The best page to search for CAD files (2D and 3D of different formats) is https://www.traceparts.com
Free registration is needed and after that the CAD files download is possible.
Direct link to Schneider gearboxes is:
https://www.traceparts.com/en/search/traceparts-classification-mechanical-components-power-transmission-angular-gears-gearboxes-planetary-gearboxes?CatalogPath=TRACEPARTS%3ATP01005004004
Feel free to use filter on left side to select the types suitable for you motor, diameter, ration, etc. Picture as an example.

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