As others said, people are planning ahead that they may some day have an RV that is 50A and don't want to buy a new EMS. I had the 30A for our first coach and sold it to a buddy when we moved to 50A. The only real difference is the 30A is protecting only one hot line while the 50A is protecting two hot lines.
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2015 Legacy SR340 360RB
2014 Jeep Wrangler Unlimited Toad
Gigi, Poppy and Sadie Lady...On the road, but not full time!
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