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. On the use of metal oxide varistors as a snubber circuit in solidstate breakers. Mov14dxxxk series metal oxide varistor rohs directive 200295ec jan. The surge arrester installed in the field is submitted. Jvr10n561k datasheet pdf pinout metal oxide varistor. Tama is supplying transient voltage surge suppressors, metal oxide varistor, nv series. Mov metal oxide varistors testing all about circuits. Metal oxide varistor electronics repair and technology news. Metal oxide varistor tvr series, for surge protection, professional manufacturer, high quality, from china original factory. Metaloxide varistors movs tmov and itmov varistor series. Metal oxide varistors movs radial lead varistors ciii varistor series should transients occur in rapid succession, the average power dissipation is the energy wattseconds per pulse times the number of pulses per second. Vdr metal oxide varistors standard additional resources ordering information the varistors are available in a number of packaging options. Pdf comparative study of metal oxide varistors movs for.
They are used to protect vulnerable electronic circuits and components from overvoltage conditions that can cause damage. A varistorvoltage dependent resistor vdr is a component which has a voltage current characteristics that is very much similar to that of a diode. Pdf reliability evaluation of metal oxide varistors for. The tinned copper alloy terminals are suitable for snpb and leadfree wave and reflow solder. Metal oxide varistor mov, basics, working, specifications. The mov07dxxxk series of 7 mm radial leaded varistor devices protects against overvoltage transients such as lightning, power contact and power induction. Specifications may be changed at any time without prior notice. Completely uptodate, this is the first comprehensive monograph on metal oxide varistors with a focus on microstructure, conduction mechanisms, device failures, ageing, additive impacts and future varistor systems. 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.
Pdf the degradation of zinc oxide elements under under ac or dc operating voltage and impulse currents is described. The za series of transient voltage surge suppressors are radiallead varistors movs designed for use in the protection of low and medium voltage circuits and systems. The power so developed must be within the specifications shown on the. Pdf metal oxide varistors movs are the essence of surge protection devices and have dominated the market with their highly. Metal oxide varistor devices are typically utilized because they are easier to build and control a majority of extreme power and voltage surges. This component is located near the ac supply input and before the bridge rectifier.
Zinc oxide varistors are electronic ceramic materials whose electrical behavior is dominated by grainboundary interface states. Sep 22, 2015 the operation of metal oxide varistor and silicon carbide varistor are very similar. Pdf comparative study of metal oxide varistors movs. 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. Users should verify actual device performance in their specific applications.
The objective of this paper is to analyze the ageing of metal oxide varistors mov due to surges by the changes of the nonlinear behavior. Jun 08, 2015 the burning issue of metal oxide varistors and how to stop thermal runaway. If lightning strikes a nearby power line, the high voltage causes the mov to become a shunt, preventing the. Large withstanding surge current capability 0 radial. Comparative study of metal oxide varistors movs for failure mode identification. Penlington university of northumbria, newcastle upon tyne, uk metal oxide varistors are znobased ceramic devices having highly nonlinear currentvoltage characteristics similar to those of the back to back zener diodes.
Varistor and the metal oxide varistor tutorial electronicstutorials. Analysis of metal oxide varistor arresters for protection of multiconductor transmission lines using unconditionallystable cranknicolson fdtd. The surfaces of the intercrystalline fracture follow the znograin boundaries. Reliability evaluation of metal oxide varistors for maintenance scheduling. The main difference between a silicon carbide varistor and a metal oxide varistor is the amount of leakage current. Electronics tutorial about the varistor and metal oxide varistor or mov which is used in power electronics circuits for protection against transients.
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 name is a portmanteau of variable resistor, which is misleading since it is not continuously uservariable like a potentiometer or rheostat and is capacitor rather than resistor at low field. Rga series zinc oxide varistors are nonlinear resistors, consisting mainly of zinc oxide and several kinds of. Within the useful varistor voltage range, the voltagecurrent relationship is approximated by the expression. They use these mov metal oxide varistors for light ballast circuits they are these very small and the color is blue with the circuit turned off, how do you test and check mov varistor compoents. 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. Thus, mov manufacturers are unable to tap the market for low voltages. Many industry manufacturers, including current technology, integrate various sizes of radial or straptype movs into their products. Typical applications include motor control, telecom, automotive.
Zinc oxide varistor tvr seriesproductsvetng thinking ltd. Pdf on the use of metal oxide varistors as a snubber. The name varistor is a portmanteau of varying resistor. The most famous type of varistor is metal oxide varistor mov, which is also called as zno varistor. Measuring the energy handling capability of metal oxide.
