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In a recent video. I watched I saw a DIN rail transfer switch. Also turns up when you search for "changeover switch". Never knew these existed. For those of us in North America, if you get a 4 pole switch, you can switch leg 1, leg2, ground bond the neutral or not and have one pole left over to indicate to your inverter that you are on utility grid or generator. https://a.co/d/0iIT9VEb