It does work the same way. It automatically comes on at 50 amp or 30 amp which ever your plugged into. If you want 20 amp you can manually drop it down to that too. It has four items it "sheds" if you exceed the power supply. You would be able to wire them to whatever you wanted. Mine is set to shed the block heater first, then the water heater, then rear A/C, and finally the front A/C. Then they automatically come back on when the power permits. I hope your an electrician because it does look involved to add on. Good Luck!
Wayne H. & Nixie Miller
2006 Newmar Dutch Star 4027