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Any Ideas to prevent Failures of Solid State relays

Discussion in 'Electronic Basics' started by karthik, Jan 10, 2006.

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  1. karthik

    karthik Guest

    I am using Solid state relays to On/Off heaters so as to control
    temperature.
    In case if heaters get short,immediately the Solid state relays ( SSR )
    also gets short and
    I need to change new one.Even though I have Fuse protection the SSR and
    Fuse gets blown.
    Since the Cost of SSR is high,I have so many troubles.

    So any one Please suggest some ideas to prevent SSR failure.Is there
    any protection like
    Varistors , RC circuit to prevent this?????
     
  2. Pooh Bear

    Pooh Bear Guest

    Why have you posted this 5 times ?
     
  3. John - kd5yi

    John - kd5yi Guest


    Use a fuse whose I-squared-T rating is less than the SSR's semiconductor
    device I-squared-T rating. Also use what is known as a sub-cycle fuse. If
    you size the fuse this way and it's continuous rating turns out to be less
    than the heater's normal current, your SSR is too small.

    John
     
  4. Guest

    If your heaters keep shorting you need another make. You need the right
    type of fuse ie thyristor semiconductor fuses these are also expensive.
     
  5. Alan B

    Alan B Guest

    You must be mistaken. I only see it posted four times. :)
     
  6. Guest

    How big a heater? 1500 watts? What kind of heatsink is the SSR mounted
    on? Why are your heaters 'get(ting) short'? Others have pointed out
    that THAT should be addressed -- like now. What is the rating of the
    SSR? Is there a largish motor as part of the heater that could have a
    large inrush?

    In general, SSRs are fairly tough to blow up so what are you actually
    doing to it?

    GG
     
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