What is the primary function of circuit breakers in electrical systems?

The primary function of circuit breakers in electrical systems is to manipulate high values of current and voltage safely and effectively. Circuit breakers are designed to interrupt the flow of electricity when there is a fault or abnormal condition, such as an overload or short circuit. This interruption prevents potential damage to electrical circuits, equipment, or even fires that may result from excessive current or faulty conditions.

In doing so, circuit breakers perform a crucial protective role in electrical systems. They enable the safe disconnection of circuits, automatically targeting those high levels of current without requiring manual intervention, which enhances the reliability of the electrical system. Their ability to handle high voltage and current capacities is essential for maintaining system integrity and safety.

The other options involve functions or components that are not primarily associated with circuit breakers. For instance, visual confirmation of de-energization is typically provided by indicators or locks rather than the circuit breaker itself. Similarly, the connection of conductors is usually the role of terminal blocks or junction boxes, while transformers are specifically designed to change voltage levels, rather than functioning as circuit protection devices.