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Vacuum contactors work fine for both AC and DC. They do not use magnetic blowouts. They are a bit more expensive than a DC contactor. And of course you'd need 3 phases instead of 2.
I use a DC contactor from the battery pack to the controller. If you shut off the power to the controller, the motor (AC or DC) will coast (or the AC can regen, depending on how your controller is set up).
An AC contactor (perhaps with an overload block) would go between the controller and motor. Are you using the contactor for reversing?
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