This part is a kind of semiconductor called 1N3005.
Function of this product has (1N3000 - 1N3015) 10W Zener Diodes.
Manufacturers : America Semiconductor
Image and pinout :

Some of the text within the PDF file :
Free Datasheet http://www.net/ Free Datasheet http://www.net/ [ ... ]
1N3005 PDF Datasheet Download
