3.What are the types of commonly used fuses?
Type meaning of fuse
1.The plug-in fuse is simple in structure, low in price, and easy to replace. When in use, insert the porcelain cover into the porcelain seat and remove the porcelain cover to replace the fuse. Plug-in fuses are often used at the end of low-voltage lines or branch circuits with rated voltages of 380V and below and rated currents of 5~200A for short-circuit protection of lines and electrical equipment, and for overload protection in lighting circuits.
2.The fuse tube of the spiral fuse is equipped with quartz sand, a fuse wire and a fuse indicator with a small red dot. The quartz sand is used to enhance the arc extinguishing performance. After the fuse is blown, there is a clear indication.
Once the fuse is blown, the indicator will pop up immediately, which can be observed through the glass hole on the porcelain cap. It is regularly used in the electrical control equipment. It has a large breaking current and can be used for short-circuit protection in circuits with a voltage level of 500V and below and a current level of 200A or below.
3.There are 2 forms of enclosed fuses: filled fuses and unfilled fuses. Filled fuse typically use sq. ceramic ware tubes, that are crammed with quartz sand and melt, and have robust breaking capacity. The fuse tube is formed of steel paper, and also the two ends are detachable caps fabricated from brass. Melting sheet, it’s additional convenient to interchange the melt.
Enclosed fuse are utilized in circuits with voltage levels below 500V and current levels below 1kA; non-packed closed fuses pack the melt into a closed cylinder, with a rather smaller breaking capacity, and are used in power networks or distribution systems below 500V and 600A. In electrical equipment.
4.The fast fuse is principally used for short-circuit protection of semiconductor rectifier parts or rectifier devices. Because of the low overload capability of semiconductor components.
It will solely face up to an outsized overload current terribly very short amount of time, therefore the short-circuit protection is needed to possess the power to quickly fuse. Its structure is largely identical to that of the encircled fuse with filler, however the soften material and form are different.
It’s a variable-section melt with a formed deep groove punched from silver.
5.The self-resetting fuse uses metal because the melt and has high conduction at area temperature.
Once a short-circuit fault happens within the circuit, the short-circuit current generates an extreme temperature to chop-chop vaporize the metal, and also the gamified sodium exhibits a high resistance state, therefore limiting the short-circuit current; when the short-circuit current disappears, the temperature drops, and the metal sodium restores its original smart electrical conductivity.
The reset table fuse will solely limit the short-circuit current and can’t very break the circuit. The advantage is that there’s no ought to replace the melt, and it is reused’re not perfect.
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