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Fuse carriers with fuse fail neons

Sailbadthesinner
I have encountered a distribution board that uses RT18-32X 10x38 fuse carriers that have a built in neon connected across the fuse to indicate fuse failure.

Cute feature but my immediate thought was that these do not provide isolation of the outgoing way.  Are they suitable for use in a DB ?
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  • Former Community Member
    0 Former Community Member
    I believe the circuit resistance for the neon (as opposed to LED) is around 570KOhms


    Personally, I wouldn't want to be relying on that particular type of fuse holder to achieve circuit isolation by withdrawing the fuse whilst leaving the neon in place.


    In a DB, these is potentially the option of operating the main switch of the DB for isolation purposes - but that does seem a bit brutal in an operational environment.


    I'm not entirely clear that if the fuse holder is moved to the position where the fuse can be withdrawn then the neon is also isolated  - but clearly the holder can be returned to the "closed" position even if the fuse is removed and returning the neon to circuit


    Regards


    OMS


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  • Former Community Member
    0 Former Community Member
    I believe the circuit resistance for the neon (as opposed to LED) is around 570KOhms


    Personally, I wouldn't want to be relying on that particular type of fuse holder to achieve circuit isolation by withdrawing the fuse whilst leaving the neon in place.


    In a DB, these is potentially the option of operating the main switch of the DB for isolation purposes - but that does seem a bit brutal in an operational environment.


    I'm not entirely clear that if the fuse holder is moved to the position where the fuse can be withdrawn then the neon is also isolated  - but clearly the holder can be returned to the "closed" position even if the fuse is removed and returning the neon to circuit


    Regards


    OMS


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