Only the code 47CTQ020 identifies this 129 KB PDF, filed as a schematic without any brand, model or board number. The code resembles a discrete power semiconductor part number from the same naming family as the 48CTQ files, at a different voltage grade, so expect a datasheet. It provides ratings, characteristic graphs and a package drawing for checking a suspect part or choosing an equivalent. Confirm the full code on the physical component before using the figures inside.
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.