What is the purpose of the twin single pole breaker?

Connect two 2-pole breakers together? two breakers in one slot It will then slip in without being pushed into position 9 delete the slot on the panel covering the breakers Reinstall the panel Switch the two slot In residential homes, the 1-inch breakers usually used are single-pole breakers that take up one slot on the panel Double-pole breakers are

two breakers in one slot So if the manufacturer has designed a panel to take only full height breakers, then you can't use the pancake breakers or the twins