Single Phase 480 - 120/240V Transformer

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infinity

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I think that what Jraef is saying is that if the primary is 1Ø, 480 volts you don't have much of a choice but to use a 2 pole breaker in the 3Ø panel.
 

infinity

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You can use a three pole breaker but you ultimately only utilize two lines from the source.;)

Very true but the OP did specifically ask about a 2 pole. I'm guessing that maybe he's concerned about an imbalance of some kind.
 
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