Which device is used to stop electrical current in case of an overload?

The circuit breaker is designed specifically to interrupt the electrical current flow in the event of an overload. It acts as a safety mechanism that automatically disconnects the electrical circuit when it detects a surge of current that exceeds safe levels. This prevents potential hazards such as overheating, electrical fires, and damage to equipment.

While a fuse can also serve a similar purpose by blowing and interrupting the current, circuit breakers are generally more convenient as they can be reset without needing to be replaced. The transformer is utilized to change the voltage level in an electrical circuit, and a regulator is used to maintain a steady voltage level, neither of which is responsible for stopping electrical current during an overload. Thus, the circuit breaker stands out as the correct choice for managing electrical overload conditions.