LED: This Green LED will illuminate when input AC power has been applied to the unit and DC power is available, Fuse: If the AC/DC primary circuit load or if the DC output load increases, causing the input AC current to the DC power supply to exceed the 2 Amp maximum rating, this internal fuse shall open and, This will cause the DC power supply to loose all DC power output but AC power output to the NEMA 5-15 Receptacles will remain active, This unit connects to a 120 VAC, 3 wire source and provides 6 DC outputs at 12 Volts, NEMA 5-15 Receptacles: These two AC output female connectors will provide 120 VAC and UL rated at 15 Amps total