Which sectionalizing device is specifically designed to protect the fuse from temporary faults?

The correct choice is the oil circuit recloser, as it is specifically engineered to protect distribution systems, including fuses, from temporary faults that can occur due to transient conditions. An oil circuit recloser can detect overcurrent situations caused by short circuits or other disturbances and automatically disconnects the circuit. After a predetermined time, it attempts to reclose the circuit, allowing normal operation if the fault has cleared. This automatic operation is particularly useful for handling temporary faults, as it minimizes unnecessary outages and limits wear on fuses. If the fault persists, the recloser will then remain open, allowing for necessary maintenance or repairs, thus protecting the fuse from damage due to prolonged overcurrent.

In contrast, a main circuit breaker serves as an overall protection device for a large section of the electrical system but does not have the same capability for automatic reclosure in response to temporary faults. A transformer is primarily responsible for voltage regulation and does not directly protect fuses or respond to faults. A disconnect switch is a manual device used to isolate sections of the circuit for maintenance and does not provide automatic fault protection or respond to transient fault conditions.