If the breaker is listed as a replacement breaker, then you might be able to use it. Why I say might because you will have to determine first if the breaker it listed as such and two, you have to determine that it will be a safe installation. The problem lies is it's listing. In order for a breaker to be listed to be used in someone elses panel, it has to be tested in that manner. If you read the find print, a listed replacement breaker has only be tested as a breaker. It was not tested in other manufacturer panels. I know for a fact there are breakers out there that may appear to fit but when you go install it there is something little that prevents it from being installed. It was designed that way so it would not be installed in another panel. When you install one brand of a breaker in another brand of panel, you assume the risk, not the manufacturer, the vendor who sold it to you, and the listing agency.
