How much current can cause an automatic shut off in a breaker used in wet locations?

An automatic shut-off in a breaker used in wet locations is typically set to activate at low current levels to enhance safety and prevent electrical shock hazards. The correct answer of 5 mA is significant because it represents the threshold at which the device can detect potential leakage currents that may be dangerous in wet environments.

Wet locations pose increased risks for electrical shock because water can serve as a conductor, increasing the potential for current to flow through unintended paths, such as a person's body. A threshold of 5 mA is deemed sufficient to protect individuals from severe electric shocks. This is aligned with safety regulations and standards aimed at minimizing the risk of injury in environments where moisture is present.

Higher current values, such as those provided in the other choices, increase the likelihood of injury before the breaker would trip, undermining the safety purpose of these devices in wet locations. Therefore, the correct answer represents a precautionary measure designed to ensure maximum safety for users in potentially hazardous conditions.