Recycling zinc from metal oxide varistors through leaching. Zenamic features large surge current handling ability and transient overvoltage handling. The new nt series of thermofuse varistors consists of a disk varistor connected in series with an integrated ther mally coupled fuse designed to trip in the. Zenamic is the registered trademark for our oxidized metal varistors. A varistor is an electronic component with an electrical resistance that varies with the applied. The square series varistors are 25mm and 34mm devices, with thicknesses ranging from 1.
They are used to protect vulnerable electronic circuits and components from overvoltage conditions that can cause damage. This type contains a ceramic mass of zinc oxide grains, in a matrix of other metal oxides, such as small amounts of. Electrical specifications and ordering codes maximum ratings ta 85 c ordering code type siovvrms v vdc v imax 820 s a wmax 2 ms j pmax w vrms 75 v b72240b0750k001 b40k75 75 100 25000 190 1. The tinned copper alloy terminals are suitable for snpb and leadfree wave and reflow solder. The devices have a high current handling, high energy absorption capability and fast.
Distributor of metal oxide, thermofuse and multilayer varistors. Amperes volts amperes joules pf 11 14 16 20 100 36 1 0. They are a type of nonlinear device that feature similar characteristics to zener diodes. Vdrh series vdr metal oxide varistors high surge vishay. A gadget may have thousands of transistors, resistors and other components, but only one or two.
Siov metal oxide varistors smd varistors standard series, cu types seriestype. Metal oxide varistor is a voltage dependent resistor with symmetrical voltagecurrent characteristics that is designed to protect all kinds of electronic devices or elements from switching and induced lightening surges. Use multisim to simulate varistor ni community national. California 91605 phone 818 7658300 toll free 800 8277422 fax 818 7652387 d2 rga varistor varistors are voltage. The impulse generator influences the time domain waveshapes of the current through and the voltage over the varistor. Nippon chemicon corporation metal oxide varistorstnr manufacturing and selling capacitors and electronics components. Metal oxide varistors, more commonly known as movs are devices that provide excellent transient voltage suppression. Metal oxide varistors movs are a type of resistor with significantly nonlinear currentvoltage characteristics commonly used in power lines to protect against overvoltages. Specifications are subject to change without notice. Zinc oxide based metal oxide varistors mov are widely used electrical surge protection components. 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. The oxides of antimony, bismuth, and to a lesser degree cobalt, manganese.
Metal oxide varistor mov elpro offers varistors with peak current ratings from 6,500a70,000a, peak energy ratings from 70j10,000j, and various mounting options to serve a wide range of applications. Metal oxide varistor is a voltage dependent resistor with symmetrical voltagecurrent. Metal oxide varistors are nonlinear circuit components that conduct large currents when the applied voltage exceeds a certain value, usually volts ac rms. Varistor symbol and applications metal oxide varistor. The varistors are available in a number of packaging options. Causes of a surge can include lightning strikes and electrostatic discharges. Sep 22, 2015 metal oxide varistor mov to overcome the limitations of semiconductor based varistors like silicon carbide varistors, the metal oxide varistors mov have been developed. They are coated with ul 94 v0 approved ocher colored halogen free. Varistor and the metal oxide varistor tutorial electronicstutorials. A metal oxide varistor, or mov, protects sensitive electronic equipment from voltage spikes in the power line. Investigations into recycling zinc from used metal oxide. Metal oxide varistor mov, basics, working, specifications. Due to the high concentration of zinc in movs, it is a better choice to recycle them as opposed to landfilling.
Mov14dxxxk series metal oxide varistor rohs directive 200295ec jan. In the intended application, the varistors conduct in the presence of large voltage transients, such as from a lightening strike. Siov siov metal oxide varistors metal oxide va ristors 2008 published by epcos ag corporate center edition 112007 ordering no. Features include high energy absorption and surge load capabilities, low leakage currents, selfprotection under abnormal overvoltage conditions, multilayer structures, lead free. Vdrs series vdr metal oxide varistors standard vishay. General technical data climatic category to iec 600681 408556 operating temperature to iec 61051 40. Nippon chemicon offers varistors, which are also suitable for automotive compliance according to aecq200. This form of varistor is the most widely used and it is the form that is often referred to when the term varistor is stated. Siov metal oxide varistors block varistors, highe series seriestype. Metal oxide varistor surge absorber element dia 05 o5. Numerical modelling of metal oxide varistors boris zitnik1, maks babuder1, michael muhr2, mihael zitnik3 and rajeev thottappillil3 1 milan vidmar electric power research institute, ljubljana. Radial lead varistors ultramovtm 25s varistor series. It is called so as the component is made from a mixture of zinc oxide and other metal oxides like cobalt, manganese and.
