Here you can download 3D models in STEP format or as a PDF file.
For 3D viewing of a PDF file you can use for example Acrobat Reader DC from Adobe. For this purpose, 3D content must be activated in the Reader program:
Menu Edit - > Preferences - > 3D & Multimedia - > Set the checkbox "Enable playing 3D content"
Air-cooled DC Loads
Energy Recycling DC Load