This part is a kind of semiconductor called SDR-240.

Function of this product has 240W Single Output Industrial DIN RAIL.

Manufacturers : Mean Well

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Some of the text within the PDF file :

240W Single Output Industrial DIN RAIL with PFC Function Features : SDR-240 series High efficiency 94% and low power dissipation 150% peak load capability Built-in active PFC function, PF>0.93 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 3 years warranty SE PQ M IF GL Marine 47 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.) VOLTAGE RANGE FREQ [ ... ]

SDR-240 PDF Datasheet Download