What is the purpose of a breaker box?

• A. To convert AC to DC
• B. To monitor energy usage
• C. To store electrical energy
• D. To distribute circuits and protect them by interrupting current during faults

Answer: (D)

Breaker boxes are the central hub where incoming power is split into individual branch circuits and each circuit is protected from overcurrent. Each circuit connects to a breaker with a specific amp rating, and if the current rises above that rating due to a fault or overload, the breaker trips and interrupts the circuit. This automatic shutdown helps prevent overheating of wires and reduces the risk of fire. The panel may also include the main disconnect that can shut off power to all circuits. It's not used to convert AC to DC, store energy, or monitor energy usage. Its primary role is distribution and protection of the electrical system.