What device is commonly used to break or interrupt the flow of electricity to prevent circuit overloads?

The device that is commonly used to break or interrupt the flow of electricity to prevent circuit overloads is a circuit breaker. Circuit breakers are designed to automatically cut off the flow of electrical current when an overload or short circuit is detected. This action protects the electrical system and connected devices from damage that can be caused by excess current.

When the current exceeds a predetermined level, the circuit breaker reacts to stop the flow, which can prevent overheating, electrical fires, and equipment failure. They serve not just as a switch but as a safety feature, ensuring that the electrical system remains safe under various conditions.

In contrast, a transformer is used to change the voltage level in an electrical system, and while it plays a crucial role in power distribution, it does not interrupt current flow. A capacitor stores electrical energy temporarily and is used in various applications but does not provide protection against overloads. A surge protector also serves a protective purpose, but it specifically guards against voltage spikes rather than interrupting current flow during overload situations.