Fuses
Fuses perform the same function as a breaker, except when a fuse blows, it has to be replaced.
There are cartridge fuses and screw-in fuses. Cartridges look kind of like a shotgun shell. They mount in a little rack that pulls in and out of a bracket
Screw-in fuses screw in and out like light bulbs. Some have a glass window on top and metal threads on bottom.
When a fuse blows, its in...
Fuses perform the same function as a breaker, except when a fuse blows, it has to be replaced.
There are cartridge fuses and screw-in fuses. Cartridges look kind of like a shotgun shell. They mount in a little rack that pulls in and out of a bracket
Screw-in fuses screw in and out like light bulbs. Some have a glass window on top and metal threads on bottom.
When a fuse blows, its in...
ternal metal strip breaks and the window may get discolored. Be sure to replace a fuse with the exact same amperage-rated fuse.
Fifteen and 20 amp fuses are the most common size ratings. Some fuses have a smaller screw base and are called "non-tamperable, type-S" fuses.
The threads vary in size so they can't be accidentally replaced by another type. When you install a fuse, screw it in snug, then give an extra 1/4-turn to make a solid connection.
Other fuses are rated as "slow-blow" or "time delay." They take a little longer to blow and are made to withstand short, extra surges of power -- like a motor starting.
When buying replacements, be sure to get the right fuse types. It's also a good idea to get a couple extra fuses of each type to keep on hand when working on circuits.
Fifteen and 20 amp fuses are the most common size ratings. Some fuses have a smaller screw base and are called "non-tamperable, type-S" fuses.
The threads vary in size so they can't be accidentally replaced by another type. When you install a fuse, screw it in snug, then give an extra 1/4-turn to make a solid connection.
Other fuses are rated as "slow-blow" or "time delay." They take a little longer to blow and are made to withstand short, extra surges of power -- like a motor starting.
When buying replacements, be sure to get the right fuse types. It's also a good idea to get a couple extra fuses of each type to keep on hand when working on circuits.
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