N2 Electrical Trade Theory|The Easy Way! 99 Advantages


HRC fuses have the following advantages over rewirable fuses: • Te fusing element does not deteriorate. • Te fuse rating is more accurate. • Te indicator makes it easy to see when the fuse has blown. • It can interrupt high short-circuit currents. • Teir operation is silent.


6.8.3 Edison screw fuse


Te Edison screw fuse is a cartridge type fuse which has its rating clearly indicated on it. A glass window makes it possible to see whether the fuse has blown. Tese fuses are most oſten used in stoves.


If the fuse blows on a relatively small overcurrent, the narrow part of the fuse melts. In the event of a large overcurrent or short-circuit, the whole of the element will be blown away.


6.8.4 Rating of a fuse A fuse has two current ratings, namely, an overcurrent and a short-circuit rating.


Te overcurrent rating refers to the maximum current that the fuse will allow to flow before operating (blowing).


Te short-circuit rating is the maximum current that the fuse is capable of interrupting. For example, if the second rating of the fuse is 5 kA, it means that it should not be used in a circuit where the short-circuit current is likely to exceed 5 000 amperes.


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