Yeah it’s usually a 2 unit wide thing, that connects to a max of 4 breakers that protect the (usually) 16A circuits. However recently it has become the norm to just integrate the breaker and the ground fault protection and those can be as thin as 1 unit. So the size of a normal breaker.
We do it both ways. New construction vs old construction basically. I never put a GFI in a breaker box tho. I assume it’s just a fatter breaker.
Yeah it’s usually a 2 unit wide thing, that connects to a max of 4 breakers that protect the (usually) 16A circuits. However recently it has become the norm to just integrate the breaker and the ground fault protection and those can be as thin as 1 unit. So the size of a normal breaker.