I had to replace several FPE switches. Replacement Connecticut Electric breakers look like they should work - the case is the right size, the electrical pins are generally set up correctly, etc. But the Stab-Lok pins on a replacement Connecticut Electric breaker are slightly wider than the original FPE configuration. . This was supposed to potentially provide a better electrical connection than the original problematic FPE switches and panels, but the result was that I literally couldn't fit the electrical contacts on these replacement switches into the bus bar in the FPE panel. I ended up sending the items back.
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