I scrap old industrial equipment when I can lots of good valuable parts. This was something I scrapped 15 years ago.
I have about 20 more that I can not find, I think they are SCS or SCR, they have 3/4" lugs, high amp cable and 2 small wire. I have 2 sizes, cant remember if they are 5/8 and 3/4 or 3/4 and 7/8 lugs.