Totally exploded Hager RCBO (RCD/GFI with overcurrent trip)

I've always pondered whether cramming the RCD/GFI circuitry into a breaker designed to break up to 10,000A of fault current was a compromise. It turns out it does open up the possibility of an internal flashover.

My guess for the fault scenario that caused this is that the switching contacts welded shut allowing current to continue flowing, the electronic module tried to trip the welded mechanism, and then burned out initiating an arc that allowed the live to flash over to the neutral.
John Ward featured a similar breaker failure. His video is here:-
https://www.youtube.com/watch?v=TRUBlZCNo8U

I'd suggest resetting these breakers with extreme caution if you believe there to have been a major fault condition that may still be present. The presence of the Live and Neutral connections in the same enclosure raises the risk of plasma/explosion hazards.

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