What type of device provides overcurrent protection in electrical systems?

The device that provides overcurrent protection in electrical systems is a circuit breaker. Circuit breakers are designed to automatically interrupt the flow of electricity in the event of an overload or short circuit, which can help prevent electrical fires and damage to equipment. When the current exceeds a certain threshold, the circuit breaker trips, breaking the circuit and stopping the flow of electricity. This action not only protects the wiring and devices connected to the circuit but also ensures safety by minimizing the risk of overheating or fire.

Transformers are used to change the voltage level in electrical systems but do not provide overcurrent protection. Resistors are used to limit current flow or divide voltages, and while they can impact circuit behavior, they do not serve as protective devices against overcurrent. Diodes are used to allow current to flow in one direction only and protect against reverse polarity but do not provide overcurrent protection. Thus, the primary role of a circuit breaker as an overcurrent protection device is critical for maintaining safe electrical system operations.