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Thread: AMP Fuse or Inline Fuse

  1. #1
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    AMP Fuse or Inline Fuse

    Hello,

    My 350w AMP has two 25A (blade) fuses built in.

    If I do my maths correctly:
    I = P / V hence 29.1 = 350w / 12v

    Then rounding up I should be using a fuse of 30A (maybe 35A is better)

    So here is my confusion:

    1) Why does my amp have 2 fuses totaling 50A when I get 30A
    2) Is the fuse on my AMP really 25A and the other one is spare?
    3) Do I really need another inline fuse from my battery to the amp

    I'm sure there is a simple answer to this.

    Thanks...

    P.S. AMP: Sony XM-540Z

  2. #2
    Variable Bitrate john05srt4's Avatar
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    ALWAYS use an inline close the the battery and near the amp. That fuse is to protect the AMP if it spikes, but if the cable was cut it could still short before the amp and cause a fire.
    And it probably splits te power among to power rails inside the amp thats why it has 2 fuses.
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  3. #3
    Constant Bitrate stangg172006's Avatar
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    so two in line fuses are required?

    Battery---Fuse-------------------------------------Fuse---Amp?
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  4. #4
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    Just one on the wire, placed at maximum 12" from the battery and the one or more that comes build in the amp. If you change the main wire gauge you should place another fuse on the new wire. Each fuse is rated according to the wire's gauge. The fuses in the amp are rated to the amp.

  5. #5
    Constant Bitrate stangg172006's Avatar
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    gothcya, thanks...
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  6. #6
    FLAC Jahntassa's Avatar
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    The reason you put the fuse within 12" of the battery is to protect the battery. Without that fuse, if something happens to the rest of the cable run, it could short and cause some serious damage.

    As far as why the OP's amp has two 25 amp fuses...who knows. But I wouldn't try to brain out the math on it. Just get a 60amp glass fuse up near the battery and you'll be good.

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