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you can take a 20 or 30 A breaker, put alligator or push on test leads on it, and connect it to an OHM meter (that beeps for continuity)
and tap it on a hard surface, the breaker will open. Maybe I will take a JPEG of the one we cut open so you can see whats inside the breaker
there is a big contact slug on a fairly thin sprung piece of metal.
The breakers would make an excellent impact sensor :c)
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