Best to isolate one of them, the battery charger would be my first guess. Often there is a 'kettle' type plug powering it that can be fairly easily removed.
Dave.
------------- Give a man a fish and he will eat for a day,
Teach a man to fish and you can get rid of him for a whole weekend.
Sorry its a swift challenger 2000 it's is the red wire live plug on the back of the unit that cause it to trip there are 3 feeds off that plug and I've disconnected all 3 and it still trips the mcb that says fridge/battery charger
As previously asked what is the Battery state. If totally dead after standing a long time this can cause the charger to trip as it is acting as a dead short. If so replace the leisure Battery. But if the charger and fridge are totally disconnected suggests there is a faulty MCB or a fault in the consumer unit.
------------- 2023 Swift Archway Woodford, MK3 Kuga ST Line X 190 ps AWD Auto
Now 52 years Caravanning completed.
A flat battery shouldn't cause an MCB to trip.
If everything everything is disconnected and unplugged then it is possible that there is a fault on the wiring.
saxo1