Major problem recently. I put a surge protector on the LED security light down in the shed (off the house supply), after a previous security light blew.

While I was away, the house power tripped out, and I had to diagnose the problem from 200 miles away. Managed to get power back to part of the house, but it was only when I got home that I found the power was being tripped out by the faied surge protector - must have gone short circuit.