What safety feature is activated when a circuit breaker pops?

When a circuit breaker pops, it serves as a safety feature designed to protect the electrical system from overload or short circuits. The primary function of a circuit breaker is to disconnect current flow once it detects a fault condition. This interruption prevents excessive current from damaging components or causing potential hazards, such as fires. By stopping the flow of electricity, the circuit breaker ensures that safety is maintained within the system.

The other options do not accurately describe the primary function of a circuit breaker. While disconnecting current flow is at the core of the breaker’s function, features like isolation of the battery bus or activation of backup systems may involve separate mechanisms or systems that are not directly related to the immediate action taken by the circuit breaker itself. Furthermore, the power supply to the voltage regulator may be affected by the breaker, but the breaker’s main role is to manage current flow to ensure overall safety and stability of the electrical system.