Air Conditioner pops 20A breaker

[LadyWindrider]

Watch the digital meter closely, and this is one rare instance where digital is not better. If you have a momentary voltage sag, as when the ac kicks in, the digital may not respond fast enough to show just how bad it is. This is where an analog meter will shine, sorry, old school, sometimes. And yes, if you pulled more than 30 amps, the breaker on the campground supply should trip, assuming it is good, and accurate, and ...... Hope you get the picture. (the contacts may be welded close, who knows?). Good luck. Next step is to put an AC ammeter on the compressor line and see how much current is required at start up. Then you have to find a spec, but it should be less than 20 amps, because that's what the breaker is rated at, and probably all the wiring is rated for. (By the way, my opinion only, the dealer should have checked the current draw on compressor start up before he put the delay in. Would have verified compressor operation at least).Good Luck.

[Herk7769]

Do you have another 20 Amp breaker in your breaker box?

Again with NO power on the trailer, temporarily disconnect the AC hot wire and connect it to the other 20 Amp breaker. Most likely its the microwave or something that won't be missed while you are checking.

It could be a weak breaker and replacing it would fix your issue. The more often they are opened and closed the weaker they get.

ALSO CHECK THE WIRE AT THE BREAKER while you are in there. My house room AC at home was tripping the breaker and when I was in the breaker wiring adding a circuit I noticed the wire to the AC was burnt and the insuslation was partly melted .

The wire was not tight in the breaker's jaws and it was arcing there and causing heat that tripped the breaker (Thank Heaven). I had to replace the entire run to the AC.
That fixed my house AC problem.

[kev2504]

Well, Last weekend went without tripping the breaker. The voltage started at 119 volts and dropped down to 109.8 at the lowest, when the compressor kicked in. Then it went up to about 111.4 and held around there. I did fix the water heater, so that is running only on gas. I will keep close attention to this.
Thanks,
Kev