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A blown fuse in a power supply typically indicates that too much current is being drawn from the circuit. Fuses are designed as protective devices that interrupt the flow of electricity when the current exceeds a certain threshold, preventing damage to the electrical components and minimizing the risk of fire hazards. When a device or circuit demands more current than the fuse can handle, it will blow, thereby breaking the circuit and ceasing the flow of electricity.

This scenario directly relates to the fundamental purpose of a fuse, which is to safeguard electrical systems from overload. When current draw exceeds the rated capacity, the fuse's metallic strip melts, opening the circuit and stopping the flow of electricity. Therefore, when a fuse blows, it serves as a crucial indicator that something within the system is causing excessive current draw, necessitating investigation and resolution to restore proper operation.