What is the main advantage of using a circuit breaker instead of a fuse in an electrical circuit?

• A. A circuit breaker can be reset and reused after tripping, while a fuse must be replaced once it blows.
• B. A circuit breaker is always less expensive than a fuse.
• C. A circuit breaker does not protect against short circuits, while a fuse does.
• D. A circuit breaker allows more current to flow than a fuse of the same rating.

Answer: (A)

Verified step by step guidance

1. Understand the purpose of both devices: both fuses and circuit breakers are safety devices designed to protect electrical circuits from damage caused by excessive current.
2. Recall that a fuse contains a metal wire that melts when the current exceeds a certain limit, breaking the circuit and stopping the flow of electricity.
3. Recognize that once a fuse has melted (or 'blown'), it must be physically replaced to restore the circuit's functionality.
4. Know that a circuit breaker is an electromechanical switch that trips to open the circuit when excessive current is detected, but it can be reset manually or automatically without needing replacement.
5. Conclude that the main advantage of a circuit breaker over a fuse is its ability to be reset and reused after tripping, making it more convenient and cost-effective in the long run.