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The arc is maintained by thermal dissociation. Reducing the temperature of the arc can weaken the thermal dissociation and reduce the generation of new charged ions. At the same time, it also reduces the motion speed of charged particles and strengthens the composite effect. The arc temperature can ... Read More
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The arc is mainly composed of arc column area, cathode area and anode area: 1. The arc column region is electrically neutral. It is composed of molecules, atoms, excited atoms, positive ions, negative ions and electrons. The positively charged ions are almost equal to the negatively charged ions, so ... Read More
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Fuse in the IEC127 standard defines it as "fuse link". It is an electrical component installed in the circuit to ensure the safe operation of the circuit. Fuse is actually a short circuit protector, widely used in power distribution system and control system, mainly for short circuit protection or ... Read More
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A. Melt fusing 1. Normal fusing due to short circuit fault or overload operation. Troubleshooting: Before installing a new fuse link, first find out the cause of melt fusing. If the cause of fusing is not determined, do not replace the fuse link for trial delivery. 2. If the fuse link is used for ... Read More
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Breaking capacity is one of the important indicators that reflect the fuse's ability to ensure circuit safety and the safety of other parts in the circuit. The parameter unit of breaking capacity is ampere, which means that the fuse can safely break the maximum current of the circuit. That is to say... Read More
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The I²t value is one of the important indicators of the selected fast fuse, that is, the fuse fusing time t is related to the size of the fusing current I, and its law is inversely proportional to the square of the current. All kinds of electrical equipment (including power grid) have certain ... Read More
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The I-t curve for design and selection completely reflects the functional relationship between the two, from which the fusing time of the fuse under any current load can be found, but a curve can only reflect the average value of one specification fuse, and the actual test results should be near the ... Read More
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The safety function of the fuse refers to that the high-quality and reliable fuse should ensure the safety before, during and after its operation, that is, safely conduct and fuse. The main technical index that can guarantee the requirement of fuse is the breaking capacity. Breaking capacity refers ... Read More
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Low-voltage fuse is composed of insulating base (or support part), contact, melt, etc. The melt is the main working part of the fuse. The melt is equivalent to a special wire in series in the circuit. When the circuit is short-circuited or overloaded, the current is too large, and the melt melts due ... Read More
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(1) Main advantages of fuse: ① Good selectivity. As long as the rated current of the fuse link of the upper and lower fuses meets the requirements of 1.6:1 overcurrent selection ratio specified in the national standard and IEC standard, that is, the rated current of the upper fuse link is not less ... Read More
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