The Fuji FRN250AR1S-5U is a FRENIC-HVAC variable frequency drive rated for 250 HP on a 3-phase 575 V supply, in a UL open type enclosure. This is the standard chassis format for panel mounting — no conduit entry, no disconnect, just the drive ready to wire into your MCC or control cabinet.
250 HP at 575 V three-phase puts this drive squarely in the heavy commercial HVAC and industrial fan/pump class. The 575 V rating matches North American 600 V class systems common in larger plants and institutional buildings — it's not a 480 V unit, so verify your line voltage before committing the BOM line. The UL open type designation means the drive ships without an enclosure for installation inside a UL-listed panel.