Envirotran Single-Phase Overhead Transformers


Envirotran transformers offer an environmentally responsible, high efficiency, safer choice. The units have high-fire-point fluid, providing fire safety benefits, and a projected life well beyond that of a traditional mineral-oil transformer. These efficient and cost-effective transformers use Envirotemp FR3 fluid. Envirotran transformers are manufactured in 5-167 kVA, in primary voltage classes of 15 kV, 25 kV and 35 kV. It is available in single- or double-bushing covermount configuration, with secondary voltages of 120/240, 240/480 or 277.

kVA 5-167
Primary Voltage up to 19,920 V
Secondary Voltage 120-600 V


  • Fluid conforms to ASTM D6871-03 and to pending IEEE® PC57.147, “Guide for Acceptance and Maintenance of Natural Ester Fluids in Transformers”.
  • Interlaced core-type design, more resistant to low-side voltage surges
  • Tank coating exceeds ANSI® C57.12.31
  • Tin-plated high- and low-voltage bushing terminals to accommodate aluminum or copper conductors.
  • Laser-engraved nameplate
  • Cover-mount, wet process porcelain high-voltage bushings resistant to high-voltage corona
  • Tank grounding provisions
  • Heavy-duty lifting lugs and hanger brackets per ANSI® requirements
  • Visible cover ground on units with cover-mounted bushings
  • Single-bushing Envirotran transformer, shown with optional arrester and hand wheel bird guard.
  • Recessed tank bottom that offers protection when sliding over rough surfaces
  • Automatic pressure-relief device
  • Thermoset polyester low voltage bushings. More temperature resistant than standard polymer
  • Arrester mounting and grounding provisions
  • Internal mark indicates the proper fluid level
  • Secondary leads stamped to ensure proper identification
  • Corrosion-resistant cover band
  • Quality System ISO-9001 certified
  • Decal, “Filled with Envirotemp™ FR3™ fluid, ultimate biodegradability” teardrop shape

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