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You can find the info you are looking for in the 'service & support' menu at the top of this page. I run a Dynasty 300 off of 220 and a 50 amp breaker. Mind you, I don't use the machine above 200 amps, but the required breaker for the machine provides 65 amps at 60% duty cycle, using 250 amps welding current. If you have 100 amp service to your shop, than you should have nothing to worry about with the recommened breaker.