Are Circuit Breakers Interchangeable

What is the maximum number of circuit breakers allowed in an two breakers in one slot Both “hots” need protection from overcurrent, so we use a double-pole breaker that accepts two wires instead of one These breakers are larger two breakers in one slot These breakers are designed to fit into a single slot in the breaker panel, allowing for the connection of multiple circuits in the same space

two slot You can combine branch circuits and then feed both of them from a jumper to a single breaker You now have a spare breaker slot If you do not