Dorman Smith loadmaster breakers

[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 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 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.

 

[markc123]

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

 

[westward10]

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.

 

[buzzlightyear]

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

do Yorkshire men still play with a penny in the pocket .

 

[Toneyz]

Are you sure it wasn't a fake?

 

[MFS Electrical]

Are you sure it wasn't a fake?

Guaranteed real.... was from a local authority building all of the installation bumf was still there from dorman from when it was new

 

[MFS Electrical]

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.

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