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Conventional single-phase overhead transformer

Eaton's Cooper Power series single-phase conventional overhead transformers are designed for exceptional performance. Available in ratings from 5-167 kVA, the transformers are designed with an interlaced core (5-50 kVA), which is recommended by the Electric Power Research Institute (EPRI). Conventional transformers meet or exceed the requirements of applicable ANSI and NEMA standards. Single-phase overhead transformers can be filled with standard electrical grade mineral insulating oil or fire-resistant Envirotemp FR3 fluid.

Conventional single-phase overhead transformer
Primary voltage
2400-34,500 V
Secondary voltage
120-600 V

Core features

  • Available option of Envirotemp FR3 fluid for increased fire safety or electrical grade mineral oil
  • Meets or exceeds industry standards including ANSI, NEMA and DOE Energy Efficiency
  • Constructed with EPRI-recommended interlaced core-type design for greater resistance to low-side voltage surges
  • Polymer low-voltage bushings are standard at 5-50 kVA
  • Cores and coils designed for high reliability and low field failure rates: Available in grain-oriented electrical or amorphous steel
  • Domed cover design and formed cover band provide increased pressure withstand capability, eliminate bushing overhang and improve cover retention
  • High-voltage bushing design improves gasket protection and seal
  • Configurable to Rural Utilities Service (RUS) specification

Optimum field performance

Eaton's Cooper Power series transformer cores and coils are designed and manufactured to provide the most reliable performance and the industry’s lowest failure rate. Advanced quality management, combined with exhaustive testing, assures unparalleled reliability and operation.

The safer, environmentally friendly choice

Single-phase conventional transformers can be filled with optional Envirotemp FR3 fluid, which provides increased fire safety and superior environmental characteristics where less-flammable fluid is desired. Because the fluid is readily biodegradable and non-toxic, Envirotemp fluid provides sustainable performance at a low cost.