The placement of ___________ electrical switches in the power system makes it possible to limit both the duration and the extent of power outages.

• A. Automatic
• B. Manual
• C. Emergency
• D. Protective

Answer: (A)

Automatic switches are placed so that protection relays can rapidly isolate faults and reconfigure the network to keep service flowing to the healthy sections. When a fault occurs, these switches trip automatically and may even reclose after a brief transient, cutting out only the faulty section and restoring others quickly. This automatic action minimizes both how long customers are without power and how large the outage area becomes. Relying on manual switches would slow response—crews must travel to locations and operate switches, which prolongs outages and can let the fault affect a larger area. Emergency switches are meant for special situations and aren’t the standard means to limit routine outages. Protective devices provide the protection function, but it’s the automatic operation that actually contains the outage to a small area and restores service promptly.