Can someone identify these and perhaps provide a little backstory on them? I'm particularly interested to learn if they are a thermal only design given some recent experience (not tripping on a direct short that vaporized about two inches of #12 THHN.) A Square-D employee referred to them as "Type MM" but I can't find much online using that name other than some relatively modern-looking miniature C-H breakers.
thanks in advance...
thanks in advance...
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