How does 3 phase power switch to single phase power at a circuit breaker panel?

Question

On our house we have a 3 pole / 3 phase main breaker but then everything else is 240v single phase inside the house, what sort of wiring connection happens between the 3 phase power and the rest of the house?

In: 1

Answer 1

to my understanding a 3phase line is just 3 separate lines at a breaker box each phase getting its own breaker.