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A glass screw-in type fuse is designed to provide overcurrent protection in electrical circuits. When a fuse blows due to excessive current, it physically melts a thin wire inside the fuse element. This action creates an open circuit, effectively stopping the flow of electricity to prevent damage or fire hazards.

Unlike circuit breakers, which can be reset and reused after tripping, a glass screw-in fuse has a one-time-use nature. Once the internal element is melted and the fuse has blown, it cannot be reused or reset. Therefore, the fuse must be completely replaced with a new one to restore functionality to the circuit.

This fundamental characteristic of the glass fuse is crucial for ensuring safety in electrical systems. By requiring replacement rather than reset, it helps to ensure that any underlying issues causing the fuse to blow are addressed, preventing potential hazards from recurring. This clearly illustrates why this type of fuse cannot be reset, making the provided answer to the question accurate.