Would you be referring to the switch that toggles you between the FIRE-PLACE or the WATER-HEATER (on electric mode} I believe the reason shore power 30amp only allows the use of one of those appliances at a time. We always use water heater on propane, and have access to the fireplace if need be, plus water-heater on propane has a way faster recovery time. The switch on our trailer is just an ordinary house switch like you would have in your home. I also use a permanent marker to make future reference and life a little easier for down the road, as I know darn well by spring I won't remember half of what I learnt this year about the camper, Stickers fall off, mine won't anymore.
2011 ST25RB SunSet Trail - RESERVE
Silverado LT Z71