KB Electronics KBVF AC Inverter operates standard 208-230 VAC 3-phase AC motors, with 115 and 230 VAC input single phase. Controls 50, 60, and 50/60 Hz motors. Provides quiet motor operation with a 16 kHz switching frequency. Compact Size with regeneration protection. More than 200% starting torque with Power Start. w/GFCI software.