TS-30 Wiring Diagram
The TS-30 switches between two AC sources and only two sources. If three sources are on the RV, then two switches would be required.
Here are some examples of different ways to wire a TS-30 transfer switch.
#1 TS-#30 Switching between Shore power and generator
#2 TS-30 Between Inverter and Shore Power
TS-30 with inverter, shore and generator requiring two Transfer switches