Metal oxide varistors movs metal oxide varistors movs technical library. The specified voltage shall be applied between both terminals of the specimen connected together and the electrode inserted between the metal balls. See agency approval section for certificate download. Siov metal oxide varistors general technical information. Energy typical capacitance part number acrms dc dc volts. Cnr14d221k varistors datasheet pdf oxide varistors. The varistors consist of a disc of low zno ceramic material with two solid copper leads s20 types only or copper clad steel wire. Allowable voltage varistor voltage withstanding surge current 8 20.
Two existing models of zno varistors and surge arresters are evaluated by comparing the model predictions with the experimental results. The metal oxide varistor, with its extremely attractive priceperformance ratio, is an. 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. Download fulltext pdf on the use of metal oxide varistors as a snubber circuit in solidstate breakers conference paper pdf available october 20 with 323 reads. Leaded varistors b722 standard series please read cautions and warnings and page 6 of 46. It is also a non linear device and provides very good transient voltage surge protection. This behavior makes them suitable to protect circuits during voltage surges. Metal oxide varistors rga varistor varistors are voltage dependent, nonlinear devices which have an. Features electrical equivalents to leaded types siovs05s07 operating voltage up to 300 vrms smd plastic package rohscompatible suitable for lead free soldering pspice models available approvals ul iec.
Metal oxide varistors are nonlinear circuit components that conduct large currents when the applied. New product information aluminum electrolytic capacitors multilayer ceramic capacitors film capacitors metal oxide varistorstnr. Electronics tutorial about the varistor and metal oxide varistor or mov which is used in power electronics circuits for protection against transients. Metal oxide varistorsmov home products over voltage protection. The varistor is bidirectional and is based around a ceramic or metal oxide. For this reason, varistors are also called metaloxide varistors mov. Tge metal oxide varistor application,station arrester,distribution arrester. They are coated with ul 94 v0 approved ocher colored halogen free epoxy, which provides electrical, mechanical and climatic protection. Features include high energy absorption and surge load capabilities, low leakage currents, selfprotection under abnormal overvoltage conditions, multilayer structures, lead free plating terminal electrodes and large electrostatic resistance. Stacking many varistors in a series as one varistor can increase the clamp voltage of a mov.
The specified voltage shall be applied between both terminals of the specimen connected together. Ein varistor wird auch als vdr bezeichnet fur voltage dependent resistor, also spannungsabhangiger widerstand. Nippon chemicon corporation metal oxide varistorstnr. Peak pulse current capability i tm 40,000a high energy capability w tm 310j to 1200j no derating up to 85. Epcos metal oxide varistors are designed for specific applications and should not be used for purposes not identified in our specifications, application notes and data books unless otherwise. The most common modern type of varistor is the metaloxide varistor mov. 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 oxides, sandwiched between two metal plates, which constitute the electrodes of the device. Varistors are available for a broad range of specifications and are classified by maximum voltage, clamp voltage, peak current, surge energy and response time. Metaloxide varistors movs tmov and itmov varistor series.
Metal oxide varistor mov to overcome the limitations of semiconductor based varistors like silicon carbide varistors, the metal oxide varistors mov have been developed. Vdrs series vdr metal oxide varistors standard, available from vishay intertechnology, a global manufacturer of electronic components. The devices have a high current handling, high energy absorption capability and fast response times to protect against transient. Tge metal oxide varistor application,station arrester. The surge suppressor strips typically contain a circuit breaker and three or more metal oxide varistors. As a result this form of device is often called a metal oxide varistor, or mov. The most common modern type of varistor is the metal oxide varistor mov. Users should verify actual device performance in their specific applications. If you need more precise simulation then you should first check for a model from the manufacturer for the actu.
Metal oxide varistor is a voltage dependent resistor. A varistor is a voltage dependent variable resistor, of which a mov is one type. No breakdown leaded varistors b722 telecom series please read cautions and warnings and. A crude way to simulate is back to back zener diodes for bidirectional or a single zener for unidirectional. The metal oxide varistors offer a choice of varistor voltages from 18 820 volts and vrms voltages from 11 510 volts. They are a type of nonlinear device that feature similar characteristics to zener.
For this reason, varistors are also called metal oxide varistors mov. Pdf on the use of metal oxide varistors as a snubber. The design of modern high power, highdensity electronic systems necessitate the need for. Specifications and part number crossreferences specifications descriptions and. If a proper recycling plan is developed movs can be an excellent source of secondary zinc because they contain over 90 weight percent zinc oxide. D05, d07, d09, d10, d14, d18, d20 metal oxide varistor. Specifications and part number crossreferences specifications descriptions and illustrative material in this literature are as accurate as known at the time of publication, but are subject to changes without notice. Surge arresters, also known as lightning arresters, are an accessory often ordered on high. Metal oxide varistors movs are housed in a surge arrestor and composed of zinc oxide 90 wt% and other metal oxides such as antimony, bismuth, cobalt, manganese, and nickel.
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