The main job of the fuse is to protect the wiring. Fuses should be sized and located to protect the wire they are connected to. If a device like your car radio suddenly draws enough current to blow the fuse, the radio is probably already toast. The fuse is there to protect the wire, which would be much harder to replace than the radio.
Most cars have two fuse panels. The one in the engine compartment holds the fuses for devices like the cooling fans, the anti-lock brake pump and the engine control unit — all of which are located in the engine compartment. Another fuse panel, usually located in the dashboard near the driver’s knees, holds fuses for the devices and switches located in the passenger compartment.
The type and construction of fuses varies from car to car.
A rectangular blade type. This is the most common type. It has two push-in connectors linked by a visible fuse wire.
A clear-glass type. A wire running through breaks when overloaded.
The continental type. A shaped metal strip set in one side melts under excessive load.
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