Which device is a reusable safety switch that breaks the circuit when the current becomes too high?

Which device is a reusable safety switch that breaks the circuit when the current becomes too high?

• A. Circuit breaker
• B. Fuse
• C. Neutral wire
• D. Ground wire

Answer: (A)

Devices that protect circuits by interrupting current when it gets too high are circuit breakers. A circuit breaker detects overloads or short circuits and opens the path so the current stops. It’s reusable because it trips and can be reset after the fault is fixed. A fuse also protects circuits, but it works by melting a metal link when overheating; once it blows, you must replace it, so it’s not reusable. Neutral wires provide the return path for current, and ground wires offer a safety path to earth; neither one automatically interrupts current to protect the circuit.

Devices that protect circuits by interrupting current when it gets too high are circuit breakers. A circuit breaker detects overloads or short circuits and opens the path so the current stops. It’s reusable because it trips and can be reset after the fault is fixed. A fuse also protects circuits, but it works by melting a metal link when overheating; once it blows, you must replace it, so it’s not reusable. Neutral wires provide the return path for current, and ground wires offer a safety path to earth; neither one automatically interrupts current to protect the circuit.