Replacement fuses are available from hardware stores, home centers and electrical supply outlets. Bringing the blown fuse to the store with you allows the merchant to easily find the exact replacement fuse you require.
There are two main types of fuses: plug and cartridge fuses. Plug fuses are more common, and they protect circuits used by less-demanding electrical appliances. Cartridge fuses are not as common, and these heavy-duty fuses protect dedicated circuits for appliances such as ovens, water heaters, furnaces and refrigerators.
Plug fuses have a metal screw on one end and a plastic or glass window on the opposite end. The metal end screws into the plug socket on the electrical panel. The glass or plastic window shows whether the fuse is working or blown. Plug fuses are available in regular and tamper-proof variants and at capacities between 15 and 40 amperes.
Cartridge fuses resemble large versions of disposable batteries. They are usually cylinders with a metal cap on either end. Most cartridge fuses have opaque cases and require individual testing when checking for failures. Cartridge fuses have much higher capacities than plug fuses, with fuses available at up to 600 amps.
Both types of fuses are available with a time delay. The time delay prevents fuses from blowing unnecessarily during regular surges in power, such as a refrigerator or water heater periodically cycling its motor.