Which device is primarily used to resume service after interruptions due to faults?

The automatic line recloser is specifically designed to monitor electrical faults and can automatically restore service once an interruption occurs. This device detects temporary faults, such as those caused by tree branches or birds, and attempts to close the circuit after a brief pause. If the fault is still present after the recloser cycles, it will remain open to protect the system, thus reducing equipment damage and enhancing reliability.

In contrast, a lightning arrester is used to protect the electrical system from voltage spikes due to lightning strikes, and it does not play a role in service restoration. A voltage regulator helps maintain stable voltage levels across the line, ensuring consistent power delivery but does not directly intervene after a fault. A circuit breaker, while capable of interrupting current flow to prevent damage from faults, typically requires manual resetting or does not offer the automatic reclosure capability that an automatic line recloser does. Thus, the automatic line recloser is the most effective device for resuming service after interruptions caused by transient faults.