The Todd has 2 contactors/relays with mechanical interlocks, once either shore or generator power is hot the other input cannot be engaged, there was one in my Safari DP, i always thought of it as a quality product, I make it a point to switch off high draw loads like the A/C before switching between shore generator or inverter, i will run the MW from inverter but not the A/C
I recently replaced my Failed addon ats which was a Southwire 30amp RV ats, when it failed i replaced it with this one from Amazon
2 pole 120v 63amp
While not advertised for RVs, there is no enclosure box, I'm very happy with it ,
Yes there is a 240v model available ,
Main power input is default aux power input is for generator or inverter , main power is dominate and will overide and automatically switch back when shore
power returns ( if the Manual - Automatic Rocker is set to Automatic.), it is motor driven and break before make the two input sources never come in contact,
It also has Manual Mode Operation, there is Rocker switch to choose automatic or manual mode, put the rocker on manual and turn the big Blue Handle to the power option you want, great if shore power is being intermittent during or after a storm, set to manual switched to aux input using inverter it will stay there and not switch back and forth because of shore power blips ,