... 2.High precision, screen digital display: frequency, voltage, current, power, power factor. 3.Quick response for status, regulating voltage response for ... multiple protection and alarm functions Voltage filter DC/AC inverter AC/DC Rectifier filter Input no fuse switch Output ... *800*1020490GTP616060600GTP611001001500*800*1020850GTP611501501800*800*10201200GTP612002001800 variable-frequency power source