i have two welders and one plasma cutter all 220 volt @ 50 amps. I would like to run a cable to a welding table and have a way to switch power to three different outlets on the table. Only one unit powered at any time. Can some tell what switch use?
If you are trying to connect switches to three different outlets the easiest method I can think of is mount a sub panel closest to the receptacles and connect each receptacle to a different 50A breaker. I think trying to find and purchase a heavy duty 240V/50A 3 position switch would probably be a little out of a DIY price range, as it is an industrial piece of equipment.
Hope this helps
FYI - From a commercial standpoint you can connect 50A receptacles together on a single circuit. I have done but the AHJ made us label each receptacle that only one receptacle could be used at one time.
What you want is called a "3 step cam switch", they are available up to about 200A as far as I know, 63A is a very common size available all over the world.
One of the biggest mfrs, their products are sold under several other big names, but they are the actual mfr. http://www.krausnaimer.us/Countries/USA/en/Control_Switches/control_switches.html