Part reference for the 3N250, stored as a PDF of about 43.6 KB and catalogued in the schematic section. The name gives only the JEDEC number; the 3N prefix denotes a registered device with four leads. With the same size as 3N246 through 3N252, it most likely reproduces one family datasheet listing several grades. It helps when confirming lead functions and ratings during repair or replacement. Open it in a PDF reader and match the grade on the physical component to the right table row.
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.