This part is a kind of semiconductor called SDR-480.

Function of this product has 480W Single Output Industrial DIN RAIL.

Manufacturers : Mean Well

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Some of the text within the PDF file :

480W Single Output Industrial DIN RAIL with PFC Function Features : SDR-480 series High efficiency 94% and low power dissipation 150% peak load capability Built-in active PFC function, PF>0.94 Protections: Short circuit / Overload / Over voltage / Over temperature Cooling by free air convection Built-in constant current limiting circuit Can be installed on DIN rail TS-35/7.5 or 15 UL 508(industrial control equipment)approved EN61000-6-2(EN50082-2) industrial immunity level Built-in DC OK relay contact 100% full load burn-in test 150% peak load capability 3 years warranty SE PQ M IF 47 GL SPECIFICATION MODEL DC VOLTAGE RATED CURRENT CURRENT RANGE RATED POWER PEAK CURRENT PEAK POWER Note.6 OUTPUT VOLTAGE ADJ. RANGE LINE REGULATION LOAD REGULATION SETUP, RISE TIME HOLD UP TIME (Typ.) V [ ... ]

SDR-480 PDF Datasheet Download