Indexed as a schematic, the 75.3 KB PDF titled 30TPS appears to be a family datasheet for a series of power semiconductors sharing that prefix, rather than a circuit diagram for a device. It is likely related to the 30TPS16 document in this set, possibly covering several voltage grades in one sheet. Technicians use such a reference to pick the right grade, verify pin functions and read thermal limits. Check the full code on the part, including voltage digits, against the table inside before ordering a replacement.
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.