PTC Self-resettable fuses provide self-restoring overcurrent protection, while SMD fuses provide single-acting fusing protection.If a short circuit occurs, some applications requires physical disconnection in the circuit without requiring a circuit reset and continued operation.In this case, SMD fuses can be used.PTC Self-resettable fuses can be used in applications where the circuit is to be protected from overcurrent events and then continue to operate after the events has passed and after a power cycle.