What device is designed to interrupt the flow of electricity to prevent electric shock?

The ground fault circuit interrupter (GFCI) is specifically designed to enhance safety by interrupting the flow of electricity when it detects a fault, such as an unintended path to ground. This device monitors the electrical current flowing through a circuit and can quickly cut off power if it senses an imbalance, which may occur when electricity is flowing through a person who is in contact with an electrical source. The GFCI is crucial in preventing electric shocks, particularly in wet areas like bathrooms, kitchens, or outdoor locations where the risk of water contact is increased.

While other devices like the residual current device (RCD), circuit breaker, and fuse also serve functions related to electrical safety, they are not solely dedicated to preventing electric shock in the same manner as a GFCI. The RCD performs similar functions to a GFCI and is often used interchangeably in some contexts, but the specific design and application may vary regionally. Circuit breakers and fuses primarily protect circuits from overloads and short circuits rather than directly preventing electric shock from ground faults. Therefore, the GFCI stands out as the most effective device for interrupting electricity flow specifically to enhance personal safety against electric shock.