Current production residential/light commercial breaker lines are available in multiple interrupting capacity ratings -- this rating is how much current the breaker can safely interrupt without blowing itself to bits from the effects of the arc inside. For instance, the Siemens breakers come in 10kA, 22kA, and 65kA, while Eaton BRs come in 10kA, 22kA, and 42kA with a few available in 65kA as well.
This is useful in commercial work, where larger services and feeders can deliver higher fault currents than the 10kA typically standard for residential and light commercial services. However, would installing more robust (i.e. higher interrupting rating) breakers deliver an advantage in longevity even if a 10kA breaker could handle the maximum prospective fault currents available from the service? Or should I simply get 10kAIC branch breakers as the higher ratings are more cost without any benefit if you don't need them?