During a fault on a feeder, which device opens and then recloses the line?

• A. The recloser will open, momentarily deenergizing the line, and then close
• B. The sectionalizer will immediately reroute power
• C. The feeder will be permanently shut down
• D. A transformer will re-energize the line

Answer: (A)

When a fault occurs on a feeder, protective reclosing is used. A recloser interrupts the circuit to clear the fault and then automatically attempts to reenergize the line after a short interval. If the fault is temporary, power returns; if the fault persists, the recloser may trip again and stay opened to protect equipment. This behavior—opening to clear the fault and then reclosing to restore service—is exactly what the device does. A sectionalizer does not perform automatic reclosing; it works with upstream protection to isolate a faulted section and does not itself reclose the line. A feeder isn’t permanently shut down by design, and a transformer isn’t responsible for reclosing the line.