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D Skelton

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Can anyone else explain how three MCB's could get fused together like this? And when I say 'fused', I mean even ramming a screwdriver between them couldn't break them apart!

My thoughts are a loose/incorrect connection to the busbar. Mind you, you'd have at least thought they would have tripped long before reaching this state.

Also, note to any of you who come across anything similar, bag it up before it goes in the van otherwise it'll stink to high heaven of the worlds worst and most pungent smell for weeks!

[ElectriciansForums.net] Melty goodness :D [ElectriciansForums.net] Melty goodness :D [ElectriciansForums.net] Melty goodness :D
 
I'd hazard a guess that the reason they didn't trip is because that's the busbar side of the connection (incoming) and the overload state is only monitored on the out going side.

Main problem of the meltdown is more than likely due to the recall issue as already stated.
 
I doubt the burning on MCB's as shown would have caused an overload current. At best, occasionally the heat from a poor termination or an internal fault may carry through into the mechanism and cause the thermal sensor to initiate tripping.
 
I had exactly the same problem about 2 months back, wish I had taken photos now. Mind you it was Crabtree starbreakers that were affected to me and I'm certain they weren't part of the recall.
I just put it down to a loose connection!
 
Extra-box thinking maybe, but might it have been an extremely low Ze/ super high scc or would that have blown the casing apart?

Ive had this before in an industrial scenerio though and put it down that, high fault current. Wasnt as bad as that though just melted a hole in the side of the MCB. Burnt out wires in the isloator caused the short circuit.
 
Can anyone else explain how three MCB's could get fused together like this? And when I say 'fused', I mean even ramming a screwdriver between them couldn't break them apart!

My thoughts are a loose/incorrect connection to the busbar. Mind you, you'd have at least thought they would have tripped long before reaching this state.

Also, note to any of you who come across anything similar, bag it up before it goes in the van otherwise it'll stink to high heaven of the worlds worst and most pungent smell for weeks!

View attachment 13414 View attachment 13415 View attachment 13416
looks like something erupted from out of the middle one....like a scene from aliens....
 

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