The Fuji FRN350AR1S-4U is a FRENIC-HVAC variable frequency drive rated for 350 HP on a 3-phase 460 VAC supply. It's built as a UL open type, meaning it's intended for installation inside an enclosure — not a standalone NEMA-rated box. This is the drive you'd spec for a large HVAC fan, pump, or compressor where the motor load is a known constant-torque or variable-torque curve. At 350 HP and 460 V, this drive pulls serious current on the line side — expect to land it with appropriately sized lugged cable, not finger-safe terminals. The FRENIC-HVAC series is Fuji's purpose-built line for building-services applications, so the control algorithms are tuned for fan and pump curves out of the box.
The 350 HP rating at 460 V three-phase tells you the motor it can drive — a 350 HP induction motor running on a 460 V system. The UL open-type construction means the drive has no built-in disconnect or enclosure; it's designed to be mounted inside a panel or cabinet that provides the environmental protection. That's typical for a drive this size — the enclosure is handled at the system level, not inside the drive chassis.