What is the role of a fuse in an electrical system?

The role of a fuse in an electrical system is to protect against overcurrent by breaking the circuit. A fuse is designed to melt and interrupt the flow of electricity when the current exceeds a certain level, which prevents damage to the electrical components and reduces the risk of fire. This safety device serves a critical function in safeguarding both the electrical system and connected appliances, ensuring that if an overload occurs, the circuit is broken, thus stopping the excessive current from causing harm.

In electrical systems, maintaining a safe and manageable current flow is essential, and fuses are a reliable way to achieve this. Unlike other devices that may regulate voltage or provide power supply, fuses specifically focus on overcurrent situations. Therefore, the correct answer highlights the fuse's vital role in protecting the entire electrical circuit from potential failures or hazards resulting from excessive current.