Back in 2012, SOLIDWORKS introduced SOLIDWORKS Electrical, which contains 2D schematic design capabilities. SOLIDWORKS also introduced SOLIDWORKS Electrical 3D, which allows easy integration of your 2D electrical schematic with your 3D solid model. It includes the ability to solid model electrical components as well as perform wire/cable/harness routing. Your 2D schematics and 3D design are bidirectionally synchronized and automatically updated. SOLIDWORKS Electrical Professional is a combination of capabilities into one convenient package.
This combination of historic 2D electrical schematics along with 3D solid modeling is a revolutionary step in electro-mechanical design. An interesting publication authored by a member of the SOLIDWORKS team highlights some of the interesting moments in electrical design history. Read more about it here.