I picked up some '70s era GE NEMA 1 magnetic contactors, NOS, military
spares. They have overload relays that accept heater inserts and are
adjustable within ±15% of nominal via a thumbwheel. Clearly the heater
inserts are literally just that - they heat the inside of the overload
relay. Beyond that, though, I'm stumped. I'm trying to figure out how
these overload relays work. Anyone know? The overload relay number is
CR124 if that helps.

Grant

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