What is the primary use of a circuit breaker?

The primary use of a circuit breaker is to prevent overloads and short circuits. Circuit breakers are critical safety devices designed to interrupt the flow of electricity in an electrical circuit when they detect a fault condition, such as an overload, which is when the current exceeds the rated capacity of the circuit, or a short circuit, where current flows along an unintended path.

By stopping the current flow in these situations, a circuit breaker helps to prevent overheating of wires, potential fires, and damage to electrical equipment. This protective feature ensures that the electrical system operates safely and efficiently, reducing the risk of hazardous conditions. The other options do not accurately represent the fundamental purpose of a circuit breaker. For example, while enhancing power distribution or increasing current flow may be desirable in certain systems, these actions could lead to overload situations if not properly managed, which is precisely what circuit breakers are designed to guard against. Similarly, boosting voltage levels is undertaken using transformers or similar devices, not circuit breakers.