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Fuse or fusible resistor?

Discussion in 'Electronic Components' started by DaveC, Jun 27, 2010.

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  1. DaveC

    DaveC Guest

    Used in the battery (-) lead of a handheld scope. Schematics unpublished.

    Physically similar to a 1/4 W resistor, color light green. Marked "IE7A" or
    "1E7A".

    Google returns slim results, none promising.

    What type is this?

    Thanks,
    Dave
     
  2. A grammar nanny, eh?

    You must be a big hit at parties ...
     
  3. Pieyed Piper

    Pieyed Piper Guest

    Jeez. Yer an idiot.
     
  4. Pieyed Piper

    Pieyed Piper Guest

    I should have figured that not a goddamned soul actually tried to answer
    the question.

    It sounds like a 'soft-fuze'. That resets itself after tripping.

    There is also a similar device used in hair dryer circuitry.
     
  5. Phil Allison

    Phil Allison Guest

    "DaveC" <

    ** Sounds like a Pico Fuse:

    http://media.digikey.com/photos/Littelfuse Photos/PICO II R251 SERIES.jpg

    Come in fast and very fast ratings with amps rated from 1A to about 15A.

    When they blow, you need a soldering iron to replace them.

    There are various Asians clones too.


    ...... Phil
     
  6. Phil Allison

    Phil Allison Guest

    "DaveC"

    ** Sure that is not the other way around ?

    Pico Fuse would use " 7A LE " as a the marking for a 7 amp fuse.



    ..... Phil
     
  7. N_Cook

    N_Cook Guest


    I take it , that its blown and I also take it that its not charred (fusible
    R don't char or even discolour AFAIK)
    Desolder it and scrape an axial line along its length . Then DVM resistance
    check from either end. If a fusible resistor then maximum R read is what its
    value was near enough.
    FR breaks are usually to one end, normal R usually in the middle.
    Although green is often axial inductor.
     
  8. Littlefuse makes green resistor-shaped fuses. Their logo is an 'L'
    wrapped under an 'F' so their 'LF' could look like 'IE' on a worn part.

    http://www.littelfuse.com/data/en/Data_Sheets/Littelfuse_251_253.pdf
     
  9. DaveC

    DaveC Guest

    Littlefuse makes green resistor-shaped fuses. Their logo is an 'L'
    Thanks, Kevin.

    They way Littelfuse uses a stylized "LF", it could easily be mistaken for
    "1E" or "lE".

    Now to get one...

    Thanks again,
    Dave
     
  10. DaveC

    DaveC Guest

    I take it , that its blown and I also take it that its not charred (fusible
    No, I don't have one. I threw it out with the old battery. :-(
    Someone on-line volunteered to describe the one from his scope.
    I'll not ask him to do a post-mortem on a working fuse. ;-)

    Thanks,
    Dave
     
  11. Pieyed Piper

    Pieyed Piper Guest

    The axial leaded jobs I have seen in hair dryers are high current jobs
    with reed switches inside them. Not the soft break jobs.

    The biggest soft device I recall was 3 Amps.
     
  12. Pieyed Piper

    Pieyed Piper Guest

    If you cannot glean the question from that, you are not only too
    goddamned retarded to be answering it, you are too goddamned retarded to
    be in the group at all, much less being here, acting like you have half a
    fucking brain.
    Nice sig, dumbfuck. It fits you perfectly.
     
  13. Ratings of these beasts in equipment is almost NEVER disclosed - like
    And that's why markings are so important. You can circumvent any need to
    measure.
     
  14. Arfa Daily

    Arfa Daily Guest

    They are complete s

    Just not ones that you

    What I am writing, are incomplete sen

    And don't

    We don't like that on sci

    Arf
     
  15. Tim Williams

    Tim Williams Guest

    Obviously, it's 10,000,000 amperes ;^)

    Tim
     
  16. Jamie

    Jamie Guest

    good one :)
     
  17. James Sweet

    James Sweet Guest


    They won't catch fire but I have seen them char slightly. It's also
    common for them to crack or blow out a small chip of ceramic if
    something shorts and exposes them directly to the line voltage.
     
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