Hot Left Pole

—in the philippines single line pole breakers are used for line to neutral connection line 1 is hot and one line for ungrounded wire. And double pole breakers are used for line to line with neutral as the third line connection that is the line 1 is hot and the line 2 is hot thats why they need two pole breaker very simple explanation

—I’m confused about Double Pole Circuit Breaker. I have seen a lot of pictures/videos which use one hot live wire and one neutral wire as input and the corresponding output for each of them, whereas when I see the setup in the service panel box it doesn’t have the neutral input into the breaker itself, it takes two hot live wires (from the service panel buses/two phases) and two outputs accordingly. I am confused actually.

—i have a circuit breaker labelled “oven” that has a lever handle that is two-wide instead of like the normal breakers that I can turn room lights and room outlets on/off. Would that double handle labelled “40” mean that it is 240V? (I’m in USA) thanks in advance for any help with this.

—very helpful. can i use AC MCB with a solar panel?