ECN Forum Forums General Topics of the Trade Non-US Electrical Systems & Trades Will an American 2-pole brkr function properly if wired to a European 220v 50h sys ?

Yep, that's called 1+N breakers. They only fuse the phase but also switch the neutral upon tripping (older types were actually obviously 2 devices in 1 case with only 1 handle). Autria (or at least Vienna) uses them extensively. We even have 2 fuses in older installations.