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PLUG-IN FUSE

Description: This consists of a housing with a threaded end, the linkage inside, and a tiny glass window through which you can see if the fuse has blown; that is, if the linkage has melted because of an overload (too much current) or a short circuit, which amounts to the same thing. These fuses actually screw in like a light bulb.

Buying information: Plug-in fuses can be bought singly or in small packages, but dealers will commonly open a package to sell you one. Fuses are sized by the amperage, or current they can take; they come in 5-amp increments ranging from 5 to 30 amps. Fifteen amps is normally used for the lighting circuits in the house. Large appliances such as air conditioners use 20-, 25-, and 30-amp fuses. In each circuit, the wires are designed to handle just so much amperage. If the wires are carrying too much amperage, the fuse blows. Never use a fuse of higher rating than originally intended for the circuit or the protection will be lost.

How-to hints: When changing a fuse, make sure the floor you're standing on is dry. In case of errant electricity, you won't be grounded and in danger of getting a serious shock.

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