Identify the function of a reclosure.

• A. Will open and close when a fault is sensed
• B. Added to system to improve power factor
• C. Protects substation and sub-transformer from overloads
• D. Time-over current is the type used in the Company system

Answer: (A)

A reclosure automatically opens the circuit when it detects fault current and then closes again after a short delay to see if the fault has cleared. If the fault is temporary, service is restored quickly without a manual outage; if the fault persists, the reclose sequence repeats and may lock out to isolate the fault. This behavior—opening on fault and then re-energizing automatically—is what makes a reclosure useful for improving reliability on feeders by clearing transient faults automatically. The other statements describe functions that aren’t what a recloser does: power-factor correction devices, substation overload protection, or a timing-based overcurrent scheme, none of which capture the automatic open-and-close restoration role.