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Polarizing the generator field sets up a residual magnetism in the field shoes. It's this magnetic field that provides the power needed to open the cut out relay as soon as the generator is up to rpm so that the generator can come on line.
The old cut outs have some little spot welds to hold the can to the base. You can usually detect them with the cut out off the generator and turned up side down. They are just on the edge of the can and base there. Careful grinding is required to separate the can so that the cut out points and wiring can be inspected for condition.