epoxycast Transformers

At AFP Transformers, our Epoxycast transformers provide several benefits to traditional dry type transformers. Epoxycast transformers can withstand high power surges as a result of higher BIL ratings. The coils are directly cast into the mold under pressure, instead of using vacuum pressure impregnation to apply resin to the coils.  The coil is deeply embedded in the epoxy material,  protecting coils from contaminates and holding the windings in place during power surges. The secondary coils are standard dry type processed with a polyester resin in VPI process. 

Epoxy material is strong and requires little maintenance. As a dry type transformer, there are no hazardous liquids or materials to pose a safety risk. Since they do not contain hazardous materials, Epoxycast transformers do not require transformer vaults that limit placement options and significantly add to the cost of liquid transformers.

AFP Transformers manufactures a wide range of transformers from 600V to 34.5 kV voltage classes. Epoxycast transformes are used in a variety of application including control power transformers, pad-mount distribution transformers, and neutral grounding transformers used in utility and cubicle applications. For additional information about this product see the table below, or Contact Us directly.

EpoxyCast Transformer Capabilities

Transformer Type
Control Power Transformers
Neutral Grounding Transformers
Distribution Transformers
Power Transformers
Superior Short Circuit Resistance
Low/No Maintenance Required
Leak Proof
No Hazardous Materials
Power Type
Single Phase
Three Phase
Voltage Class
600 V
5 kV
15 kV
34.5 kV
Cast Coil (Epoxycast®)
Winding Material
Copper Wire Standard
Additional Configurations on Request
BIL Rating
60kV to 170kV
Dependent on Transformer Voltage Rating
Testing & Inspection
100% Product Testing
IEEE C57.12.91 Special, Standard, or Custom
Testing Parameters Stored
  • Voltage
  • Current
  • Watts
  • Vars
  • VA
  • Power Factor
  • Efficiency
Applied Potential (HiPot) Testing to 100 kV AC RMS
BIL capability up to 300 kV
Partial Discharge Testing
  • Up to 100 kV applied potential
  • In excess of 70 kV induced potential
Customer Specified Testing as Requested
Stocking Programs
JIT Shipping
Production Volume
Low Volume
High Volume
Lead Time
3 to 6 Weeks Typical
Expedited Turnaround in as little as 1 Week

Additional Information

Industry Focus & Applications
Switchgear Manufacturers
Motor Control Center Manufacturers
Power Factor Correcting Equipment Manufacturers
Power Conditioning Equipment Manufacturers
  • PDU manufacturers
  • UPS manufacturers
  • Voltage Regulator Manufacturers
  • Data Center CPUs
Industrial Heating Equipment Manufacturers
  • Furnaces
  • Induction Heating Power Supplies
  • RF and Microwave Heating Machines
Mining Machine Manufacturers
Waste Water Treatment
OEM Machine Manufacturers
  • Machine Toolmakers
  • Packaging Machines
  • Semiconductor Machine Manufacturers
  • Web Processing Machine Manufacturers
Industry Standards
IEEE C57.12.01
General Requirements for Dry-Type Distribution & Power Transformers, Including Solid Cast
IEEE C57.12.91
Standard Test Code for Dry-Type Distribution & Power Transformers
UL 508
UL Standard for Industrial Control Equipment
UL 506
UL Standard for Specialty Transformers
UL 1561
Industry Standard for Dry Type General Purpose & Power Transformers, 600 Volt Class
UL 1562
Industry Standard for Dry Type General Purpose & Power Transformers, Medium Voltage, Up to 34.5 KV
Standard for Dry Type Transformers for General Applications
Test Code for Transformers, Regulators & Reactors
Industrial Standard for Controllers, Contactors, Overload Relays & Related Equipment. (Motor Starting Autotransformers & Reactors)
International Standards
IEC 60076
Power Transformer & Reactors - Medium Voltage
IEC 61558
Power Transformers & Reactors - 600 Volt Class
CE Certification to IEC Standards
Marine Standards
American Bureau of Ships
Det Norske Veritas