... in UPS off mode 2.Zero transfer time 3.Smart RS-232 communication port 4.Optional SNMP card Key ... THD9.Expandable backup time10.Generator compatible11.Cold start12.Load/Battery power meter display13.Overload, on-line, battery status LED/LCD14.Advanced ... phase + GND THD< 3% (linear load), < 5%( nonlinear load) Power Factor0.8 Short Circuit ProtectionCurrent limit, turn off automatically, Switch ...