Which type of circuit typically includes a circuit breaker to enhance safety?

The inclusion of a circuit breaker is a crucial safety measure for protecting electrical systems from overloads and faults, and it is applicable to all types of circuits. A feeder circuit distributes electrical power from a substation or main panel to various service circuits, effectively carrying substantial loads. Consequently, circuit breakers are included to safeguard against excessive currents that can occur from short circuits.

Service circuits, which connect the main electrical supply to various parts of a facility or home, also rely on circuit breakers for protection. They ensure that any potentially dangerous overcurrents can trip the circuit before causing damage or posing a fire risk.

Branch circuits, which are the final circuits responsible for delivering electricity to outlets and devices within a building, are similarly protected by circuit breakers. This ensures that each section of the electrical system is safeguarded individually.

Thus, since circuit breakers are integral for enhancing safety across all these circuit types, the correct answer encompasses all of them as they each significantly benefit from the protective features a circuit breaker provides.