i am not for sure what and where you are doing this and for what reason, but a breaker called a tandem is made to fit the slot of a single pole breaker. this tandem breaker will have two breakers in one. also made is a wafer breaker which is half the size of a normal single pole breaker and you can get two where one usually goes. these different breakers are manufactured to fit their own panels. some may change out with other brands, some may not. if i was wanting two breakers where one goes i would probably take that breaker out, note the brand of panel and go to an electrical supply house and explain the situation to them. this advice is for a single pole circuit only. if you are confused, pay the pro. thanks, buddy
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