PDF document of 246 KB tied to the 1N4001 rectifier, catalogued under schematics. The plus sign in the name is uninformative and does not identify a vendor or revision, so check the contents to see which manufacturer and family members are included. The 1N4001 is the 50 V, 1 A device in the 1N400x line. Repair technicians use such sheets for forward voltage, reverse leakage, surge capability and DO-41 dimensions when replacing failed rectifiers in supplies, chargers and polarity protection circuits.
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.