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fuses

Discussion in 'Hobby Electronics' started by eltan, Dec 1, 2006.

  1. eltan

    eltan Guest

    Hi all,

    How can one identify whether a blown fuse is a fast blow fuse or slow blow
    fuse without any other information supplied?

    thanks
     
  2. Phil Allison

    Phil Allison Guest

    "eltan"

    ** In general, you simply cannot. If the fuse has no markings and the
    fuse wire is vaporised all you have is a glass tube with end caps.

    However, a blown fuse is not much use to anybody so the point is moot. What
    you may importantly need to know is what sort of fuse to replace it with.

    For that, you need to consider the application, examine any markings on the
    equipment that indicate fuse type and rating plus use a bit of electronics
    common sense.

    It is very risky to assume the fuse that you find in something ( whether
    blown or not) is the correct type.

    Others may well have been there before you and tampered or the factory may
    even have installed the wrong type.

    I see it all the time in service work - I now have a nice collection of
    25, 30 and even 50 amp fuses recovered from gear that required no more than
    a 2 amp fuse.

    Now, if you would like to come back with details of the SPECIFIC question
    you ** REALLY ** needed answering - maybe I can help.




    ....... Phil
     
  3. eltan

    eltan Guest

    Also, when replacing a fuse, can the amperage be higher?

    Thanks Phill.
     
  4. Phil wrote:-


    Others may well have been there before you and tampered or the factory may

    "eltan" wrote----


    Also, when replacing a fuse, can the amperage be higher?

    Thanks Phill.



    ****Thick as!!!!!

    Brian Goldsmith.
     
  5. Simon

    Simon Guest

    I took your advice and now I have nowhere to live! Gah! What sort of
    advice do you call that Frank!??!?!?!
     
  6. jasen

    jasen Guest

    read the code stamped into the cap.


    in my (limited) experience

    slow blow have wire wound on glass fibres (or similar material)
    fast blow have a spring inside.
    normal have just wire.
     
  7. Phil Allison

    Phil Allison Guest


    ** The Good Lord may well forgive this asinine Kiwi clot cos he knows not
    of what he speak ....


    But never me.




    ....... Phil
     
  8. Bob Parker

    Bob Parker Guest

    In my experience, the fuses with "T" after the rating are slow-blow
    ones. "T" means "timed", or so I read once.

    Bob
     
  9. eltan

    eltan Guest

    Thanks Bob, I'll look at that when I buy some slow blow & fast blow fuses.
     
  10. Andy

    Andy Guest

    Bob,

    I was once told by a German tech that the "T" came from the german word
    "Trage", which translates to "slow" or "lazy". Now there's some useless
    trivia for you.....

    Andy
     
  11. Bob Parker

    Bob Parker Guest


    I remember seeing that word in relation to delay fuses, maybe on a
    packet of them, but never got around to translating it. Thanks for the info!

    Bob
     
  12. If the OP specified what the fuse was for, it might just make life a little
    easier.

    As for ridiculous sized fuses, I've come across it before, most common I've
    seen is person X owns a 12v regulated PSU for radio/tv whatever, buys
    multiples of fuses at a hit, rated at 20 or so amp 250v, takes them home and
    sticks then in the 12v and 240v sides, not thinking it only takes a few amps
    at 240 to get their 20amp 12v.
     
  13. Phil Allison

    Phil Allison Guest

  14. Bob Parker

    Bob Parker Guest

  15. Phil Allison

    Phil Allison Guest

    "Bob Parker"


    ** Ok, how did you get the " a " with two dots to appear?

    CNTRL ???




    ....... Phil
     
  16. Bob Parker

    Bob Parker Guest


    Nothing that sneaky. I followed your link and simply copied and
    pasted the word complete with the little dots from that web page!

    Bob
     
  17. Bob Parker

    Bob Parker Guest

    Windoze XP has a little-known function you can get at from All
    Programs -> Accessories -> System Tools -> Character Map which lets you
    copy all those weird chäräctérs. :)

    Bob
     
  18. Phil Allison

    Phil Allison Guest

    "Bob Parker"


    ** The surprising thing is that " trage " WITHOUT the two dots has another
    meaning.




    ........ Phil
     
  19. Bob Parker

    Bob Parker Guest


    Well how about that! Who said this newsgroup's not educational? :)

    Bob
     
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