Regarding -submersible residential style water pump relays- pumps fitted with a three wire cable which terminates into a submersible pump relay box--the red wire feeds the starting winding in the pump motor.
I understand the orange wire coming from the capacitor feeds across the relay contact, down the red wire to the starting winding. After the pump motor starts the contact drops out.
The ?-- Do those submersible pumps have drop out clutches or the like that fault the 'red wire starting feed' to the pump well casing, after motor starts, perhaps? I understand that would be an induced 'ground fault'of the sorts but it would be momentary and would create that difference of potential to allow relay to drop out contact. Attempting to understand what happens down at the motor, that creates that difference of potential needed for the yellow hot, to feed through the coil?