Determining whether an electrical fuse in your home service panel or inside an appliance like a microwave has blown involves performing a visual inspection and a continuity test with a digital multimeter. For glass fuses, look for a broken internal metal filament or a cloudy dark discoloration on the glass wall. For ceramic cartridge fuses, visual checks are impossible, so you must test them with a multimeter set to ohms. You can troubleshoot electrical faults safely by isolating power first. You can verify that your fuse is blown when a multimeter registers an open circuit (OL) with zero continuity, confirming that electrical current cannot pass through and the fuse must be replaced.
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