Metal oxide varistor marking metal oxide varistor 20v510 varistor model harris varistors v 20v275 text. Basics horsepower hp a measure of the rate at which work is done 1 hp 746 watts 33,000 lbftmin 550 lbftsec power kw hp x 0. Select the right varistors for overvoltage circuit protection. For example, a metal oxide varistor has a different build than a series built out of crystals. Metal oxide variators mov or now generically referred to as siovs are commonly rated by their rms withstanding voltage or 385vac in this case, then above this by a joule rating 05 which seems low. Metaloxide varistors movs radial lead varistors tmov. The varistors symmetrical, sharp breakdown characteristics enable it to provide excellent transient suppression performance.
Normally, the mov has very high electrical resistance. Varistor basics varistors primarily consist of arrays of zincoxide zno balls, in which the zno was altered with small amounts of other metal oxides such as bismuth, cobalt, or manganese. Mov14dxxxk series metal oxide varistor rohs directive 200295ec jan. Varistors vary quite heavily between different models. The metal oxide varistor surge arresters movas are ceramic devices with highly nonlinear electrical characteristics similar to those of backtoback zener diodes. Varistor and the metal oxide varistor tutorial electronicstutorials. Pdf on the use of metal oxide varistors as a snubber.
It is generally manufactured from a material such as zinc oxide, zno, although another material that is used is silicon carbide, sic and this provides similar properties. Please fill in the table and then change the color to white or invisible. The most common modern type of varistor is the metaloxide varistor mov. Metal oxide nanoparticles brookhaven national laboratory. Simple and inexpensive, the mov absorbs the energy in. These devices have a high transient current handling capability when high voltage is applied. If you have questions about which harris metal oxide varistor you should order or you dont see the exact harris metal oxide varistor you need for your application, we can help. Leakage current region pdf available october 20 with 323 reads how we measure reads. A metal oxide varistor starts conducting current at rated voltage and it stops the conduction if the applied voltage is below the threshold value. The first generator was used for basic mov testing in order to produce the. Sep 22, 2015 the operation of metal oxide varistor and silicon carbide varistor are very similar. During the sintering process the metal oxide powder transforms to a dense ceramic body with varistor properties. Energy typical capacitance part number acrms dc dc volts 1 time vc ip 2 ms 10 1,000 s at 1 khz volts volts min. Figure 5 shows the simplified equivalent circuit of a metal oxide varistor.
The nte metal oxide varistors feature a barrier layer that gives the user fast response time. Energy typical capacitance part number acrms dc dc volts. The surfaces of the intercrystalline fracture follow. Pdf comparative study of metal oxide varistors movs for. This type contains a ceramic mass of zinc oxide grains, in a matrix of other metal oxides such as small amounts of bismuth, cobalt, manganese sandwiched between two metal plates the electrodes. A varistorvoltage dependent resistor vdr is a component which has a voltage current characteristics that is. From this the behavior of the varistor can be interpreted for different current ranges. They are cheap to manufacture, which means they are often used in inexpensive surge protectors. They have been intensively used in high power, high voltage applications. A varistor is an electronic component with an electrical resistance that varies with the applied. Metal oxide varistor b72220t2k101 thermofuse varistor advanced series etfv20ke2 kb kh pe 20070426 please read important notes at the end of this document.
The metal oxide varistor or mov for short, is a voltage dependant resistor in which the resistance material is a metallic oxide, primarily zinc oxide zno pressed into a ceramic like material. Variable resistors, such as the potentiometer and the rheostat, have ohmic characteristics. It is called so as the component is made from a mixture of zinc oxide and other metal oxides like cobalt, manganese and. Leakage current region aug 17, 2011 how a common surge strip works explained by ge global research engineer bill morris. The name varistor is a portmanteau of varying resistor. Application guidelines overvoltage protection metaloxide. The term is only used for nonohmic varying resistors. Metal oxide varistor mov technology is the most prevalent technology utilized in electrical transient protection products today. These varistors are used to protect circuits against excessive voltages. This type contains a ceramic mass of zinc oxide grains, in.
A metal oxide varistor, or mov, is an electronic component that protects equipment from voltage surges in a power line, such as from lightning strikes. Nte1v010 thru nte1v300 nte2v010 thru ntev480 nte524v thru. Vdr metal oxide varistors standard additional resources ordering information the varistors are available in a number of packaging options. Many industry manufacturers, including current technology, integrate various sizes of radial or straptype movs into their products. May 14, 2018 suntan is with very good support for multilayer metal oxide chip varistor. They are a type of nonlinear device that feature similar characteristics to zener. Metal oxide nanoparticles marcos fernandezgarcia, jose a. But dependent on the application, many other properties may play a role.
Littelfuse varistors basic properties, terminology and. Pdf metal oxide varistors movs are the essence of surge protection devices. Tsv dipped varistor ul vde and tsvc smd varistor youtube. Varistor symbol and applications metal oxide varistor. Simple and inexpensive, the mov absorbs the energy in a surge, preventing it from damaging other devices in a circuit. Apr 18, 2020 the metal oxide varistor is not a perfect solution to power surges. Simple charge pump boosts input voltage by 50% this chargepump circuit, using just a few diodes and capacitors, ups the input voltage by a factor of 1. Metal oxide varistor resistors mov online electronic surplus. Metal oxide varistor b72214q0511k101 energetiq series q14k510 kb kh pe 20070905 please read important notes at the end of this document. Bulk on tape and reel on tape in ammopack fanfold the basic ordering code for each option is given in tables titled varistors on tape on reel, varistors on tape in ammopack and varistors in bulk. Littelfuse varistors basic properties, terminology and theory. The downside is that if they stop a power surge, they can effectively burn out, but the user may have no idea this has happened. Vfd power quality issues protecting the vfd drops out below 70% voltage 30% sag.
