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I have had both. If I remember correctly, the relay board is mounted vertically in the white face and horizontally in the black face. Not sure of any other major differences.
From what I know the white is the earlier model with a different relay section mounted vertical. Other than that I believe there is a model that takes a 600v transformer but of all the 300a's ive never seen one . Everything else is the same from what I see.
I'm looking for factory settings 1 through 59 for a AT 5555 n2 or AT500 M2 I only wrote down half the values feel like a idiot I need help will be appreciated
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