Fuse Ratings??

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  • SafeAirOne
    Overdrive
    • Apr 2008
    • 3435

    Fuse Ratings??

    This is something that I've known about but ignored for some time now:

    The few circuits in my SIII that Solihull saw fit to protect with fuses are all "protected" with 35 AMP FUSES!

    A wire had come out of its connector and shorted last week. I was surprised to find one of the fuses had actually blown before the rover burst into flames.

    Anyone happen to know whether the SIII originally came with ALL 35a fuses or whether a PO just wanted to avoid the hassle of changing blown "reasonable-amperage" fuses?
    --Mark

    1973 SIII 109 RHD 2.5NA Diesel

    0-54mph in just under 11.5 minutes
    (9.7 minutes now that she's a 3-door).
  • Jim-ME
    Overdrive
    • Oct 2006
    • 1379

    #2
    Mark,
    I think that those are correct.
    Jim

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    • TeriAnn
      Overdrive
      • Nov 2006
      • 1087

      #3
      Originally posted by SafeAirOne
      This is something that I've known about but ignored for some time now:

      The few circuits in my SIII that Solihull saw fit to protect with fuses are all "protected" with 35 AMP FUSES!
      British fuse ratings are different than US fuse ratings.

      The British Standard rates fuses by the current that was guaranteed to make them blow instantly while the American standard rates fuses by the current that they will carry forever. Fuses work on heat, so a small overload may take a long time to build up enough heat to melt the fusible element and blow the fuse. How warm the fuse was to begin with plays a large role too. So the carry rating winds up being quite a bit lower than the blow rating. an English 35 amp fuse is roughly the same as a US spec AGC 25 fuse. An AGC20 fuse might be a tad safer and work OK.

      I think all the LR parts houses carry proper British spec fuses (Though they look the same, the size is slightly different).

      Hmmm, maybe I should write yet another web page.
      -

      Teriann Wakeman_________
      Flagstaff, AZ.




      1960 Land Rover Dormobile, owned since 1978

      My Land Rover web site

      Comment

      • SafeAirOne
        Overdrive
        • Apr 2008
        • 3435

        #4
        Thanks Jim and TeriAnn.

        That makes sense TeriAnn...While I was checking the fuses the other day, I was wondering how a 35 amp fuse could have such a miniscule wire element.
        --Mark

        1973 SIII 109 RHD 2.5NA Diesel

        0-54mph in just under 11.5 minutes
        (9.7 minutes now that she's a 3-door).

        Comment

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