What is a common application of a circuit breaker?

A circuit breaker is primarily designed to interrupt the electrical flow in case of an overload or a fault condition, making the option highlighting this function the correct choice. Its main purpose is to provide an automatic switch that stops the current from flowing when it detects an overload, which helps prevent overheating, potential fires, and damage to electrical devices. This seamless operation of disconnecting the circuit ensures the safety of both the electrical system and the users.

While some devices might measure voltage, provide surge protection, or filter signals, these are not the primary functions of a circuit breaker. Measuring voltage is typically the role of multimeters or voltmeters, surge protection is managed by surge protectors or dedicated devices, and filtering signals is associated with capacitors or dedicated filtering equipment in electronic circuits.