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Glass Tube Fuse Identification

Discussion in 'Datasheets, Manuals and Component Identification' started by Tim Griffin, Oct 27, 2015.

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  1. Tim Griffin

    Tim Griffin

    2
    0
    Oct 27, 2015
    Hi all;

    I have a glass tube fuse with the markings 250V 3/3 1A on it.

    Could someone enlighten me as to what the "3/3" designation means?

    Many thanks,
    Tim
     
  2. shrtrnd

    shrtrnd

    3,701
    462
    Jan 15, 2010
    I don't have the information at my fingertips, but it will designate the physical size of the fuse.
    There are a lot of different physical packages for fuses, and that is supposed to identify the type you have.
     
  3. Tim Griffin

    Tim Griffin

    2
    0
    Oct 27, 2015
    Ah, okay. Is there a way I know whether the fuse is a fast-blow or slow-blow fuse?

    Tim
     
  4. shrtrnd

    shrtrnd

    3,701
    462
    Jan 15, 2010
    Have you got a manufacturer logo on the fuse? The Littelfuse or Bussmann logo, or whomever made it?
    That'll tell you exactly were to look for what the '3/3' denotes.
    In simple terms, (that may not always hold true?):
    A fast blow fuse is a single element, one, fine-wire element ( in a 1 amp fuse).
    A slo-blo fuse will be a wire wrapped around a ceramic element (to take the heat, allowing time for a slower blow), or could be a spring-loaded element with many different appearances, depending on mfgr; or a variety of
    other appearances depending on who made it.
     
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