Home circuit breaker kicks with trailer connected

Do a search on this forum. There probably over 100 previous posts. If you don't find some really great stuff, Not saying the responders are not useful, then try IRV2.com and search the same thing.

It can get complicated or be as simple as an overly sensitive GFI. If you are using an extension cord then all bets are off. Do a search on how a GFI works and you may get some ideas.

Converter attempting to start and run at full power because your battery(s) are significantly discharged would be my guess. Especially if you are using a 12guage (or lighter) and long (>10') extension cord

Whats the amp rating on the trailer vs. the amp rating on the circuit your trying to plug into?
Are you using a cheater electric plug?

Well, absolutely everything is turned off in the trailer. The home circuit is a gfi breaker, I just push the button to reset. I don't think it's the home breaker, I run my compressor, power washer etc off this circuit. The shore power cable does have some cracks in it next to the metal prongs. It could be the shore cable as suggested. I tried turning off the trailer main ac breaker, and no home breaker kicked off. But it did kick off the home breaker as soon as I turned on the trailer main breaker. Unless there's any other suggestions, it looks like a new cable to me. Thanks a bunch.

I'm guessing it shouldn't be too hard to pin point where the AC current is going to be coming from.

My first thing would be to throw the main trailer circuit breaker to OFF before hooking up which means about the only thing you would in the mix would be your surge protector or possibly the 120VAC transfer contactor if you have an on-board generator setup..

Not much else would be in the loop other than bad shore power cable and or connectors..

If things come on up normal doing this then you can have all of the 120VAC Circuits in the OFF position and start with the main breaker first then turn ON each of sub breakers on until one trips your house breaker.

You would think an overload on the trailer side would always trip the trailer breaker first but that sometimes is not always what happens. It could be your house breaker for the trailer circuit is going weak as well tripping with a smaller load then it should.

On the trailer side the on-board converter can offer a pretty good load to the main breaker if you catch it in the boast charge mode when initially plugging into the house. Hot water heaters and other large current units can also play
games with you...

You just have start bringing thing up one at a time until you find the problem

Roy Ken

Are you sure nothing is on? How about your electric water heater? What else is already on this same circuit in your house?
Does this circuit breaker have a little white or yellow button on it indicating it is a GFCI breaker? If so then you may have a ground fault in the trailer you need to find instead of an overload or short.
I would first try plugging into a different outlet, particularly one that is on a different circuit, to see if the problem goes away.

Have you made sure that everything in the RV is turned off before plugging in? I had a coffee maker causing ours to kick off before. I've also had a problem with the actual RV plug itself having a loose connection which caused high resistance and popped the breaker.

I am not an electrician but you may want to try a different extension cord if you are using one. I had one that would trip my breakers. Recently I had a box outside that when I plugged in, the breaker would pop. Turned out the outlet was in bad shape. I am sure it was 40 years old. Once I switched it out for a new outlet, it worked great.