work of modern enterprises, as, indeed, and the lives of ordinary citizens, can not do without electricity.At the same time, it should be understood that the electrical current, despite its indispensability, is a very real danger.That is why the issue of protection from exposure emerged almost simultaneously with the first electrical appliances.One of the main elements of this protection are the fuses.
Fuse is a special unit, whose main function is to disconnect the mains.Disabling it is because that due to the impact of the current parameters of which exceed the maximum allowable, parts fuse blows and the circuit is broken.Fuses are arranged in such a way that the open circuit occurs due to the fact that melted fuse that fails because of the extremely high rate of current.
fuse has been a relief for electric circuits, where the rates of current and voltage can instantly increase several times.These devices feature simple, low cost, compact size and high breaking capacity.This high-voltage fuses are made for cases when the supply voltage reaches a performance of more than 35 kilovolts, while lower settings are made of low voltage fuses.
fact that in the past century fuses become almost indispensable element of life, led to a marked diversity of their modifications.At the same time it is worth noting that the main elements included in the scope of these instruments, are practically unchanged.The same high-voltage fuses consist of a body of the connecting device, fuse and arc protection.
According to the basic rules of the state standard, fuses carry their service in two main modes: normal fuses rates give all formed therein heat into the environment, and in the case of overload or short-circuit fuses rates should in a short time burn, thereby forming a gap in an electrical circuit.It should be remembered that the higher the temperature, the fuses should work more quickly.
Usually insert a special disc with cut-outs, which are necessary in order to reduce its cross-section at selected sites.It is here that fuses isolated greatest amount of heat, so if you short-circuit the heating going on here as quickly as possible.In this case, the heat to the extended portions has no time to reach, so the insertion start to melt, which consequently leads to their melting.The main result of all these processes is that the paste loses its ability to conduct an electric current, and the circuit is broken.
Thus, fuses play a huge role in modern electrical circuits.Their safety depends on the proper functioning of the whole area and, consequently, the lives of ordinary citizens.
