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Whats this fused thing on din rail

Discussion in 'Electrics UK' started by Mike2007, 13 Oct 2021.

  1. Mike2007

    Mike2007

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  3. bernardgreen

    bernardgreen

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    It could be a fuse

    Looks like it has come from some equipment that suffered fire or over heating damage
     
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  4. opps

    opps

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  5. bernardgreen

    bernardgreen

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    They can be fitted with slow blow fuses for loads that have in-rush / transient currents that would trip the magnetic part of an MCB
    Also they take up less space than an MCB
     
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  6. JohnD

    JohnD

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    They are also a bit cheaper, which matters if you have a lot.

    When I worked in telecomms I noticed the racks had great long DIN rails full of fuses, with one 6A MCB feeding the rest of the rail.

    Probability of anything ever blowing was very slight, so the manpower cost of changing a fuse was negligible.

    But not impossible.

    Only in exceptional circumstances (about never) would the MCB trip.
     
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  8. bernardgreen

    bernardgreen

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    so later than when Strowger ruled and a jammed selector mechanism would take out the fuse. Either that or the solenoid coils burnt out.

    The ubiquitous Fuse type 44A which when blown closed it's alarm contact to wake up the exchange technician to fix the problem.

    [​IMG]
     
  9. JohnD

    JohnD

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    The Strowgers had all gone for gold recovery.
     
  10. Jackrae

    Jackrae

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    Those springy 'signalling" fuses were great things. We used them offshore on F&G and ESD systems. Took me quite a while to source replacements; eventually got them from a company supplying Network Rail, so I presume were also used for track signalling systems. When you have a cabinet stuffed with literally hundreds of them, you can see in an instant which one has let go by its spring connector sticking up.
     
  11. mattylad

    mattylad

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    Din rail mounted fuseholder.
    I use them in control panels, esp when we only need <1A fusing.
     
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