This is ideal for ITE panels (purchased from Siemens) with non-restrictive panels available on the panel. No space allowed in your panel you how to use it. If you don't know how it works, educate yourself or hire an electrician. Also, don't overload the panel. I found www.startribune.com/how-to-know-when-tandem-circuit-breakers -can-be-used-aka-cheater-breakers/140688183/ , a great article showing what not to do.
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