... of its on-line design, unlike the backup-type UPS, its input voltage is constantly adjusted, filtering. When the mains ... , SMS and other monitoring methods)ProtectionDC input over-voltage, under-voltage, overload, over-temperature, short-circuit, output over-voltage, ... the standard of YD/T983-1998 AInsulation Resistance> 2MΩ(500VDC)Insulation Strength2121VDC (AC Input to ground, AC Output to ground, ...