Global metal oxide varistors market is segmented by type into surface mount and disc. California 91605 phone 818 7658300 toll free 800 8277422 fax 818 7652387 d2 rga varistor varistors are voltage dependent, nonlinear devices which have an electrical behavior similar to backtoback zener diodes. Movs or metal oxide varistors are a very popular product and widely used. They are mainly used in the protective circuits of voltage sensitive electronic devices. Aug 28, 2007 metal oxide varistor mov are voltage dependent symmetrical resistors intended to protect equipment from transient voltages resulting from lightning strikes. The burning issue of metal oxide varistors and how to stop. Varistor symbol and applications metal oxide varistor. Zenamic features large surge current handling ability and transient overvoltage handling. Varistor voltage clamping characteristics can be defined at various test levels. The ciii varistor series of metaloxide varistors movs are specifically designed for. Metal oxide varistor mov rugged and reliable overvoltage protection. They exhibit a highly nonlinear currentvoltage relation with a 5%. Metal oxide varistors definition of varistor terms rated rms voltage, rated dc voltage the maximum designated values of power system voltage that may be applied continuously between the terminals of a device varistor voltage test characteristic that is used to classify varistors by type.
Varistors, also called metal oxide varistors movs, are used to protect sensitive circuits from a. Metal oxide varistors, more commonly known as movs are devices that provide excellent transient voltage suppression. Metal oxide varistor datasheet pdf, equivalent, schematic,datasheets, transistor, cross reference, pdf download, free search site, pinout. For example, a potentiometer is a metal oxide varistor that provides protection against potential power surges and excessive voltage. Varistors are in stock and ship sameday at mouser electronics from industry leading manufacturers. Degradation of metal oxide varistors caused by electrical stresses. Measuring the energy handling capability of the metal oxide varistors m. They are a type of nonlinear device that feature similar characteristics to zener diodes. Metal oxide varistors consist of approximately 90% zinc oxide as a ceramic base material plus other filler materials for the.
Pdf degradation of metal oxide varistors caused by electrical. A metal oxide varistor starts conducting current at rated voltage and it stops the conduction if the applied voltage is below the threshold value. Thinking tvr varistor the first brand of mov shipments. Electronic component search and free download site. Normally, the mov has very high electrical resistance. A varistor is an electronic component with an electrical resistance that varies with the applied. Metal oxide varistor tvr type pdf free download docplayer. We also have an extensive resource database for sourcing and crossreferencing parts. The metal oxide varistor, mov, is the most widely used form of varistor. The term is only used for nonohmic varying resistors. A test current of 1 ma dc is typically used to determine. Metal oxide varistor mov technology is the most prevalent technology utilized in electrical transient protection products today. A test current of 1ma dc is typically used to determine varistor voltage classification type. Metal oxide varistors by jinliang he overdrive rakuten.
The devices have a high current handling, high energy absorption. I put my ohm meter across a mov varistor and i got no ohm resistance reading it just said o. Metaloxide varistors movs ciii varistor series littelfuse. Metal oxide varistors high energy disc varistor series metal oxide disc varistors features the disc varistor series of transient surge suppressors are industrial provided in disc form for unique packing by highenergy disc varistors movs intended for special applications customer requiring unique electrical contact or packaging methods. Littelfuse metal oxide varistors mouser electronics. Specifications are subject to change without notice. Investigation of various models for metal oxide varistors springerlink. Zenamic is the registered trademark for our oxidized metal varistors. The itmov varistor differs from the tmov varistor by the inclusion of a third. They are primarily protective devices to dump the current in excessive over voltage events and so save the circuit board or end equipment. This component is used to protect electrical devices from high transient voltages. To assure our customers quality harris metal oxide varistors and other products and services at international standards, galco maintains iso90012000 certification. Maximum surge current, 820 s waveform which a varistor is rated to withstand for a single surge.
Make us your source for harris metal oxide varistors and other products. 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 power so developed must be within the speci cations shown on the device ratings and speci cations table for the speci c. Select the right varistors for overvoltage circuit.
Jvr10n561k datasheet, jvr10n561k pdf, jvr10n561k pinout, equivalent, replacement metal oxide varistor rfe, schematic, circuit, manual. The use of mov not only reduces the chance of electrical damage buut also improves equipment reliability. Metal oxide varistors when to use varistor vs tvs diode. A surge in excess of the specified withstanding surge current may cause short circuits or package rupture with expulsion of material.
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