Take the old breaker with you , match it up with the new . That way you get the right kind of breaker. Some fit differently, easy to match them up looking at them
So the new breaker will be a dual pole 15amp or 20amp?
If the wire on the AC has just a normal plug , everything 15 amp
Frankie is right.
When he says AC plug, he talking about the male end
The receptacle is the female thingy.
The plug configuration will identify what the female configuration needs to be.
That's gonna tell you the amps the single pole breaker should be
