Which device is designed to prevent overcurrent in electrical systems?

The device designed specifically to prevent overcurrent in electrical systems is the circuit breaker or fuse. Both of these devices serve the critical function of protecting electrical circuits from excess current that can lead to overheating, potential equipment damage, or fire hazards.

A circuit breaker automatically interrupts the flow of current when it detects an overload condition, allowing for easy reset after the issue has been resolved. Similarly, a fuse contains a thin piece of metal designed to melt and break the circuit when the current exceeds a specified threshold, thus stopping the overcurrent flow.

Understanding this protective function is essential for ensuring safety in electrical systems, as well as maintaining system integrity by preventing damage to other components that could arise from excessive current conditions.