... relay type automatic voltage regulator Summary AVR-III series is the high precision and intelligent automatic voltage regulator,that is ... proudcts.It takes smart,ligtness,high efficiency,wide stabilize,no waveform distortion,high cost performance of AVR-II. ... 5 relays. 2,Accuracy of voltage stabilization: 220±8% 3,Frequency: 50/60Hz4,Low-voltage protection: 188V±4V, after low-voltage protection, the ...