Ya don't want to use a really big switch, you have to have the zig zag chromalox strip to control the inrush current and cut the voltage down to ~8 volts.
If you want a really good relay get the one pictured below, it's a Stancor 586-902 GP 200 amp Relay, the large one, small one is OEM controller relay, can't find what it's rated at. It will have to be mounted differently. You can google it for the specs. Last I knew, they are $60 online.
You shouldn't have to use a circuit breaker or fuse, the fusible links are for that. But if you rewire it, eliminating the links, then a slo-blow 150 amp fuse should be used.
Initial current draw is 196 amps for about 2 seconds then reduces to 135 for the duration of the GP cycle.