It is generally manufactured from a material such as zinc oxide, zno, although another. Suntan is with very good support for multilayer metal oxide chip varistor. For this we take mov metal oxide varistor which is the most common type of varistor. A surge in excess of the specified withstanding surge current may cause short circuits or package rupture with expulsion of material. Specifications are subject to change without notice. Varistor or voltage dependent resistor vdr resistor guide. C iii metal oxide varistor series 6, second generation of metal oxide varistors. Jameco sells metal oxide varistor and more with a lifetime guarantee and same day shipping. Our online catalog includes information on hundreds of harris metal oxide varistors, such as specifications, photos and recommendations for accessories or other items. For this we take mov metaloxide varistor which is the most common type of varistor. A metal oxide varistor mov is an electronic device that protects an appliances power supply from voltage spikes and surges in the ac power line.
The key to explaining metaloxide varistor operation lies in understanding the. On the use of metal oxide varistors as a snubber circuit in solidstate breakers conference paper pdf available october 20 with 323 reads how we measure reads. To specify a resistor, the most important parameter is resistance. Allowable voltage varistor voltage withstanding surge current 8 20. If lightning strikes a nearby power line, the high voltage causes the mov to become a shunt, preventing the electrical surge from harming. For some situations such has high gain amplifiers in audio applications, resistor noise is an unwanted phenomenon. The gemov surge suppressor was developed first in 1973 by john d. Varistor working principle types metal oxide varistor. Electronics tutorial about the varistor and metal oxide varistor or mov which is used in power electronics circuits for protection against transients.
Metaloxide varistor marking metal oxide varistor 20v510 varistor model harris varistors v 20v275 text. The most famous type of varistor is metal oxide varistor mov, which is also called as zno varistor. Nte1v010 thru nte1v300 nte2v010 thru ntev480 nte524v thru nte524v48 metal oxide varistors mov description. Page 3 of 8 vi characteristic 105 104 103 102 101 10. The main difference between a silicon carbide varistor and a metal oxide varistor is the amount of leakage current. Metal oxide varistor mov, basics, working, specifications. A surge in excess of the specified withstanding surge current may cause short circuits or package rupture with expulsion. V xx e xxx harris varistor designation nominal disc diameter 07, 10, 14, 20mm, shown below. The metal oxide varistor, mov, is the most widely used form of varistor. Varistors are voltage dependent, nonlinear devices which have an electrical behavior similar to backtoback zener diodes. The basic dimensions in figure 1 to 5 are valid for types with either round or square. They have become more and more important during the past four decades due to their highly nonlinear electrical characteristics and their large energy absorption capacity.
The series of a varistor varies depending on the voltage it can. Application guidelines overvoltage protection metal. The nte metal oxide varistors feature a barrier layer that gives the user fast. The metal oxide varistor is designed to protect various types of electronic devices and semiconductor elements from switching and induced lightning surges.
This type contains a ceramic mass of zinc oxide grains, in a matrix of other metal oxides, such as small amounts of. Many industry manufacturers, including current technology, integrate. Each zno grain of the ceramic acts as if it has a semiconductor junction at the grain boundary. Help identifying a varistor electrical engineering stack. Metal oxide varistor described above, the mov is a nonlinear transient suppressor composed of zinc oxide zno silicon carbide varistor at one time this was the most common type before the mov came into the market. Metal oxide varistor resistors mov online electronic. The series of a varistor varies depending on the voltage it can hold, the devices it is used to control, and the type of power used in its build. Metal oxide varistors consist of approximately 90% zinc oxide as a ceramic base material plus other filler materials for the formation of junctions.
A simple equivalent circuit representing a metal oxide varistor as a capacitance in parallel with a voltage dependent resistor is shown in the. Page 4 of 11 characteristics 25 c ordering code type varistor voltage at 1 ma v clamping voltage at 100 a 820. Inorganic and bioinorganic perspectives october 2007 chemistry department brookhaven national laboratory p. It is called so as the component is made from a mixture of zinc oxide and other metal oxides like cobalt, manganese and so on and is kept intact between two electrodes which are basically metal plates. Metal oxide varistors, more commonly known as movs are devices that provide excellent transient voltage suppression. The metal oxide varistor or mov is a voltage dependent, nonlinear device that provides excellent transient voltage suppression. A metal oxide varistor mov is a nonlinear device which, than the normal line voltage while surge current flows, there is. Users should verify actual device performance in their specific applications. An attractive property of the metal oxide varistor, fabricated from zinc oxide zno, is that the electrical characteristics are related to the bulk of the device. Amperes volts amperes joules pf 11 14 16 20 100 36 1 0. The power so developed must be within the specifications shown on the. Failure study of metaloxide surge arresters sciencedirect.
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