There's some internal factory connections that aren't plainly seen in the lower half of each contactor (coil/overload area).
If you have it wired correctly, when there's an overload to any one of the 3 phases of either motor the appropriate "heater" causes the overload contacts to open, which acts the same as the stop switch, and shuts the whole unit down.
NO restart 'till the overload rest button (center, at the bottom of each unit) is depressed, resetting the overload contacts.
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