In an electrical system, what is the term for a device that interrupts the current flow in case of an overload?

In an electrical system, a breaker is specifically designed to interrupt the current flow in the event of an overload or a short circuit. When the electrical load exceeds a certain threshold, causing excessive current to flow, the breaker automatically trips, cutting off the electricity supply to prevent potential damage to the circuit or electrical devices. This automatic response enhances safety by minimizing the risk of overheating and electrical fires.

The relevance of a breaker lies in its resettable nature; once the issue causing the overload is resolved, a breaker can be easily reset without the need for replacement. This functionality contrasts with a fuse, which must be replaced after it blows. While both serve to protect circuits, the breaker’s ability to reset makes it a common choice in modern electrical systems.

Devices like switches are intended to control the flow of electricity manually, while relays typically serve to control different circuits using a low-power signal. Neither of these components functions directly to interrupt current flow due to overload conditions.