Zinc oxide varistor tvr seriesproductsvetng thinking ltd. Transient vc clamping transient voltage transient current protected smd transient voltage suppressors n formation or designer overvoltage clamping voltage level. Metal oxide varistors consist of approximately 90% zinc oxide as a ceramic base material plus other filler materials for the formation of junctions between the zinc oxide grains. Metal oxide varistor is a voltage dependent resistor.
The metal oxide varistor or mov is sintered during the manufacturing operation into a ceramic semiconductor and results in a crystalline microstructure that allows movs to dissipate very high levels of transient energy across the entire bulk of the device. However, windows media player can open only early versions of the file extension. Smd transient voltage suppressors table of contents. Buy your mov10d431k from an authorized bourns distributor.
Connecting varistor and surge arrester in series electrical. Metal oxide varistor mov data sheet pulse electronics. A surge in excess of the specified withstanding surge current may cause short circuits or package rupture with expulsion of material. The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of. The varistors consist of a disc of low zno ceramic material with two solid copper leads s20 types only or copper clad steel wire.
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. The resistance material in a metal oxide varistor mainly consists of zinc oxide. It is also a non linear device and provides very good transient voltage surge protection. The metal oxide varistors offer a choice of varistor voltages from 18 v to 1800 v and vrms voltages from 11 v to 1100 v. The mov 07dxxxk series of 7 mm radial leaded varistor devices protects against overvoltage transients such as lightning, power contact and power induction. A simple equivalent circuit representing a metal oxide. Bourns mov14d301k mov14d series metal oxide varistor. Measuring the energy handling capability of metal oxide. Ed80 types are heavyduty metal oxide varistors designed mainly for industrial. Metaloxide varistors movs radial lead varistors tmov. E related documents znr transientsurge absorbers in order to download the selected file, please check and accept our terms and conditions pdf file.
Applications n power supplies n power systems n line voltage n telecom systems n white goods appliances mov 20dxxxk series metal oxide varistor rohs directive 2015863, mar 31, 2015 and annex. Tvs varistor, 11 v, 14 v, mov07dxxxk series, 36 v, disc 7mm, metal oxide varistor mov. The information provided is accurate at the time of printing. Traditional radial throughhole mov metal oxide varistor devices are available in diameters of 5mm, 7mm, 10mm, 14mm, 20mm and 25mm. They have the capability to absorb high transient energies and can suppress both positive and negative transients.
They are planted in the devices in such a manner that it will short itself when a high current is produced due. The most common type of varistor is the metaloxide varistor mov. They are a type of nonlinear device that feature similar characteristics to zener diodes. Applications n power supplies n power systems n line voltage n telecom systems n white goods appliances mov20dxxxk series metal oxide varistor rohs directive 2015863, mar 31, 2015 and annex. Therefore, movs are typically used for the suppression of lightning and other high energy transients found in industrial or ac line. A single mov or two movs in series works to clamp linetoneutral surges but doesnt help you much for a lineneutraltoearth surge. For example if there is a power surge, the varistor, normally having a very high resistance, responds to the voltage spike by absorbing its energy with a very low resistance. Tvs varistor, 275 v, 350 v, mov10dxxxk series, 710 v, disc 10mm, metal oxide varistor mov. However, when the surge voltage exceeds the varistor voltage, the impedance across the varistor terminals decreases sharply. Select varistors that are suitable for the operating voltage.
Metal oxide varistors, more commonly known as movs are devices that provide excellent transient voltage suppression. Mov metal oxide varistors testing all about circuits. Varistor datasheet, varistor pdf, varistor data sheet, datasheet, data sheet, pdf. Treat it like two zener diodes cathode to cathode in a package with their anodes exposed. Varistor symbol and applications metal oxide varistor. It describes the puncture failure mode of the zno varistor, caused by melting of the region with local current. Mov is whats inside a lot of small surge supressors in a sturcture having a multigrain ceramic semiconductor.
Varistors mov a varistor or metal oxide varistor mov is a special resistor that is used to protect circuits against high transient short term voltage. It is also a nonlinear device and provides very good transient voltage surge protection. A simple varistor circuit learning about electronics. Metal oxide varistor mov to overcome the limitations of semiconductor based varistors like silicon carbide varistors, the metal oxide varistors mov have been developed. Metal oxide varistor tvr series, for surge protection, professional manufacturer, high quality, from china original factory. 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. How to convert mov files to various formats and vice versa the process of conversion is very easy with movavi software. Pdf metal oxide varistors movs are the essence of surge protection devices and have dominated the market with their highly nonlinear. To overcome the limitations of semiconductor based varistors like silicon carbide varistors, the metal oxide varistors mov have been developed. The tmov and itmov varistor s integrated thermal element, in conjunction with appropriate enclosure design, helps.
The ability of the varistor to limit the transient voltage is sometimes expressed in terms of a clamp ratio. The capacitance parameter in varistor data sheet electrical. The metal oxide varistors offer a choice of varistor voltages from. This type is commonly known as the metaloxide varistor mov. Users should verify actual device performance in their specific applications. Simple and inexpensive, the mov absorbs the energy in a surge, preventing it from damaging other devices in a circuit. Electronics tutorial about the varistor and metal oxide varistor or mov which is used in power electronics circuits for protection against transients. Metal oxide varistor mov, basics, working, specifications. Varistors vishay varistors provide a reliable and efficient way to protect against highvoltage transients and surges. Fuses should be chosen to limit current below the level where damage to the mov package could occur.
