Name a common type of protection device used to detect overcurrent.

A circuit breaker is a common type of protection device used specifically to detect overcurrent conditions in electrical systems. When the current flowing through the circuit exceeds a predetermined level, typically due to overloads or short circuits, the circuit breaker automatically interrupts the flow of electricity. This action helps to prevent damage to the electrical system and reduce the risk of fire or equipment failure.

Circuit breakers are designed to be easily reset after they trip, allowing for a convenient way to restore power once the issue has been resolved. They can also provide additional features such as adjustable trip settings and integrated ground fault protection, making them versatile choices for many applications.

While fuses also serve the purpose of protecting against overcurrent by melting and breaking the circuit, they require replacement after an overcurrent event, making them less convenient compared to circuit breakers. Transformers, on the other hand, are used for voltage regulation and do not directly detect overcurrent, and relays are often used in conjunction with protection devices but do not independently act as overcurrent detectors.