Wideband Harmonic Filter

“Eliminate Harmonics and improve power quality”

Amtech Electronics wideband harmonic filter

With the growing electrification, the issue of efficient use of electricity became important. Initially the focus was mainly on reducing the reactive power to improve the Power Factor. Then came the VFD for energy saving and better control performance but at the cost of higher harmonics. Today, the significance of harmonics in modern distribution grids has increased vastly.

Harmonics produced by power electronics equipment having nonlinear loads adversely affects system infrastructure and loads. WHF from Amtech limits current harmonic distortion to the acceptable limit over a wide load range. Variable Frequency Drive (VFD) draws non-linear current from the mains and produces harmonics distortion. IEEE 519-2014 standard requires various levels of harmonic mitigation. The WHF reduces current THD to less than 5% and helps to meet the standard’s requirements.

Most traditional filters work fine at 100% power load, but severely underperform at light loads. In practical world, almost no equipment runs at full load all the time. The WHF offers industry leading performance from light loads to the rated load. It is stand-alone input equipment with its own enclosure, installed adjacent to the VFD. It is designed to reduce harmonics caused by VFDs. One higher rating WHF can also be installed at the input of multiple VFD as an cost effective alternate.

  • Range : 11…355 kW, contact Amtech for high power ratings
  • Voltage : 380...440 VAC, 3-Phase, 50 Hz


  • Limits current harmonic distortion to less than 5% over a wide load range
  • IEEE 519-2014 compliant
  • Cost effective, maintenance-free filter design - no adjustments needed
  • Forced cooled enclosure
  • Excellent behavior under partial load conditions
  • Extends the life of VFD and other equipments like transformers and motors
  • Highest efficiency from partial load to full load
  • Easy installation and commissioning


  • Prevents possible harmonic resonance.
  • Optimum utilization of power capacity.
  • More immunity to input voltage distortion.
  • User- friendly operation.
  • Facilitates networking ability.
  • Selective harmonics elimination by digital programming.
  • Minimum insertion loss resulting in efficient operation.


  • VFD with 6-pulse converter
  • DC Drives
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