Custom Transformers Designed The Way You Need Them

Custom made transforms are uniquely designed to relevant dimensions, physical constraints, and terminations. Therefore, they offer more effective solutions than a standard transformer that may not fit well. Being an industry-leading custom transformer manufacturer, Custom Coils has been providing high-quality custom transformers and inductors for various challenging client applications, since 1967. Our expertise across a vast range of industries coupled with a well-equipped facility featuring various advanced custom transformer winding equipment enables us quality and fastest turnaround times in the industry. The specialty transformers and inductors provided by us can easily overcome concerns such as complex input and output requirements, multiple operating frequencies, differing impedance levels, and more.

Power Transformers


At Custom Coils, our team of engineers work closely with clients to understand their various mechanical and electrical requirements. A custom transformer design begin with a comprehensive analysis of the client needs and ends with the best possible configurations of core materials, conductors, and specifics.

Custom Transformer and Inductor Solutions We Provide

Being a leading custom transformer and inductor manufacturer, we specialize in the design and manufacturing of the following transformers and inductors:

Custom Transformer Design Features and Specifications

Custom Coils is well-recognized for its reliable, high-quality custom made transformers. Our experts customize or modify any of the transformers in the following specifications:


  • Output Voltage: Up to 60KV
  • Output Power: Up to 2000VA
  • PC Mountable: through-hole or Surface mount
  • Low profile
  • Split Section
  • Encapsulated
  • Flying Leads
  • Custom Choke Designs
  • Bobbin or Coil form


  • Air Coil or Self Support
  • Large or small inductance values (Milliamperes to 10,000 Amps)
  • High current
  • PC Mountable through-hole or surface mount
  • Axial lead or drum core

Overall Capabilities

  • Power Types: Single Phase, Two Phase, Three Phase, and Multi Phase
  • Operating Temperatures: -55 °C to +220 °C
  • Voltage Classes: 600 V, 5kV, 15 kV, and 34.5 kV
  • Insulation Thermal Rating: Up to 150°C
  • Production Volumes: Prototypes, High Volume, and Low Volume
  • Testing and Inspection: At Custom Coils, we conduct 100% testing of our inductors and transformers on the basis of the following parameters:
    • Current
    • Voltage
    • Vars
    • Watts
    • Power Factor
    • VA
    • Efficiency

Design Elements

At Custom Coils, we carefully consider the client requirements while designing and manufacturing custom transformers for their applications. It doesn’t matter, whether you are looking for size, cost, packaging, or electrical performance of your equipment, we can easily fulfill all these requirements.

  • Conductor Materials: Aluminum, copper, foil, and America-made magnet wire
  • Core Materials: Powdered iron alloys, ferrite, mpp, high flux, amorphous, laminated and tape wound
  • Conductor Geometries: Litz wire, round magnet wire, foil, rectangular magnet wire, planar, square magnet wire, stamped windings, and more.
  • Enclosure Types and Options: Non-ventilated, stainless steel, totally sealed, indoor, outdoor, rain shields, and more.
  • Construction: Encapsulated, standard dry type, and cast coil
  • Terminations: SMD, through-hole, flying lead, press fit
  • Vacuum varnish and potted impregnated
  • Soldering, assembly, automated winding
  • Special epoxies, magnetic wires, insulation materials and tapes are used in transformers that have typical flammability and temperature requirements


Our custom made transformers provide the reliability, quality, and efficiency that most industrial applications require. Whether your application demands a space-saving transformer or a reliable solution for a power generation application, we offer performance-driven custom transformer designs that would fulfil your needs.

Industries Served

Over the years, we have established a long list of happy and repeat customers in the following industries with our innovative custom transformer/inductor designs.

Would you like to know more about the possibilities of customizing your transformer designs? You can contact us today to discuss the requirements with our experts. With a vast industry experience to their credit, our experts will guide you in every phase of custom transformer design right from the conceptualization to the final phase of delivery. You can also request a quote, as well as get answers for all your queries at the same time.

Have a question about a custom transformer or any other custom magnetic assembly?

Ask our skilled experts can solve all your queries!

Contact Us At 605.934.2460


Custom Coils
PO Box 348
109 Iowa Street
Alcester, SD 57001-0348

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