English-language datasheet in PDF form, about 841 KB, titled DC datasheet B1en. The name does not identify the component, manufacturer or product, so open it to find the part number in the header. Datasheets give pinout, electrical ratings, operating conditions, package outlines and typical application circuits, which a technician uses to verify a part, check supply voltages on a board or select a replacement. Make sure the full part number and suffix on the component match the document before relying on the figures.
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 @datasheets1. 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.