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