"John Rumm" wrote in message
...
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.

Sometimes they just fail. Infrequent but it happens.

Adam