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Isolating Line Filter

Isolating Line Filter


The Always On TTF/ILF (Toroidal Isolating Line Filter) combines a low-pass series filter with a toroidal isolation transformer. It provides for total protection against all power aberrations and eliminates any troublesome constant voltages which may exist between neutral and ground in some electrical configurations. It is totally compatible with all operating loads including high frequency switching power supplies.

The TTF/ILF corrects ground fault problems and eliminates neutral voltages by re-establishing the "zero" volt ground reference point. It provides excellent noise protection, eliminating problems cause by normal mode and common mode noise, as well as other electrical aberrations such as: transients, spikes, surges, harmonics and lightning-induced voltages.


  • Computers
  • Laser printers
  • Copiers
  • Point-Of-Sale terminals
  • Medical instruments
  • PLC's
  • Process instruments
  • Robotics

Protects from:

  • Reverse polarity
  • Spikes
  • Surges
  • Transients
  • RFI/EMI interference
  • Common/Normal mode noise
  • Direct/Indirect lightning effects
  • Voltage between neutral and ground

For more information, contact us or see the TTF/ILF page from our catalogue (8MB download).