Input Power • Nominal input voltage: 100–277 V~ • Frequency: 50/60 Hz • Current consumption, fully loaded (typical): 0.5 A (277 V~) 0.7 A (230 V~) 1.0 A (120 V~) 1.3 A (100 V~) Power Supply Output • Nominal output voltage and tolerance: 24 V- / ±1%, 75 Power Draw Units (PDUs)* • 2.5 A SELV / PELV / NEC® Class 2 • Power Draw Units (PDUs): Supplies 75 PDUs maximum* Note: This power supply is NOT rated for use with motorized shades/window treatments. Environment • Ambient operating temperature : 32 °F to 131 °F (0 °C to 55 °C). • Ambient operating humidity: 0% to 90% humidity, non-condensing. Indoor use only. • Unit generates heat, maximum 28 BTU / hr • 60 °C maximum calibration point temperature.