What action occurs when a fault is detected in a fused cutout switch?

When a fault is detected in a fused cutout switch, the correct response is that the fuse burns and opens the circuit. This action is a protective measure designed to prevent equipment damage and maintain safety within the electrical grid. Fused cutout switches are specifically engineered to isolate faults by automatically disconnecting the circuit when an overload or short circuit occurs.

The operation involves the fuse element melting due to the excess current flowing through it, which interrupts the circuit. This is crucial because it helps to prevent further damage to the system and ensures that dangerous conditions do not propagate through the network. The opening of the circuit alleviates the immediate risk by stopping the flow of electricity where it is no longer safe or functional.