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Fuse size Question

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Discussion in 'Power Electronics' started by deanofire, Jan 2, 2021.

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  1. Jan 2, 2021 #1
    deanofire

    deanofire

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    Dec 20, 2020
    i am powering a new 5v camera from a 12v box power supply with a drop down buck convertor at the camera end,i have tried the camera on a shorter cable and it works fine during the day but once it gets to night and the IR sensors and its external light come on it blows the fuse in the power box,
    the individual fuse in the box is a 20mm glass 400ma fuse. is it possible (safe) for me to put a larger fuse in ,as the camera is rated at DC 5V2A Power Supply
    Power Consumption ≤ 6W
     

    Attached Files:

  2. Jan 2, 2021 #2
    (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,449
    2,809
    Jan 21, 2010
    Use a 1A fuse.

    At 6W the unit will draw more than 500 mA from the 12V supply due to inefficiencies in the step down converter.
     
    deanofire likes this.
  3. Jan 2, 2021 #3
    deanofire

    deanofire

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    Dec 20, 2020
    Thanks
    will give this a try, just wanted to make sure it was safe to put a larger fuse in the power box.
     
  4. Jan 2, 2021 #4
    deanofire

    deanofire

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    Dec 20, 2020
    Should i use a slow or fast blow fuse ?
     
  5. Jan 2, 2021 #5
    oiphy

    oiphy

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    2
    Dec 16, 2019
    does not matter slow or quick.
     
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  6. Jan 3, 2021 #6
    (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,449
    2,809
    Jan 21, 2010
    Use a fast blow. This application does not anticipate short, and normal exceedences of the rated current.
     
    deanofire likes this.
  7. Jan 3, 2021 #7
    bertus

    bertus Moderator

    1,336
    525
    Nov 8, 2019
    Hello,

    Have a look at the following PDF sections from littelfuse.

    Bertus
     

    Attached Files:

    oiphy and deanofire like this.
  8. Jan 3, 2021 #8
    deanofire

    deanofire

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    Dec 20, 2020
    Thanks
     
  9. Jan 3, 2021 #9
    deanofire

    deanofire

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    Dec 20, 2020
    Thanks
     
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