Why a Breaker Trips
There are a few reasons why a breaker will trip, but essentially, breakers trip when the current exceeds the amps your system can handle, i.e. your electrical system is overloaded.
Circuit breakers come in different amp ratings, so some systems can handle more than others. If you live in an older home or apartment that has few outlets, your system may have a lower amp rating, which will make breakers trip more easily.
Most important, when a breaker trips, it is keeping your electrical system from a literal meltdown, which can cause a fire.