I use Autocad Electrical now, and it has built in components that can schematically represent about anything. When I installed, I installed the libraries for A/B stuff as well as about a dozen other mfgs.
But, in a previous life, I used Autocad Lite, and built a boatload of my own symbols. They're not perfect, and most of them just use fixed text rather than editable attributes. They were all built for the drawing system of my previous employer, and I have modified some of them over the years, until I started using ACADE about a year ago.
I could share those with you if you'd like when I am not too busy at work...
Let us know what version of AutoCad you're using and what specific modules you need.