Fuses protect against overcurrent (too much current flow), however caused.
It is a circuit fuse in a vehicle. The fuse is used to protect the courtesy/clock circuit.
horn gap fuse is a protective device which use to protect the equipment from higher voltage.actually horn fuse or horn gap fuse is a thin wire element as compare to load line when a high current drawn in line the wire is melt and line protect.
If a fuse in your home keeps blowing it can be caused by several things. Most often it is because that circuit is being overloaded. There is simply too many things pulling power on that circuit. It can also be caused by a short in the wiring somewhere. Can also be an appliance is defective. Can also be someone has installed a fuse that is too small for the circuit. Whatever you do, do not install a larger fuse than the circuit calls for to prevent it from blowing. The fuse is there to protect the wiring from overheating and catching on fire.
An aM fuse is usually an industrial fuse with an operating characteristic designed to protect inductive loads e.g. motors. Using a general purpose 'gG' fuse in such an application could lead to nuisance operation because the fuse cannot withstand the initial start-up surge.
Because if it is not connected to both it is not a full circuit and therefore if it is not a full circuit then the fuse can't protect you.