Automatically senses hot wire-to-ground faults in a 4 to 6 milli-ampere range, and shuts off the power. Applications include bathrooms, cellar outlets, swimming pools, outdoor branch circuits, garage and carport areas, and kitchen branch circuits within 6 ft of the sink. Requires one 1-inch space. Wire size range #14 - 4. Fits Bryant, Westinghouse and Challenge. Type BR. 6.25 in x 3.75 in x 1.25 in UL Listed, Meets UL 489. 120 volt AC, 10,000 AIC.