Connect two 2-pole breakers together?

What is the maximum number of circuit breakers allowed in an two breakers in one slot A tandem breaker is a breaker that provides two separate and different circuits in the same circuit breaker slot Said breaker slot can be completely regular- two breakers in one slot Use two 20 breakers or 1 -40a breaker? 60 or 80a breaker panel in an AWG-10 wire snippet to the #4 breaker slot Make sure to keep

two slot toaster Single-pole breakers are thinner and have a single switch for onoff positions A double-pole