Small 33.8 KB PDF on the 2sk2495, a part number in the JIS N-channel FET series marked by the 2SK prefix. The name provides nothing else, such as maker, package or revision. Short sheets like this usually contain pin identification, key limits and a case drawing. Use it to determine which lead is which before measuring, to verify voltage and current capability, and to judge whether a substitute is suitable. Check that the marking on the original matches this number.
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.