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Optimal Solutions To Demanding Requirements


Unique current transformer designs for applications including instrument control & monitoring, switch mode power supply control and feedback for equipment protection. Materials are chosen to optimize performance and reduce cost.


Example Types of Current Sense Transformers:


  • Wye-Delta3
  • Encapsulated
  • High-Frequency Sense
  • Torodial



Recent Work

Current Source Transformer


Current Source Transformer

High Power 250:1 Turns Ratio Open Style, 4 Slot Chassis Mount, 1600A Output



Current Transformer (CT)


Current Transformer (CT)

1000:1 Turns Ratio Tape Wound Toroid, 220A Primary Current



Large Coil-Only Current Transformer (EC Custom Model 217076)


Large Coil-Only Current Transformer (EC Custom Model 217076)

Used to measure current for utility applications, this large coil consists of 3-ph windings of 0.060x0.160 & 0.075x0.280 rectangular MW18C wire wound on a custom paper coil form. Class H insulation. Hytex layer insulation and Mylar outerwrap.


Transformers That Perform.

State-of-the-art materials, expert design capabilty and world-class manufacturing


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Current Sense Transformer Capabilities at Electronic Craftsmen

  • Burden load – may be provided by us or customer supplied

  • Accuracy as low as 0.1%

  • Linearity

  • 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