Datasheet for the 1N5408, the 1000 V top grade of the 1N5400 series of 3 A general-purpose silicon rectifiers, stored as a 43.4 KB PDF under schematics. Vendor and revision are not named. The sheet covers repetitive reverse voltage, forward current, surge rating and the axial package. Such rectifiers are typical in mains bridges and power supply inputs. Because the 1N5408 tops the range, it can usually replace lower grades of the same current, but confirm the package fits the footprint.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @cyberlanelectonik. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.