Electrical issues

[satz]

When i plugin my travel trailer the gcfi in the post trips. Used the same for over 8 yrs . Even though its a 15 AMPS it always worked.
after playing abit of tag, i narrowed it down to two circuit breakers tripping. The battery was not charging. so the converter
First one said conv, so brought a new converter and popped it in.

Now one circuit breaker is tripping not the one that is labeled conv.

Can some one help me identify the this label. 20 AMPS
its the in below AC "MlC" or "M/L"

 

[Crazydog]

It's probably MIC for microwave

 

[Buly]

Sometimes breakers go bad.

 

[Kevin D Pem]

GFICs go bad! However they also indicate power going to ground, a possible dangerous condition! Try a new GFIC first.