Role of fuses and their parameters

In electricity the fuse is used to protect the appliance during over current. The fuse is generally a low resistance device which is used as sacrificial device. Often it is a metal wire or some strip which melts when current overflows.  The use of fuse interrupts the power flow thus preventing the all electrical appliances connected with the flow of current. During the wiring of house or home, maximum fuse current ratings are marked to know the maximum current that can flow through them without disturbing the current flow. The blowing of a fuse prevents the damage to property and appliances.

The current operating characteristics are selected to provide the protection without any needless power interruption. Slow fuse are used to get the harmless short term currents flow over their ratings but prevents the large over flow. The self resetting fuses automatically come back to the original position after the overload current flow is cleared. These fuses are used in those circuits, where it is no possible for a human being to replace or reset the fuse. Fuses are made with varied range of voltages and current ratings for various electrical circuits and requirements.

Each fuse has a current rating denoting the maximum current that can flow through it without interrupting the flow of current to circuits. The speed at which a fuse blows depend the current flowing Chemical Earthing Material Manufacturers  through it and material of the fuse. The fuse which blows at the slight increase in current is used in household circuits. Most of the fuses in homes are of this nature. the time delay fuse are the fuse , which allow the current above their current rating to flow through them for certain period of time without blowing . These types of fuses are used in motors, where large current is needed before coming to normal speed.

Breaking capacity is the maximum current that is safety cut by the fuse. Often this is higher than the short circuit current. Small fuses have breaking capacity only 10 times their current rating. Some fuses filled with sand or similar material has high interrupting capacity.

Rated voltage of the fuse must be greater than or equal to the open circuit voltage. When the fuses are used in series, there is no increase in the rated voltage .The voltage of fuse also remains same, without any increase in the voltage. The I2t value or rating is the amount of energy that is let through by fuse when it clears the electrical fault. It is normally in short circuit conditions that this term is used.

Fuses area made in Chemical Earthing Material Manufacturers various sizes and shapes for wide use in home and outside the households. Generally, the fuses are made from ceramic, plastic, glass and fiberglass .It can also come in molded mica laminates or compressed molded fire.  Fuses are also made with different enclosures to stop interchange of different ratings of fuses.