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Discuss Dorman Smith loadmaster breakers in the Electrical Forum area at ElectrciansForums.co.uk.

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  1. MFS Electrical
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    MFS Electrical Forum Mentor

    Location:
    Scotland, Inverclyde, Greenock
    Business Name:
    MFS Electrical
    Replaced an old TP&N Dorman Smith DB the other week there with a nice shiny new one, So being a nosy sod and wondering why old dorman smith breakers don’t ever seem to trip I decided to drill out the rivets and have a peek inside.
    All I can say is no wonder they never trip:eek: there is no coil inside to trip it instantaneously in the event of a short circuit! they only protection they provide is via a (quite hefty) copper strip so really only an overload or a fault of epic proportions is ever going to trip these bad boys.
    Pics to follow once I drill out the rivets and carefully dismantle another the first one is in about a million pieces on my desk:rolleyes: i drilled out a modern breaker proteus side by side for comparison that too is in a million pieces but I have lots more and I’ll drill them out and post pics for comparison.
     
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  2. markc123
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    markc123 Forum Mentor

    Location:
    Yorkshire.
    Dorman Smith Loadmaster ... have always said these new breakers have nothing on the old dormy smiths ... no wonder haha.

    Look forward to the pics!

    P.S I have about 20 loadmasters all different breaker sizes brand new unboxed, when I saw this thread title I thought I was going to make a few quid haha
     
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  3. westward10
    Online

    westward10 In echoed steps I walk across an empty dream. Staff Member Moderator

    Top Poster Of Month

    Location:
    Northamptonshire
    Was it a Type 3 or Type 4. If no longer legible you can tell them apart as the Type 4 has ridges either side of the switch toggle whereas the Type 3 is smooth.
     
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  4. buzzlightyear
    Online

    buzzlightyear still kicking sand, before pushing up daisies . Electrician's Arms

    Location:
    star command
    do Yorkshire men still play with a penny in the pocket .;)
     
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  5. anthonybragg
    Online

    anthonybragg Electrician's Arms

    Location:
    NORTHAMPTON
    Business Name:
    CHARLTEC ELECTRICAL LTD
    Are you sure it wasn't a fake?
     
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  6. MFS Electrical
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    MFS Electrical Forum Mentor

    Location:
    Scotland, Inverclyde, Greenock
    Business Name:
    MFS Electrical
    Guaranteed real.... was from a local authority building all of the installation bumf was still there from dorman from when it was new
     
  7. MFS Electrical
    Offline

    MFS Electrical Forum Mentor

    Location:
    Scotland, Inverclyde, Greenock
    Business Name:
    MFS Electrical
    Can’t remember at the moment will have a look I’ve left them in the office and haven’t had a chance to get back there today hectic is not the word :rolleyes:
     

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