The role of the fuse in the low-voltage power distribution system is to ensure safety and protect both the power grid and electrical equipment. It is a widely utilized device to safeguard against short circuits and overloads. In the event of such incidents, the fuse automatically interrupts the circuit, preventing damage to the electrical equipment and halting the spread of potential accidents.
A fuse comprises of several components, including an insulating base, a contact, and a melt. The melt serves as the functional core of the fuse, acting like a specialized wire connected in series within the circuit. In the event of a short circuit or an overload where the current becomes excessive, the melt is designed to melt from overheating, effectively cutting off the circuit. Melts are often crafted in the form of filaments, grids, or flakes. These melts possess specific characteristics such as a relatively low melting point, stability, and ease of fusion. Typically, metals like lead-tin alloys, silver-plated copper sheets, zinc, and silver are employed for this purpose. However, the melting and interruption of the circuit also generate an arc. To ensure safe and efficient arc extinction, the melt is generally positioned inside the fuse enclosure, accompanied by measures that swiftly extinguish the arc.
Low-voltage systems utilize fuses extensively due to their simplistic design, easy handling, and affordable cost. These advantageous features have made fuses highly popular among users.