That is a GFI breaker the neutral is in the wrong place that's why it keeps popping and you're welcome I've been doing this for 27 years a better answer this question correctly😂😂😂😂
I had all the theory, and this was even my assumption until i was like, “lemme not assume this”, even drew myself a diagram. Tho i didn’t draw out the schematic of the sense transformer which if I had, I would have realized the neutral has to go into and OUT of the breaker but stupid me was like “thats just so the electronics have power.” LOL WHAT?!
I commented this morning and I was dead on. Using a two pole GFCI as a single pole and not landing the circuit neutral onto the breaker. In addition if he is using that for a general purpose lighting and receptacle circuit, this a pretty good chance it's supposed to be a 15 amp, not a 20, although I have seen homes where only 12awg and larger is ran, but that's a topic for a different discussion.
I couldn't tell if that original video was trolling. Or trying to make a riddle knowing what he was doing. Or if he flat out, just didn't know how to connect it Thanks for the explanation.👍