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Originally Posted by CarWiz
As a side note. I strongly suggest you use Solid State Relays (SSR) instead of contactors. Depending on the controller you use, the contactors will wear out in a hurry. SSRs will switch on 3-32vdc and will handle 240vac/30A+. SSRs can be switched directly from the SSR output on a controller. SSRs can also reduce light flicker in the shop since they switch on the zero boundary of an AC cycle. They don't shock the circuit like a contactor.
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or you can be like me and over kill it. i'm using an industrial 100 amp mercury contactor