Not sure lightning will be stopped by a 6mm gap in a breaker.
IF your system is plugged into separate circuit(s), (as it should be) simply turn the breaker(s) off, back on after storm passes.
There is an extended surge protector thread going on at the misc forum right now, and I mentioned that getting back to my outlets is a b, so what I said I had been doing was tripping the breaker(s) during atmospheric electrical activity (which we are getting a lot of as of late). @jea48 informed me on that thread that a massive surge could easily jump across a tripped breaker. I have started unplugging my stuff during T’storms, even though it is a bit more of a PITA. As a matter of fact, my stuff is unplugged as I am typing this stuff. Activity last night and gray skies today. As I get older my paranoia increases.