Which statement about circuit breakers is true?

Which statement about circuit breakers is true?

• A. They melt a fuse element when overloaded.
• B. They trip and cannot be reset.
• C. They protect only a single circuit.
• D. They reset after tripping and can protect multiple circuits.

Answer: (D)

Circuit breakers are protective devices that open the circuit when overloads or faults occur, and they can be reset after the fault is cleared. That resettable nature is what distinguishes breakers from fuses, which must be replaced after they melt. In many setups, a single breaker (a main or feeder) can supply and protect multiple downstream circuits, so one breaker can interrupt power to several branches if something goes wrong. This is why the statement that breakers reset after tripping and can protect multiple circuits is true. The idea that they melt a fuse element is a fuse characteristic, not a breaker one; and breakers don’t typically trip and become non-resettable. Also, while a breaker can be dedicated to a single circuit, it’s not limited to that use, as a main or feeder breaker serves multiple circuits.

Circuit breakers are protective devices that open the circuit when overloads or faults occur, and they can be reset after the fault is cleared. That resettable nature is what distinguishes breakers from fuses, which must be replaced after they melt. In many setups, a single breaker (a main or feeder) can supply and protect multiple downstream circuits, so one breaker can interrupt power to several branches if something goes wrong. This is why the statement that breakers reset after tripping and can protect multiple circuits is true. The idea that they melt a fuse element is a fuse characteristic, not a breaker one; and breakers don’t typically trip and become non-resettable. Also, while a breaker can be dedicated to a single circuit, it’s not limited to that use, as a main or feeder breaker serves multiple circuits.