Give one property that a fuse wire should have

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Give one property that a fuse wire should have

Last updated at May 29, by Teachoo. A fuse is a piece of wire of a material with a very low melting point, that is, it melts and breaks as soon as its temperature gets higher than its melting point. The material used for making fuse have low melting points , hence fuse wires are mainly made up of tin, lead or zinc. A fuse is used in a circuit to avoid overloading or short circuiting. When a current higher than the rating of the fuse flows through it, the fuse wire gets heated and melts. This breaks the circuit and protects the appliances from getting damaged. An ideal fuse must have the following properties. The appliances which work on large current have fuse of higher current ratings. The appliances which work on small current have fuse of smaller current ratings. Learn in your speed, with individual attention - Teachoo Maths 1-on-1 Class. CA Maninder Singh is a Chartered Accountant for the past 13 years and a teacher from the past 17 years. Your browser does not support the audio element. Maths Classes.

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The material used for fuse elements must be of low melting point, low ohmic loss, high conductivity or low resistivity , low cost and free from detraction. The material used for making fuse element has a low melting point such as tin, lead, or zinc. A low melting point is, however, available with a high specific resistance metal shown in the table below. The material mainly used for fuse element are tin, lead, silver, copper, zinc, aluminum, and an alloy of lead and tin. An alloy of lead and tin is used for small current rating fuses. For current exceeding 15A this alloy is not used as the diameters of the wire will be larger and after fusing the metal released will be excessive. Beyond 15A rating circuit, copper wire fuses are employed. Copper wire suffers from the drawbacks that it operates at a rather high temperature if a reasonably low fusing factor is desired. There is thus a tendency for the wire to overheat with the result that its cross-sectional area and fusing current are gradually reduced, and premature melting of the wire may occur.

Give one property that a fuse wire should have

Normally, the ampacity rating of a conductor is a circuit design limit never to be intentionally exceeded, but there is an application where ampacity exceedence is expected: in the case of fuses. A fuse is nothing more than a short length of wire designed to melt and separate in the event of excessive current. Fuses are always connected in series with the component s to be protected from overcurrent, so that when the fuse blows opens it will open the entire circuit and stop current through the component s. A fuse connected in one branch of a parallel circuit, of course, would not affect current through any of the other branches. Normally, the thin piece of fuse wire is contained within a safety sheath to minimize hazards of arc blast if the wire burns open with violent force, as can happen in the case of severe overcurrents. In the case of small automotive fuses, the sheath is transparent so that the fusible element can be visually inspected. Residential wiring used to commonly employ screw-in fuses with glass bodies and a thin, narrow metal foil strip in the middle.

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To understand the working principle behind an electrical fuse, two critical concepts should be kept in mind.

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