Dual voltage surge protection

Discussion in 'General Electronics Chat' started by Fuzzy54, Mar 24, 2011.

  1. Fuzzy54

    Thread Starter Member

    Jun 9, 2006
    11
    0
    I have a device that is required to be capable of being powered off the U.S. 110V or the Euro 230V, what is the best way to provide surge protection for such a device, I will be running about 13amps.
     
  2. saikat36

    Member

    Jan 28, 2009
    16
    0
    Use MOV (Metal Oxide Varistor). This device looks like disc capacitor & non-polar. Use 1pc of each btw L-N, N-G, L-G above atleast 300V ratings.
     
  3. ifixit

    Distinguished Member

    Nov 20, 2008
    638
    108
    hi Fuzzy54,

    Does that device automatically adapt to the change in line voltage, or do you have to toggle a switch to change voltage ranges?

    If it is automatic then you don't need to protect the lower (US) range, just protect the higher 230V range. Allow for 10% high line voltage and calculate the peak value. 230 x 1.10 x 1.414 = 357 Vac. Select a MOV for a voltage just above this. Better still, use a part that is made just for this application.

    If the device is switch selectable, then each circuit will require a different MOV voltage rating.

    Calculating the energy rating is a little more challenging. Basicly, the MOV needs to be big enough to blow a fuse, or trip a breaker if the surge has enough energy. How is the equipment fused?

    Regards,
    Ifixit
     
Loading...