What is the upstream input voltage range of the UPS5000-H?

For the Huawei UPS5000-H (380/400/415 V class), “upstream input voltage range” refers to the acceptableAC mains (rectifier) line-to-line input voltage windowthat the UPS can tolerate while maintaining operation. Huawei specifies a wide mains input voltage range of138–485 Vac (line voltage)to improve adaptability to weak or fluctuating power grids and to reduce unnecessary battery usage when the utility voltage sags or rises within allowable limits. Within this overall window, the UPS may applyderating rulesat lower voltages (for example, full-load operation is typically guaranteed only above a higher threshold), but the upstream input can still remain connected and the UPS continues supplying the load according to its control strategy and available capacity. The other options do not match the upstream AC input range:360–600 Vis commonly associated withbattery DC voltage ranges,220–240 Vis single-phase class, and380–415 Vrepresentsrated voltage, not the full acceptable upstream range.