Which device automatically interrupts current to prevent overload?

Which device automatically interrupts current to prevent overload?

• A. Fuse
• B. Circuit breaker box
• C. Conductor
• D. Switch

Answer: (B)

Automatically interrupting current to prevent overload is achieved by protective devices that trip and cut power when a circuit draws too much current. A circuit breaker inside a circuit breaker box does this by sensing the overload and automatically opening the circuit, and then it can be reset after the fault is cleared. This is more practical for ongoing use than a fuse, which also interrupts current but is single-use and must be replaced after it blows. A switch is manual and won’t automatically protect against overload, and a conductor by itself doesn’t interrupt current. So the circuit breaker box best fits the idea of automatic overload interruption.

Automatically interrupting current to prevent overload is achieved by protective devices that trip and cut power when a circuit draws too much current. A circuit breaker inside a circuit breaker box does this by sensing the overload and automatically opening the circuit, and then it can be reset after the fault is cleared. This is more practical for ongoing use than a fuse, which also interrupts current but is single-use and must be replaced after it blows. A switch is manual and won’t automatically protect against overload, and a conductor by itself doesn’t interrupt current. So the circuit breaker box best fits the idea of automatic overload interruption.