Plastic package, 1 varistor skvc 20 a 251 skvc 20 a 460 250 460 120 120 45 45 45 45 145 121 plastic package, 1 varistor 1 capacitor 1if skvc 20 a 460 615 180 320 560 615 745 750 220 390 680 750 910 15 15 15 15 15 15 00 00 00 00 00 00 plastic package, 3 varistors skvc skvc skvc skvc skvc 221 391 681 781 911 140 250. Splitting the mov into two series elements with the arrester at the midpoint going to earth gives you the most protection at the expense of two extra parts. You dont need to be familiar with programming, video formats, or settings just run the software, choose your video, select a preset, click convert and thats it. Diodes ap62600 6 a synchronous buck converter provides highefficiency stepdown dcdc conversion. Pdf comparative study of metal oxide varistors movs for. Generally, the fuse should be placed in series with either the varistor or the source ahead of the varistor.
Frequency converter consists of acdc and dcac inverters. This paper gives an overview of the failure modes of the zno varistors and investigates the characteristics of the varistor when subjected to repetitive current pulses. March 30, 2011 ultramov varistor series radial lead varistors ultramovtm series speci. This mov circuit will clamp up to 300vac if a power surge allowing transients into the circuit were to be that high. Product index circuit protection tvs varistors, movs. Because varistors only dissipate a relatively small amount of average power they are not suitable for repetitive applications that involve substantial amounts of average power dissipation. A varistor is an electronic component with an electrical resistance that varies with the applied. Tvs varistor, 250 v, 320 v, mov14dxxxk series, 650 v, disc 14mm, metal oxide varistor mov. Panasonics mov are also know as znr, which stands for zincoxide nonlinear resistor.
They are coated with ul 94 v0 approved ocher colored halogenfree epoxy, which provides electrical, mechanical and climatic protection. The test for a metal oxide varistor is to take it above its breakdown with a low current high voltage, to see if it conducts and what the clamp voltage is. Metal oxide varistor mov data sheet features wide operating voltage v 1ma range from 18v to 1800v fast responding to transient overvoltage large absorbing transient energy capability low clamping ratio and no followon current meets msl level 1, per jstd020. Circuit protection from transient voltage by varistor. Mov metal oxide varistor a component used to suppress voltage transients. Mov 14dxxxk series metal oxide varistor rohs directive 200295ec jan. Mov is listed in the worlds largest and most authoritative dictionary database of abbreviations and acronyms the free dictionary.
Varistor and the metal oxide varistor tutorial electronicstutorials. 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. The devices have a high current handling, high energy. These ul recognized varistors require very little mounting space, and are offered in various standard lead form options. When the voltage increase above the threshold of the varistor, the suppressor draws a rapidly increasing current. In the event of receiving this voltage, the mov would clamp and shunt the excess power safely to ground, so that the excess current would not flow through the ac motor but through the varistor. Mov is a format developed by apple and used for movie and other video data storage. Eaton bussmann electrical division eaton electronics division kemet littelfuse inc. The metal oxide varistors offer a choice of varistor voltages from 18 v to 820 v and v rms voltages from 11 v to 510 v. How do you select a fuse to prevent failure of an mov. Micro commercial co murata electronics panasonic electronic components phoenix contact. Thinking tvr varistor the first brand of mov shipments.
The mov 14dxxxk series of 14 mm radial leaded varistor devices protects against overvoltage transients such as lightning, power contact and power induction. The operating values of a mov need to be derated at high temperatures as shown in figure 1. 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. Mov 250 vac varistors are available at mouser electronics. This component is used to protect electrical devices from high transient voltages. Because standard metal oxide varistors, gas arresters, and avalanche diodes do not provide the user with a visual indication of the integrity of the protection capacity, an external means of testing is required. Specifications are subject to change without notice.
Varistors provide reliable and economical protection against. Features n high voltage rating n high current rating n bidirectional n surge protection n fast response time n rohs compliant n agency listing. These surges and spikes attacks the equipment by the power line and will destroy the power supply of the equipment. Metal oxide varistor basics mov is the most commonly used type of varistor. Movs are used to protect electronic equipment against voltage surges.
Mov14dxxxk series metal oxide varistor rohs directive 200295ec jan. A varistor is an electronic component that protects expensive devices from harmful power surges, much like a shock absorber. For example, consider a varistor applied to protect the power terminals of electrical equipment. Protection from lightning there are a number of electrical components that can be used to help provide electrical surge or lightning protection, such as avalanche diodes or gas discharge tubes, but the primary protection device in use is the metal oxide varistor mov. Looking for online definition of mov or what mov stands for. Znr stands for zincoxide nonlinear resistor also known as varistor or mov. Was brauche ich, um eine mov datei in eine pdf datei zu konvertieren bzw. Buy your mov14d391k from an authorized bourns distributor. A varistor voltage dependent resistor vdr is a component which has a voltage current characteristics that is very much similar to that of a diode. Panasonics mov are available in various disc dimensions 5mm to 20mm diameter, varistor voltages and ul certificated. They are used to protect vulnerable electronic circuits and components from overvoltage conditions that can cause damage.
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