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Wrong Fuse?? Harmful??

Discussion in 'Amp Tech Center' started by Joe M, Oct 22, 2020.

  1. Joe M

    Joe M Super Moderator Staff Member

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    As most of us do, with way too much time on my hands, I find things that I probably never would normally...latest discovery, for whatever reason, I checked the fuse in one of my amps. Says it’s supposed to be 1.5 amps, slo-blo; the one in the amp is 1 amp, slo-blo. I know you should never use a higher value fuse, any problem with the lower value?
     
  2. Peegoo

    Peegoo Poster Extraordinaire

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    No, but it means it may blow when it really should not.

    The danger is when a fuse with a higher amperage rating is used. Example: in the old days of glass fuses (before circuit breakers) were used in power panels for homes, it was sometimes a "quick fix" to place a penny behind a blown fuse when a spare fuse was unavailable. Many houses caught fire as a result.

    Slo-blo is necessary because amps can draw transient current far in excess of the normal operating current of a circuit. The 'slo' type requires an extended over-draw condition to blow. If the amp calls for a 1.5A slo fuse and you install a standard fast-acting fuse rated for 1.5A, chances are good it will blow in use.
     
  3. elpico

    elpico Tele-Afflicted

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    The smallest fuse you can get away with (without nuisance failures) is the safest fuse, regardless of what it says on the amp.
     
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