Determining whether your AC fuse is blown requires a safe visual inspection and continuity test. Step 1: Turn off the power supply at your main electrical breaker panel to ensure safety from electric shock. Step 2: Remove the cartridge fuses from your outdoor disconnect box. Step 3: Visually inspect the internal filament window; if the metal strip inside is melted, charred, or broken into 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 on a multimeter, whereas a blown fuse will show no reading.
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