... over load invert-delay, lack voltage, over load, over temperature, machine malfunction and so on. They have digital display, blue-screen ... display and it can show the working status of the machine. When the machine works abnormally, on the panel there is corresponding ... 1minInsulation Resistance>5MΩEnvironmentTemperature:-10oC~+40oC Humidity:<90% SVC-D Series Fully Automatic A.C. Voltage Regulator