends of electrification and digitalization, we’re accelerating the planet’s transition to renewable energy and helping to solve the world’s most urgent power management challenges.
Company
Quick links
© 2025 Eaton. All Rights Reserved.