What is the primary use of a circuit breaker?

The primary use of a circuit breaker is to prevent electrical overload, which is crucial in maintaining safety in electrical systems. A circuit breaker acts as a safety device that automatically interrupts the flow of electricity when it detects a fault condition, such as an overload or a short circuit. This interruption helps to protect electrical circuits and devices from damage that can occur due to excessive current flow.

By breaking the circuit when an overload occurs, circuit breakers safeguard not only the electrical infrastructure but also help to prevent potential fire hazards and electrical shocks. Properly functioning circuit breakers are essential for ensuring the safety and reliability of electrical systems in residential, commercial, and industrial settings.

While other devices serve different functions, such as amplifying current, converting AC to DC, or measuring resistance, their roles do not pertain to the core safety function provided by circuit breakers to prevent electrical overload.