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Fuse Fuses are widely used nowadays as protection devices. They are utilized in various circuits, electrical equipment and installations. . Fuse serve to protect them against overcupepts and short-circuits. There are different types of fuses in use nowadays. Of them, quartz sand blows, serve for, except for up to 500 volts; fuse of this kind are pro duced with surrent ratings of 15 to 60 amp and of 100 to 350 amp. Fuses are commonly used in low voltage industrial installations rated up to 1.000 u. Fuse protection is based op and very simple principle: in case of a short circuit or oversurrent, when the maximum value of surrent has been exceeded, the fusible link of a fuse is heated to its melting point. This opens the circuit and disconnects the circuit from the power source. In case of a fault, one should replace the faulty fusible element ′U and the new one. Fuses are used both in direct surrept (d.c.) and alternating current (a.s.) circuits.
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