Fuse adapters are used with Type S fuses. This is an older type of fuse and is actually a two-part mechanism. The adapter screws into the socket in the main panel and the fuse screws into the adapter. Each adapter has a unique thread pattern that only allows fuses of the proper amperage to fit into it. Thus, you cannot screw a 20-amp fuse into a 15-amp adapter. This is an important safety feature. Adapter-type fuse boxes are older technology. To safely remove an adapter, you will need a special tool that is available at some electrical specialty houses and at most Home Depots.
Things You'll Need
Fuse Adapter Tool
Put on rubber gloves, rubber boots and lay down a rubber mat before beginning to work on the fuse panel.
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Cut off the power to the fuse panel. Most systems have a main shut-off switch. In some older units, you might have to disconnect power cables going into the fuse panel. If it is the latter, make sure to have some plastic electrical caps to put over the connection wires so you do not have live wires exposed while you are working.
Screw the fuse out of the adapter you wish to replace. Use the adapter removal tool to screw the adapter out of the socket. If you're removing a broken adapter, make sure to get all the pieces out of the socket in the panel.
Replace the old adapter with an adapter of the same amperage rating.
If several of your adapters are damaged, you should consider replacing the panel with one that uses more up-to-date technology, such as circuit breakers and time-delay fuses. Modern conveniences such as air conditioners create temporary power surges that will blow out type S and standard fuses. Time-delay fuses and circuit breakers will accommodate such temporary power surges without requiring you to routinely replace fuses.
Only replace adapters if they are damaged. Always use the same amperage rating in replacement adapters. Replacing a 15-amp adapter with a 20-amp adapter can create a fire hazard in your home. If a fuse is constantly blowing out, you need to determine if there is a short or if you are overloading that particular circuit.