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I think Astro is wondering about the change of polarity when in regen, when current is flowing back to the pack, and how this affects the polarity of the contactor's blowouts.
This is a non-issue because contactor blowouts are meant to break high amounts of DC current in the event of a DC controller failure, as stated above. However, unlike a DC controller, an AC controller is highly unlikely to fail in a closed/shorted state, making a contactor with blowouts unnecessary.
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