Ground-fault circuit interrupters are designed to trip at current levels above:

Ground-fault circuit interrupters (GFCIs) are specifically designed to protect people from electric shock by detecting ground faults, which occur when there is an unintended path for the electric current to flow to the ground. GFCIs are calibrated to detect very low levels of current leakage, as even a small amount of current can be dangerous.

The correct level at which GFCIs typically trip is 6 mA. This trip level is set to provide sufficient protection, as it aims to prevent serious injury or fatality from electric shock. When a current leakage exceeding this threshold occurs, the GFCI interrupts the flow of electricity very quickly—usually within milliseconds—to protect the user.

Other options, such as 10 mA or higher currents like 4 A and 20 A, are not the standard thresholds for GFCI devices and would not provide the necessary protection against potentially lethal shock risks. The trip level of 6 mA is a critical aspect of GFCI operation, ensuring a balance between nuisance tripping and safety.