20 amp breaker just started tripping

[soconor]

Montana 3811ms. 20 amp breaker-Samsung fridge, microwave and appears to be the non gfi outlets. (Tv, bedroom, kitchen. On gfi). Had air fryer and coffee maker on and tripped breaker 2 weeks ago. Reset and had no other issues, not verloading it. Last night it tripped for no reason and this morning it was tripped again. Not tripped in the 1/2 cocked position, but flat out off. I turned off and reset. Waiting to see if it’s off again when wife gets up.

[wiredgeorge]

Do you have the power converter connected to the electrical supply through an EMS? If not, can't say the power you are connected to isn't the problem. If you are using an EMS, then, if I understand, a 20A breaker popped. You say a different (the GFCI breaker) popped awhile back. Could be the breakers themselves are overheating. I installed a fan in my power converter to avoid this happening. Also, switched circuits around so the ones in continuous use were not next to the ones used occasionally.

[rhagfo]

Well an air fryer and coffee maker are a good size load, check the wattage on both, would bet both are over or very near 1,000 watts. Do you know the brand of the breaker? Going all the way to off is not common.

[Steveo57]

You can always swap the breaker with another one and see what happens.

[JRTJH]

Circuit breakers do "fail" or "wear out" and it's not always at the "way in the future" time frame, but sometimes a new breaker can fail....

That said, if you have an EMS, what was the voltage input to the trailer when this occurred? Remember that amperage goes up as voltage goes down (to keep the same watts flowing to the appliance) so if your input voltage is 125 VAC and your running a 1500 watt appliance, your amperage draw is 12 amps, that same 1500 watt appliance operated at 110 VAC will draw 13.6 amps and at 100 VAC will draw 15 amps. It could be "low input voltage" or it could be a bad breaker or even a bad appliance (although that's unlikely)....

[5J's]

All good advice. I'd swap a couple of breakers to see if the issue remains or follows the breaker.