I agree with J.Powell. As a canadian electrician I have not used these “kit” systems. In the mining industry, for example, we design/build our own “racks” with a splitter/junction box to accept the supply feed(s) then distribute power to local disconnects and starters. We use certain manufacturers’ equipment that we are satisfied with which in turn maintains continuity and simplicity in our inventory and re-ordering system. Mixing up the same style of equipment from different manufacturers with different catalogue numbers only complicates our affairs…Perhaps you may be better off designing your own setup with gear of your choice.