Visio shapes and symbols (US and metric units) for you to create drawings of domestic and industrial electrical installations, lighting plans, wiring plans, power generation and distribution, process control and fire and security systems. All the shapes have connection points at suitable locations. Use the standard Visio connector tool to join the shapes. Some shapes have a right-click menu e.g. many of the switches symbols have a menu to select open or closed contacts (and the switch moves - you can use this to animate the switches). All shapes have custom properties for manufacturer's data, part numbers etc. so that you can create BOM (bill of materials), parts lists and inventories using the standard Visio report tools. You can use the transformer kit shapes to create your own transformers by combining and grouping the kit parts to suit your own requirements. You can also add appropriate winding symbols to indicate winding phases. The stencil "automotive devices" is included in both the electrical and the electronics stencil sets. Here is a larger scale illustration of all the shapes in the electrical stencils. If these are not the shapes you want then maybe you want Electronics shapes.
to join the shapes. Some shapes have a right-click menu e.g. many of the switches symbols have a menu to select open or closed contacts (and the switch moves - you can use this to animate the switches).