Which statement correctly describes a circuit breaker?

Which statement correctly describes a circuit breaker?

• A. They interrupt the circuit. Can be used multiple times, reliable and tamper proof
• B. They store energy and release slowly
• C. They convert AC to DC
• D. They pass current with no resistance

Answer: (A)

At its core, a circuit breaker provides overcurrent protection by interrupting the circuit whenever current exceeds a safe level. It’s designed to be reset after it trips, so it can be used again, and it’s built to be reliable and tamper resistant in aviation applications. The other descriptions describe different devices or ideas: storing energy and releasing it relates to energy-storage components like capacitors; converting AC to DC is what a rectifier does; and passing current with no resistance would be an ideal conductor, which isn’t what a breaker is or does. So the statement that best describes a circuit breaker is that it interrupts the circuit and can be reused after tripping.

At its core, a circuit breaker provides overcurrent protection by interrupting the circuit whenever current exceeds a safe level. It’s designed to be reset after it trips, so it can be used again, and it’s built to be reliable and tamper resistant in aviation applications. The other descriptions describe different devices or ideas: storing energy and releasing it relates to energy-storage components like capacitors; converting AC to DC is what a rectifier does; and passing current with no resistance would be an ideal conductor, which isn’t what a breaker is or does. So the statement that best describes a circuit breaker is that it interrupts the circuit and can be reused after tripping.