May be Circuit Breakers are cheaper, they are definitly not better. What you are looking for is protection, and a Circuit Breaker takes more then one pass through natural cero to definitly interrupt a faulty circuit. On the contrary, HV-Current Limiting Fuses will interrupt before the fault current can get to its peak value In this way the circuit to be protected will not receive the full impact of the, may be short circuit. This is what I call protection, whilst a Circuit Breaker only provides interruption. So, for main incomming protection, I alway´s will recomend Current Limiting Fuses. Circuit Breakers or none Current Limiting Fuses do not provide protection, only interruption.
Have good day.
Roger.