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Transforming Power Since 1956


A superior quality assurance program and an express delivery produces top-rated power transformer products with exceptional PPM (parts per million) performance. We work with you to build a component that perfectly fits your need. We assemble each unit in house with care and precision, that's why we confidently back all of our units with a 5 year warranty.


Example Types of Power Transformers:


  • Autotransformers
  • Rectifier
  • Audio
  • Isolation
  • Constant Voltage
  • Ferro-Resonant
  • Constant Current
  • Battery Charging
  • Foil-wound




Recent Work

High Voltage Transformer 7500–9400Vac output (EC Custom Model 220034)


High Voltage Transformer 7500–9400Vac output (EC Custom Model 220034)

This open type transformer is used to generate a high voltage output in an air purification system.

  • Input Voltage: 240–300V
  • Output Voltage: 7500–9400V
  • Frequency: 25–30kHz
  • Power: 1500VA
  • Ambient Temperature: up to 45°C
  • Fits in a 130mm cylinder
  • Includes thermal cutout protection



Zig-Zag "Zero Sequence" Grounding Transformer Assembly, 600V, 20A/phase


Zig-Zag "Zero Sequence" Grounding Transformer Assembly, 600V, 20A/phase

Grounding (or Zig-Zag) Custom Transformer Model 215033 shown with cover removed on NEMA 1 enclosure. Also included is a 393 mohm 60A "neutral" inductor (smaller magnetic shown). The application is for the creation of a missing neutral connection from an ungrounded 3-phase Delta system to permit the grounding of that neutral to an earth reference point; also to reduce harmonic content. During a phase to ground fault the zig-zag transformer’s coils magnetic flux are no longer equal in the faulted line. This allows zero sequence current to now flow from the point of the fault to ground and return to the zig-zag transformer’s neutral.



34kVA Airport Lighting Transformer - Constant Current Regulator Application


34kVA Airport Lighting Transformer - Constant Current Regulator Application

This example custom power transformer is rated 34kVA @ 50Hz, 400Vin, 1620Vout. Input Impedance 5% Minimum, 20% & 60% Output Taps. Constructed of MW35&36C Rectangular Copper wire coils with dog-bone ventilation assembled onto a 26M19 Electrical Grade Steel core with Class H (180C) insulation. Used in a constant current regulator for airfield lighting power and control solutions.


We Do Power Perfectly.

Years of expertise guarantee a smooth process from design to completed parts.



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Production runs can vary from 1 - 100,000 pieces.  We design and manufacture power
transformers for virtually any application. In addition to optimizing electrical performance, our designs
incorporate critical end-use factors including:

  • Physical dimension
  • Thermal requirements
  • Temperature extremes
  • Performance at altitude
  • Operation under shock and vibration


Power Transformer Capabilities at Electronic Craftsmen 

  • Power: From mW to 50kVA @ 60Hz or up to 200kVA @ 20kHz (typical)
  • Working Voltage up to 12kV (depending on frequency); multiple stages possible for higher outputs
  • Frequency: 25Hz to 500kHz (typical)
  • Temperature Class to 220C (155C / Class F typical)
  • Weight: 0.06 oz / 1g to 550 lbs / 250kg
  • Multiple taps as required
  • Dielectric Strength (hipot) to 30kVac or 20kVdc
  • Parts can be vacuum varnished or molded with a variety of hard or soft encapsulant materials with thermal conductivity.
  • Wire sizes from 1-45 AWG or Copper Foil to 0.050in thick (in multiple layers for higher current); Litz wire for higher frequency
  • Regulation to specification
  • Manufactured using all known state-of-the-art magnetic core materials, including but not limited to electrical grade steel laminations, ferrites & powdered iron, nickel-iron alloy, iron amorphous metal strip-wound cores, nanocrystalline cores and small toroids.

  • Antifungal and non-nutrient coatings available

  • Corrosion resistant coatings & platings available

  • Standard or custom terminations & leads

  • Mounting Configurations: pcb-mount (horizontal or vertical), custom or standard brackets or stacked configurations

  • Designed to meet CSA & UL (safety) or MIL PRF 27 (aerospace / military) requirements upon request

  • MIL PRF 27 Grade 5 & 6 encapsulation available