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What fuse would a need?

Discussion in 'General Electronics Discussion' started by SkyKonig, Jul 16, 2016.

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  1. SkyKonig

    SkyKonig

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    Jan 26, 2016
    I plan to add some LEDs to my car. On them it says input voltage = DC12v, and output current = 6A max. I plan to run these with a piggyback (expandable circuit) from my fuse board, so will a use a standard car fuse but not sure which one to get. The LEDs originally had a cigarette lighter plug attached to them, but i plan to un-solder this and re-solder it directly to the piggyback cable. In the original plug it had a F1AL250v fuse but i couldn't find the equivalent of this as a car fuse and not even sure if it would be the same. Thank you :)
     
  2. Tha fios agaibh

    Tha fios agaibh

    2,155
    725
    Aug 11, 2014
    You can use a 1amp automotive fuse such as an atc1 or just use the fuse you have and put it in an inline fuse holder close to it's source.
    You don't need the 250v rating in a car.
    Most automotive fuses are rated for 36v which is fine.
    The important thing is; don't use a fuse larger than the wire can handle.
    At 1 amp I'd say your fine.
    It may be better to use the original fuse inline since its fast acting type
     
    Last edited: Jul 16, 2016
  3. SkyKonig

    SkyKonig

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    0
    Jan 26, 2016
    This is perfect! Thank you so much :) Then could I use a 4a fuse in the fuse board?
     
  4. 73's de Edd

    73's de Edd

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    1,302
    Aug 21, 2015
    Then . . . . . if you REALLY need to know the precise answer.
    Use your DVM in its DC Current function and place it in the 10 amp range and insert it in place of the fuse and read out the ACTUAL current consumption.



    73's de Edd
     
    Last edited by a moderator: Jul 17, 2016
  5. Tha fios agaibh

    Tha fios agaibh

    2,155
    725
    Aug 11, 2014
    If the leds originally came with 1amp protection, that'd be good enough for me.

    Yes, you can feed the inline fuse from a 4amp circuit provided wire is large enough.
    (I would not use wire smaller than 22awg)
    It is wise to use shrink tubing to insulate any splices.
    And solder or crimp all connections.
    Electrical tape has a habit or unraveling or sliding off when it gets hot on small wires.

    You can size fuse as 73's de Edd suggested, but it'd have to be sized slightly larger, or you'll be blowing fuses all the time.
     
  6. Sunnysky

    Sunnysky

    483
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    Jul 15, 2016
    If LED spec is 6A max (14.5V) then use a slightly bigger fuse.
    Thats a lot of LEDs!

    cigarette lighters are usually 15A fuses
     
  7. 73's de Edd

    73's de Edd

    3,085
    1,302
    Aug 21, 2015
    Aside:

    Tha fios agaibh . . . .

    Gomer sez HEY ! . . . . . . .now if we can just find Le Martine.
     
    Tha fios agaibh likes this.
  8. Tha fios agaibh

    Tha fios agaibh

    2,155
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    Aug 11, 2014
    I was thinking the 6A rating was for the cigarette lighter plug, but was actually fused with the F1al250v inside it.
     
  9. Sunnysky

    Sunnysky

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    Jul 15, 2016
    I now agree
     
    Last edited: Jul 20, 2016
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