Do some ATX powersupplies have an inbuilt circuit breaker?

Discussion in 'Computer Support' started by Gaius Baltar, Dec 9, 2006.

  1. Gaius Baltar

    Gaius Baltar Guest

    Thinking of cheaper units, around $AUD20-$30

    gb
     
    Gaius Baltar, Dec 9, 2006
    #1
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  2. Gaius Baltar

    Pennywise Guest

    In a way all of them do, they all have a 5A fuse. Some are even easy
    to replace, most tho are soldered in.
     
    Pennywise, Dec 9, 2006
    #2
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  3. Gaius Baltar

    824 Guest

    Years ago I built a cheap as I could PC and the power supply was the
    cheapest around.($12.99) I was screwing around and shorted it - lo and
    behold it had a circuit breaker in the circuit. Last month I built a new PC
    and included a $89.00 power supply that didn't have one. Screwed up again,
    had to disassemble it and resolder a fuse in. Times have changed.
     
    824, Dec 9, 2006
    #3

  4. You werre lucky. After all, Murphy's Law of Fuses states that if a device
    is protected by a fuse, the device will protect the fuse by blowing first.
     
    Gary G. Taylor, Dec 9, 2006
    #4
  5. Gaius Baltar

    J-McC Guest

    I have found more often than not the fuse sacrifices itself after the
    main power semiconductors have shit themselves. When repairing it it
    is a good idea to put a 100w 240v or 110v bulb in series with the
    mains to limit the current if you miss a faulty component, the bulb
    will glow if there is still a fault with the power supply if the power
    supply is run under a small load. This has saved me some new
    switching transistors or mosfet devices.
    I have never seen a circuit breaker in a power supply (from memory)
    but plenty of soldered in fuses. I guess a fuselink is so much
    cheaper.
    Jim McCardle
    --------------------------------------------------------------------------------------------
     
    J-McC, Dec 9, 2006
    #5
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