These units are designed to remove "noise" off the mains and keep it squeaky clean, there are separate 
   output filters which keep "cross feedback noise" filtered out at that separate section.
  
    Naturally, we have incorporated the best possible multiple "M.O.V." ( Metal Oxide Varistor ) protection 
    on the inputs to reduce your exposure to surges and spikes. 
   
    These M.O.V.'s must be replaced every three years "without fail" or sooner to continue with the level 
    of reliable protection and clamping of surges and spikes on your mains.