RPS America, Inc., the North American subsidiary of Riello UPS, introduces the Master HP UL, a three-phase Uninterruptible Power Supply (UPS) for mission critical 65-500 kVA applications. This UL® listed UPS is manufactured entirely with IGBT and digital signal processing and features online double-conversion technology for maximum power supply protection and power quality with a clean sine wave output. These 480 VAC, 60-Hz units ensure maximum protection and meet VFI SS 111 classification (voltage and frequency independent) in accordance with IEC EN 62040-3. Master HP UL units can be operated in parallel or single module configuration for redundancy.