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Also, even with the motor stopped, reversing it causes the 20 amp SP breaker to trip ? Before, & after the control was changed.

"That was an important piece of information, don't you think?"
-- Lieutenant J.G. Daniel Kaffee, A Few Good Men

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Dnk, that controller has a 15A line fuse built in, but no output fuses. Since the 20A CB opened instead of the fuse, I'll guess a little further that the line and neutral are reversed somewhere.