Which file should I choose?
Socomec-ATyS-Transfer-Switch-93532010-2D-CAD-Block.zip is the original NHP Electrical Engineering Products archive. Open 93532010.pdf inside it to read the original sheet, including its annotations and any marked dimensions.
Socomec-ATyS-Transfer-Switch-93532010-STEP-CAD-Block.zip is the original NHP Electrical Engineering Products archive. Open 93532010.stp inside it to place the original solid geometry in your 3D assembly.
