What michael describes is the current limiting function of your afci breaker. It also detects arc faults which can cause fires while staying under the mag trip limit. These are separate functions.

I doubt the 22ka and 10ka ratings will make much difference to your problem. You've probably either got a pos breaker or a noisy dimmer or an actual arc fault.

The first thing to do is to replace your afci (and having an afci (as well as a gfci) is a good idea) with a Square-D brand breaker. These are the best and will not nuisance trip. I've found that Eaton and GE (both common in houses because they be cheap) do nuisance trip.

Once you have the SqD breaker in place, and if it still trips, it may be an electrically noisy light dimmer (they tend to look like arcs to the afci anyway), or you may have a loose connection, corroded switch, or some other actual arc fault to track down.

And definitely get someone to do this for you. On a house load center, even with the main breaker off, there will still be power available to kill you.