What device must be attached to electronic equipment in an enclosure to prevent electrocution?

The Ground Fault Circuit Interrupter (GFCI) is specifically designed to protect against electrical shock and prevent electrocution. It does this by monitoring the amount of current flowing through a circuit and detecting any imbalances that may occur. If the GFCI senses that the current is flowing along an unintended path, such as through a person who may be touching a live part, it swiftly cuts off the power to the circuit. This quick response significantly reduces the risk of severe injury or death caused by electric shock.

In the context of electronic equipment housed within an enclosure, the GFCI ensures that accidental contact with live electrical components does not lead to fatal consequences.

The other options serve different purposes: a fuse box protects against overloads and short circuits, a surge protector primarily guards against voltage spikes, and a power switch simply controls the flow of electricity to the device without offering any protective features against electrical shock. Thus, the unique protective function of the GFCI makes it the essential device for preventing electrocution in this scenario.