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)
    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
  • Multi-tap Power Transformer, 280VA
    This compact transformer is rated 120/240V, 50/60Hz input, with outputs for 4V, 8V, 12V, 18V, 22V and 26V. 29M6 Electrical Grade Steel core with Class B (130C) insulation system. (Model 214059)
  • Power Step-Down Transformer Assembly with Wiring Harness and Integral Output Protection
    Value-added custom step-down transformer assembly for laboratory equipment. Transformer incorporates a multi-tapped input (100/120/200/220/230/240V) for international supply applications and dual SELV outputs, 22VA @ 50/60Hz. Includes wiring harness and output fuse protection circuitry mounted together with the transformer on a conversion coated aluminum bracket. RoHS compliant. Custom Model 206053.
  • High Voltage Transformer, 6000V @ 20kVA, 4-7kHz with Epoxy Encapsulated Windings for Corona Resistance
    This custom specialty transformer was designed for use in a system for ozone generation for water sanitizing. This transformer utilizes epoxy-encapsulated windings to provide additional protection against damage caused by partial discharge (corona). Encapsulation is performed under vacuum with the goal of replacing air with epoxy to provide a superior medium of insulation. Rated 600V input, 6kV output @ 4-7kHz. Insulation is Class F (180C). Copper foil and Litz wire windings on a gapped ferrite core. Model 211020.
  • 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 ret...
  • 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.
  • High Current Output Multi-Tap Step-Down Power Transformer
    This Multi-Tap Step-Down Power Transformer is 240V, 60Hz fundamental input with a total of 9 incremental taps yielding 2.0-4.0Vac @ 5kVA (1250-2500A). Low loss 29M6 Electrical Grade Steel core with 8AWG heavy copper windings (MW-36C) Class H (180C) insulation. 90lbs.
  • Constant Voltage Ferroresonant Power Transformer Assembly
    120V, multiple output, 550W total, 29M6EI laminations, Class H 180C insulation, assembled with rectifier & control circuitry. Used in safety-critical Airport Lighting applications.
  • Submersible Transformer
    Water Tight Submersible Transformer. 277:120V, 60Hz, 750VA, 25lbs Fully encapsulated within custom aluminum housing, SOW leads (100lb pull test)
  • Airfield Lighting SCR Type Stacked Xfmr Assembly
    25KVA + 25KVA For use in Phase Controlled AC SCR Type Transformers, Input Impedance = 3.5 -5.0%
  • Ferroresonant Airport Beacon Power Transformer
    2000V@ 250VA, 50Hz Provided with integral rectifier and control circuitry

We Do Power Perfectly

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

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Production runs from five pieces to 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
  • Designed to meet CSA & UL (safety) or MIL PRF 27 (aerospace / military) requirements upon request
  • MIL PRF 27 Grade 5 & 6 encapsulation available