What is the primary function of ground-fault circuit interrupters?

Ground-fault circuit interrupters (GFCIs) are specifically designed to protect individuals from electrical shock by quickly disconnecting power when a ground fault is detected. A ground fault occurs when electricity travels through an unintended path, such as through water or a person, creating a situation where there is a risk of electrocution. GFCIs continuously monitor the current flowing through the circuit and, if they detect an imbalance (indicating a leak of current), they cut off the electricity within milliseconds. This rapid response significantly reduces the risk of serious injury or fatality, making shock protection their primary and most crucial function.

While other options may pertain to electrical systems (like preventing fires from overloads or controlling circuit distribution), they do not directly relate to the specific role of GFCIs in safeguarding human life from electrical hazards.