These type QL transformers have passed the UL K-factor testing program. K-factor is a unit measuring a transformer’s ability to withstand the harmonics content of a system. Midwest offers K=4, K=13, K=20 and K=30 transformers.

Features and Benefits

  • K-Factor rated for nonlinear loads
  • UL listed
  • Complies with DOE-2016 efficiency standard
  • Full-width aluminum electrostatic shield standard
  • 200% neutral standard
  • Effective coupling capacitance 30pF
  • Common mode noise attenuation 120dB
  • Normal mode noise attenuation 30dB
  • Available in 150C, 115C, 80C and low-noise models
  • NEMA 2 powder-coat drip-proof enclosure is standard. Weathershield kit is available for conversion to NEMA 3R outdoor



  • Welders
  • Induction heating
  • HID lighting
  • Fluorescent lighting



  • Telecommunications equipment
  • Classroom facilities
  • Healthcare facilities
  • Production lines
  • SCR variable speed drives



  • Office buildings
  • Data processing equipment
  • Adjustable speed drives
  • Computer installations
  • Instrumentation



  • Computer installations
  • Office buildings
  • Data processing equipment
  • Adjustable speed drives
  • Instrumentation


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