Which type of GFCI provides protection by means of a standalone device?

The portable type of GFCI (Ground Fault Circuit Interrupter) provides protection through a standalone device that can be easily moved from one location to another. This type is particularly beneficial in settings where a temporary electrical supply is needed, such as outdoor work sites or when using electrical equipment in wet conditions. The portable GFCI can plug directly into a standard outlet and offers protection to anything plugged into it, detecting ground faults and disconnecting power within milliseconds to prevent electrical shock.

In contrast, the circuit breaker type is integrated into the electrical panel and protects an entire circuit rather than functioning as a standalone device. The immobile type, which may refer to GFCI outlets permanently installed in walls, also does not qualify as a standalone device since it is part of the building's electrical system. Although there are various types of GFCIs available, it is the portable type that stands out for its mobility and ease of use in diverse locations.