When a GFCI outlet senses an overload or surge in electricity, it will instantly trip, triggering the breaker to cut off the electrical current to minimize the risk of electrocution. For safety ...

See? Good and evil. An RCD (or GFCI in the States) is a kind of circuit breaker that trips when the amount of current in the hot and neutral mains power lines aren’t equal and opposite ...

allows GFCI receptacles to protect “normal” ones (the roundish everyday outlets you have throughout your home) on the same circuit, and special circuit breakers can also provide GFCI protection.