I need to switch something at 600-800 amps I think a high current SCR would be ideal for my needs but they are expensive even on ebay. I was wondering about other switching options.
Is your load resistive or inductive?
If it's inductive you might need to use a classic electromechanical contactor for your task, but switching speed would be quite low.
i am currently using a mechanical switch to switch 200V at 300-400amps and it sometimes fuses the switch and i would like something faster thanx for the site