surge protector boards at harvey norman

Discussion in 'Electronics & Electrics' started by Manou12, Feb 11, 2013.

  1. Manou12

    Manou12 Member

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    Hey all quick question are the special power boards you can get at Harvey Norman worth the $$? Got my lappy couple of days back and was told that If I get one of their power guard boards that apparently filter power and under voltage and over voltage protection which surprisingly works bit is it worth the $140 I was gonna have to pay? Sorry if I posted in the wrong section
     
  2. dakiller

    dakiller (Oscillating & Impeding)

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    In my opinion, no.

    The actual parts that do the real protection, called MOV's, cost only a few dollars total in these power boards
     
  3. OP
    OP
    Manou12

    Manou12 Member

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    Thanks mate
     
  4. maddhatter

    maddhatter Member

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    Seconded, the boards are a gimmick and a waste of money.

    MOV's are a type of resistor (cheap) which, when the voltage across the MOV is increased above it's threshold the MOV resistance decreases significantly instantaneously, allowing the excess voltage to dump to earth / neutral. It's certainly nothing fancy and any $20 power board with surge protection will suffice.
     
  5. 2xCPU

    2xCPU Member

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    I'm another non-believer in the overpriced boards, but that aside, no power board protects from undervoltage.

    2.
     
  6. Draffa

    Draffa Member

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    Additionally, I tell people to replace them every year or so anyway.
     
  7. 2xCPU

    2xCPU Member

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    There are probably places where that is appropriate, but unless your sitting next to some industrial gear, ten years is probably more reasonable.
    (unless of course your getting a kickback)

    2.
     
  8. fad

    fad Member

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    Do you test and tag every year?
     
  9. TERRA Operative

    TERRA Operative Member

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    The more expensive ones will have much larger MOV's that are able to absorb much higher spikes before failing, as well as high speed transorbs that catch the fast spikes that an MOV cannot react quickly enough for.
    Both these cost in the range of dollars each, so there could be around $20 or so of suppression in a good board.

    Is it worth the HN pricetag? Nope. Go to Umart or the like and spend the cash on a UPS instead.
    A standard surge diverter will not protect against unvervoltage.
     
  10. 2xCPU

    2xCPU Member

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    HaHa - I just noticed the paradox between this statement and your sig.
    Perhaps replacing the MOVs, Transorbs, Gas tubes etc. occasionally might be more inline with your own philosophy.

    2.
     
  11. OP
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    Manou12

    Manou12 Member

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    They had a powerful light attached to a voltage changing thingy and when they bumped up the voltage past 240 it cut off and when it was unplugged it got unbelievable brighter and once ot went below 220 the thing light cut off hence why I got curious and hence the post here lol
     
  12. 3stars

    3stars Member

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    they fail the insulation resistance test anyway.

    it's standard for some locations even 3 monthly
     
    Last edited: Feb 12, 2013
  13. maddhatter

    maddhatter Member

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    'tis by design, don't hold that against them :)
     
  14. 3stars

    3stars Member

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    test and tags a crock anyway :)
     
  15. Draffa

    Draffa Member

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    Tha rationale for me saying to replace them every year is because I'm expected to diagnose any proplems with anything with a current running through it, and telling people to replace them yearly means they might actually get around to replacing them every three or four. There's one board I'm aware of that hasn't been replaced in five years even though it's obviously faulty.

    Should, but no.

    They go under option 4: recycle. If I could solder worth a damn, then they'd be tested and repaired. :)
     
    Last edited: Feb 12, 2013
  16. Gecko

    Gecko Member

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    Don't have a copy of AS3760 in front of me to quote the relevant section, but testing is to be completed at 250V when voltage limiting devices are fitted (ie surge protection). If the test is done right (and the unit isn't faulty), it will pass :)

    2-4 years is probably more realistic depending on the environment. The MOVs are going to degrade over time, so it will keep on passing power, but the surge protection will be useless.
     

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