... has models from 500VA to 100KVA optional, high display resolution, high stability and performance, has full protections, basal ... position switch for frequency settings4) IGBT / PWM circuit5) High load and frequency stability6) ±1 waveform low distortion 7) V ... Current, Power, Frequency, LED digitalProtections functionOver voltage, over load, over temperature Short, over current latches output OFF and ...