nospam wrote:

The lights would not work this evening. I found the fault was the mcb.
How common is mcb failure, what causes it, and what are the sympoms?
I've never known it to happen before.

Generally it is fairly uncommon with most brands. However I have seen it
happen with some Proteus MCBs made by Geyer.

The symptoms in that case were that sometimes when you switched them on
mechanically they failed to make any electrical connection. Turning off
then back on again would often fix the problem.


--
Cheers,

John.

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