Plug-in fuse: It is commonly used at the end of the line at the voltage level of 380V and below, as a short-circuit maintenance for distribution branch lines or electrical equipment.
Spiral fuse: The upper end of the melt is covered with a fuse indicator, once the melt is blown, the indicator will pop out immediately, which can be seen through the glass hole in the porcelain cap, it is often used in the electrical control equipment of machine tools. Spiral fuse. The breaking current is large, and it can be used for short-circuit maintenance in circuits with voltage level 500V and below and current level below 200A.
Enclosed fuse: There are two types of enclosed fuses: packing fuses and non-packing fuses, as shown in Figure 3 and Figure 4. The packed fuse is generally made of square porcelain tube, which is filled with quartz sand and melt, which can be broken strongly, and is used in circuits with voltage level below 500V and current level below 1KA. The unfilled closed fuse is loaded into a closed cylinder with a slightly smaller breaking capacity and is used in power grids or distribution equipment below 500V and 600A.
Fast fuse: Fast fuse is mainly used for short-circuit maintenance of semiconductor rectifier components or rectifier devices. Because the overload of semiconductor components can be very low. It can only withstand large overload currents for a very short time, so short-circuit maintenance with the ability to fuse quickly is required. The structure of the fast fuse is basically the same as that of the packed closed fuse, but the melt material and shape are different, and it is a V-shaped deep groove variable cross-section melt made of silver sheets.
Self-resetting fuse: Sodium metal is used as the melt, which has high electrical conductivity at room temperature. When a short-circuit fault occurs in the circuit, the high-temperature short-circuit current causes the sodium to vaporize rapidly, and the vapor sodium appears in a high-resistance state, thus restricting the short-circuit current. When the short-circuit current disappears, the temperature drops, and the sodium metal regains its original good conductivity. The self-resettable fuse can only constrain the short-circuit current, and cannot really break the circuit. The advantage is that the melt does not have to be replaced, and it can be reused.
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Structural characteristics of high-voltage busway - Vernal
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