This part is a kind of semiconductor called VLT60-3000.

Function of this product has 60W single and triple output AC/DC Power Supplies.

Manufacturers : Rocket

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Some of the text within the PDF file :

VLT60 Series 60W single and triple output AC/DC Power Supplies The world’s top selling 60-watt convection cooled multi-output power supply. The EOS VLT60 family of power supplies is just 2”x4”x1” in size and the industry leader in density and power conversion efficiency. Packing nearly 8 watts per cubic inch the VLT60 is an industry top seller with multiple outputs, superb efficiency---converting AC/DC at >85%---and a full 60 watts out put power with convection cooling. The EOS brand VLT60 family is the power supply of choice for discerning engineers across the datanetworking, industrial and multimedia industries. An optional cover kit is available. The VLT60 is ideal for 1U (1.75”) height and smaller applications where space is a premium and excellent thermal management is key. [ ... ]

VLT60-3000 PDF Datasheet Download