Lynnmor wrote:
With a 30 amp breaker protecting the outlet and a 30 amp breaker in the trailer, it would be impossible to overload the plug.
There was a high resistance connection that caused the heat, plain and simple.
Funny thing is a 30 amp plug is only rated for 24 amp continuous load.
The breaker is also limited but it's variable exactly when it will pop if you are hovering right around the limit. An old weak breaker might pop at 27amps. A new breaker might do 32amps for a couple of minutes before popping (I would have to look up the specs but they do allow for a range).
Higher resistance does play into it but at 2amps just running the fridge, the resistance isn't going to create much heat or do any damage. At 28amps, the breaker might not pop but that same resistance, you get a lot more heat.
Keep in mind, you will also get variability depending on the ambient temperature as that will affect the amperage before it trips (colder will generally allow more amperage)