Determining whether an electrical fuse is blown involves performing a continuity test with a digital multimeter or conducting a visual inspection. First, unplug the appliance or trip the circuit breaker to ensure complete electrical safety. Second, extract the fuse from its holder. For glass fuses, look for a broken internal filament or dark discoloration; for ceramic fuses, visual checks are impossible. You can troubleshoot electrical safety easily. You can verify that your fuse is blown when setting your digital multimeter to the ohms or continuity setting registers an open circuit (OL) with zero continuity, confirming the internal metal wire has melted open.
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