Whether Dometic or Norcold brand, both units utilize a 120vac heating element for the boiler on your refrig. It's not uncommon, with age, to have that heating element(s) fail in some manner which causes it to short, and of course, pop the breaker it's connected to. So that you can continue using your refrigerator on propane, open the outside cover to your refrig, look for either 1 or two 120vac standard plugs, if your unit has an icemaker there will be two 120vac plugs, and only 1 if you do not, but for now, just unplug them. Reset the 120vac breaker inside and set the refrig to auto or LP again and it will continue to run on propane. Have the unit serviced and mention to the tech that it's tripping the 120vac breaker to the refrig.. they'll know what to do next :-) Enjoy the rest of your camping outing!
94-Newmar Kountry Star 40-KSDP
Spartan/Cummins 8.3C-300HP/Allison 3060 WTEC-II/25yr RV Tech RVIA Certified/Onan-Cummins Certified