FirstLine PLT UPS, 20 kVA/ 18 kW, with Input Isolation Transformer and Output Autotransformer, no internal batteries. Input: 480V; Delta 3W + Gnd, 3 Phase: Voltage Range: +15%/-20%, 0.9 power factor with AFC technology, Input Frequency: 50/60 +/-5.0, 60Hz +/- 0.01Hz Free Running, Output: 480Y/277V; 3-Phase, 4W + Gnd, Static Voltage Regulation: +/- 2%. Bypass Input Frequency Tracking Range: +/- 5Hz. Input Current THD: < 1% @ 100% load, < 2% @ 50% load and < 5% @ 10% load. Voltage THD: <1% Linear Loads, <2% with crest factor 2.5 to 1. Inverter Overload: 125% for 10 minutes, 150% for 60 seconds, Bypass Overload: 400% for 10 seconds, 1000% for1/2 line cycle. Input, Output and Bypass Switches, Internal Bypass, Rectifier/Charger, Transistorized IGBT PWM inverter, Static Bypass Switch (continuous duty), Emergency Power Off (EPO) push button. Operator Control Panel (three parts) Mimic, LCD and Keypad display including menu driven logic in conjunction with panel mounted switches, Microprocessor controller metering and alarms, Inverter Start/Stop switches, RS-232 Interface Port, (5) sets of form-C dry output contacts, MODBUS and UL1778 Listed. Does not include any internal batteries. Dimensions (each): 72.41" H x 23.13" W x 34.47" D; [1,839.3 mm H x 587.4 mm W x 875.6 mm D] Weight (each): 1,189 lbs.; [539 kg]