Which two devices are the most widely used for overcurrent protection?

The most widely used devices for overcurrent protection are a circuit breaker and a fuse.

A circuit breaker is designed to automatically interrupt the electrical flow when it detects an overcurrent situation, such as a short circuit or an overload. This automatic disconnection helps prevent damage to electrical circuits and equipment. The ability to reset the circuit breaker after it has tripped adds convenience and reliability, making it a popular choice for modern electrical systems.

A fuse operates on a similar principle but functions differently. It contains a metal wire or strip that melts under excessive current, thereby breaking the circuit and stopping the flow of electricity. Although fuses must be replaced after they blow, they provide a reliable and time-tested means of protecting circuits.

Together, circuit breakers and fuses combine the benefits of automatic disconnection and simplicity of operation, making them the standard devices used for overcurrent protection across various electrical and refrigeration applications. Their prevalence in most installations emphasizes their effectiveness in maintaining safety and preventing potential damage from overcurrent conditions.