Which device is often used to interrupt a circuit in case of overload?

A circuit breaker is the device designed specifically to interrupt a circuit in the event of an overload. It functions as an automatic switch that detects excess current flowing through the circuit and automatically shuts off the electrical flow to prevent damage to the circuit, appliances, or wiring. This is crucial for maintaining safety in electrical systems, as it helps avoid overheating and potential fires caused by overcurrent conditions.

Transformers, relays, and capacitors, while important components in electrical systems, serve distinct purposes. A transformer is primarily used to change voltage levels in an electrical circuit, making it essential for power transmission and distribution. A relay acts as an electrically operated switch that allows a low-power signal to control a larger power circuit but does not inherently protect against overload. A capacitor is used to store electrical energy temporarily and perform functions like filtering, coupling, and smoothing in circuits, but it does not interrupt circuits due to overload conditions.