Determining whether an electrical fuse is blown involves visual inspection and continuity testing. Step 1: Turn off the power supply to the appliance or disconnect box to ensure complete safety from electric shock. Step 2: Remove the cartridge fuse or plug fuse from its holder. Step 3: Visually inspect the internal glass or mesh filament; if the metal wire inside is melted, charred, or broken into two separate pieces, the fuse is blown. Step 4: Use a digital multimeter set to continuity mode to test across both terminals. Verification: A healthy fuse will show zero resistance or beep on a multimeter, whereas a blown fuse will show no reading.
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