On Jan 26, 11:42*am, Grant Erwin wrote:
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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A contactor and an overload relay together are called a starter.

The heaters in the overload relay are interchangeable (to match
the current requirements of the circuit), and are intended to
heat either a bi-metalic element or a meltable metalic compound
(later models may be fully electronic) which allows an internal
switch (normally used to carry current through the contactor coil)
to open which breaks the holding curcuit and allows the contactor
points to seperate.

dennis
in nca