Named 240NQ without any suffix, this 44.6 KB PDF probably describes a family of power rectifiers sharing that prefix rather than one specific grade. It is listed under schematics but contains component data, not a board diagram. Use it to look up ratings, package drawings and mounting information when servicing power supplies or other high current equipment. Any PDF viewer opens it. Since the suffix normally sets the voltage grade, read the full marking on the device before choosing values.
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.