"Basically, SSFs are political committees established and administered by corporations, labor unions, membership organizations or trade associations. These committees can only solicit contributions from individuals associated with connected or sponsoring organization. By contrast, nonconnected committees—as their name suggests—are not sponsored by or connected to any of the aforementioned entities and are free to solicit contributions from the general public. For additional information, consult our Separate Segregated Funds and Nonconnected Committees fact sheet."
The examples that comes to mind...that (SSFs)labor unions use funds raised from 'union dues' and corporations use 'profits' to support political candidates, while FR would be soliciting from the general public, which would fall under being a nonconnected committee.
For additional information, consult our Separate Segregated Funds and Nonconnected Committees fact sheet."
That can be found here.
"SSFs and Nonconnected PACs"