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12-volt and 220-volt fuse equivalents

verbatim57 Posted messages 11 Registration date   Status Member Last intervention   -  
verbatim57 Posted messages 11 Registration date   Status Member Last intervention   -
Hello,
Apart from some basic notions I don’t know much about electricity. I also need the opinion of specialists.
My problem today: I have a cigarette lighter power strip (12 V) protected by a 10 A fuse (small glass cylinder with two metal ends, with no markings). That fuse has blown. Can I replace it with a fuse marked: "F 500 MA 250 V"?
For me 1/2 ampere at 250 Volts = 125 watts and 10 ampere at 12 volts = 120 watts. But is it really as simple as that? What does the F mean? I have other fuses marked T. What does the T mean?
Thank you for your reply.
Sincerely.
M.C.

2 answers

  1.
    blux Posted messages 2067 Registration date   Status Moderator Last intervention   3 456
     
    Hi,

    in principle, current rating is independent of voltage; if a fuse blows at 10 A, it does its job regardless of the voltage...

    The F or T defines the tripping speed of the fuse: a fuse rated F will take about 1 to 10 ms to cut the current, a fuse rated T will take about 10 to 100 ms to cut the current. It is the equivalent of circuit breaker curves (B, C, M, Z...)

    It should also be noted that it only blows when it reaches 10 times its breaking value (100 A for a 10 A fuse), so 5 A for a 500 mA...

    You can replace your fuse with something like this:

    https://www.castorama.fr/3-fusibles-verre-zenitech-5x20mm-10a/3545411592234_CAFR.prd

    Note that no voltage rating is given...

    --
    A+ blux 
     "Les cons, ça ose tout. C'est même à ça qu'on les reconnait"
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    1. Anonymous user
       
      I still don't see the connection with a computer support site...
      0
    2. blux Posted messages 2067 Registration date   Status Moderator Last intervention   3 456
       
      We can plug a laptop into a cigarette lighter...
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    3. Anonymous user
       
      Oh yes, I hadn’t thought about it, obviously we should know the fuses in this case, everyone knows that we put fuses for household mains 220V-240V in car 12V “cigarette lighter” adapters...

      Anyway, if even moderation answers completely off-topic questions, what can we do ^^
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    4. Anonymous user
       
      Sure, and it’s by asking questions that we learn, but we must ask them in the right place...

      Here, for example: https://bricolage.linternaute.com/forum/electricite-9
      This site is part of the CCM group and is much more suited to a question that, to be fair, has little to do with computers and multimedia ;-)
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    5. verbatim57 Posted messages 11 Registration date   Status Member Last intervention   12
       
      Thank you
      0