I haven't ordered contactors yet. I appreciate your (and other's) help. Continued input is welcome. . .. Another option I have is to use high-current SSRs, which are inexpensive (about 40 dollars, in lieu of hundreds of dollars for contactors). The problem is that SSRs generate 1.5 Watts per ampere, and I need (qty 2) per converter. Basically I'll be dumping 600 watts into a heatsink when the lathe/converter are running. On the plus side, there's no moving parts with SSRs. I don't want to go the SSR route, but I don't want to spend 1.5 grand on contactors either. Used or old non-used surplus might be my best route. I'm going to order the parts I know I need - starter caps, run caps, supply breakers, etc. I still need to build a frame for the motors, and pull a permit for the second 200 amp panel in the shop - thus I've got a little time to continue shopping for contactors. . . .