Which device protects an electrical circuit by interrupting the flow of current?

The device that protects an electrical circuit by interrupting the flow of current is a circuit breaker. A circuit breaker works by automatically shutting off the electrical flow when it detects an overload or a short circuit in the circuit. This interruption helps prevent damage to electrical components, reduces the risk of fire, and enhances safety by stopping the current before it can cause harm.

In contrast, a resistor is used to reduce current flow and can dissipate electrical energy as heat but does not provide protection against overcurrents or faults. A transformer is designed to change the voltage level in an electrical system, but it does not interrupt current. An inductor stores energy in a magnetic field when current passes through it and, similar to a resistor, does not function to interrupt current flow when faults occur.