Foremost, circuit breakers can quickly be reset, enabling the circuit to be restored with minimum downtime. In addition, there is no assurance that a replacement fuse will be the proper rating. If a fuse is replaced by a higher rated fuse, overheating and catastrophic equipment failure may occur. Circuit breaker performance is relatively stable over time, but as fuses age, their trip characteristics change. This may lead to nuisance tripping and increased downtime.