Switched source with forced ventilation - built-in fan, prepared for connection with battery (with safety backup) in grid box with wired connectors. Size: 275 x 50 x 115 [+/- 2 mm]. Input = 176 ÷ 264VAC, Output=54VDC@4.5Amp with 0.5 / 1 / 2Amp for battery. Protections: SCP, OLP, OVP, UVP, OHP. Optical LED signaling. For DIN rail mounting, a PSDIN2 bracket is required. Efficiency: 85%.