Might be related to a very INDIRECT connection to FPE.
After FPE went TU, there were a lot of installed panels so a big market for someone to support. When GTE Sylvania got broken up, the distribution equipment factory was not bought by anyone and was going to close, so the executive bought it and named it Challenger. They inherited supporting Zinsco, then he got them into making other aftermarket breakers for other mfrs, one of which was FPE. Eventually there were complications of all that and then Challenger was later bought by Eaton, who also owns Cutler Hammer. But Eaton did NOT continue on with the Zinsco and FPE aftermarket stuff because of all the problems, however some people assumed they did. They sold that stuff off to American Circuit Breaker, who became Connecticut Elec., who still sells it. Yet still, a lot of people get confused about all of this and jump to incorrect conclusions based on having only pieces of the information.
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