... .5KVA,1KVA,1.5KVA 1. SummarySVC-D Series AC automatic voltage regulator is the latest product studied and produced by ourselves. ... protection functions on delay, over-voltage invert-delay, lack voltage, over load invert-delay, lack voltage, over load, over temperature, ... /1minInsulation Resistance>5MΩEnvironmentTemperature:-10oC~+40oC Humidity:<90% SVC-D Series Fully Automatic A.C. Voltage Regulator