What is the primary function of an overcurrent protective device in a circuit?

The primary function of an overcurrent protective device, such as a fuse or circuit breaker, is to prevent fire hazards in electrical circuits. These devices are designed to detect excess current flowing through the circuit, which could indicate a fault condition, such as a short circuit or overload. If the current exceeds a certain threshold, the device interrupts the flow of electricity, thereby protecting the wiring and connected devices from overheating and potential ignition sources that could lead to fires.

While other options mention functions that might seem relevant (like regulating voltage or enhancing performance), they do not align with the specific purpose of overcurrent protective devices, which is fundamentally focused on safety by preventing dangerous conditions that could lead to fires. Ensuring the accessibility of a circuit is also not within the scope of these devices; their main role is electrical safety.