Which statement about circuit breakers is true?

• A. They can only interrupt fault current during fault conditions
• B. They never interrupt current
• C. They can interrupt current flow through a distribution line
• D. They require continuous manual operation

Answer: (C)

Circuit breakers are protective switching devices that interrupt current to protect equipment and people when something goes wrong. They’re built to open the circuit quickly not only during faults but also to isolate parts of the system for maintenance or switching operations. That means they can interrupt current flow along a distribution line, stopping the current to protect the line and connected equipment and creating safe gaps for maintenance or fault isolation. They don’t only interrupt fault current, and they don’t require continuous manual operation—many breakers trip automatically or can be opened remotely or manually when needed. This is why the statement about interrupting current flow through a distribution line is the true one.