The ACS550-U1-078A-4 is a discontinued three-phase AC drive from ABB's ACS550 series, designed for US installations with NEMA compliance. It operates at 380-480 VAC, 50/60 Hz with a current rating of 77 A, featuring UL Type/NEMA 1 enclosure. This model has been replaced by the newer ACS580-01-077A-4 unit.
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