Pdf comparative study of metal oxide varistors movs for. It is a mixture of zinc oxide grains and other metal oxides like cobalt, manganese etc. Metal oxide varistors mov part number cross reference guide. 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.
A test current of 1ma dc is typically used to determine varistor voltage classification type. A metal oxide varistor is a protective component that absorbs energy when a certain voltage is reached and dissipates that energy through heat. Both bi 2o 3rich and zn 7sb 2o 12 spinel phases are also usually present at the grain boundaries of the zno, but the presence of a bi 3zn 2sb3o14 phase is possible as well. Varistor voltage clamping characteristics can be defined at various test levels. Orders for general electric metal oxide varistors and other standard, instock items placed by 4 p. Metaloxide varistors movs ultramov varistor series mouser. Zinc oxide varistor tvr seriesproductsvetng thinking ltd. Metal oxide varistor b72220t2k101 thermofuse varistor advanced series etfv20ke2 kb kh pe 20070426 please read important notes at the end of this document. A resistor is a circuit that does not conduct electricity well. The boundary between each grain and a neighbor forms a diode. 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. Amperes volts amperes joules pf 11 14 16 20 100 36 1 0. 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.
This component is located near the ac supply input and before the bridge rectifier. Metal oxide varistors movs are a type of resistor with significantly nonlinear currentvoltage characteristics commonly used in power lines to protect against overvoltages. Due to the high concentration of zinc in movs, it is a better choice to recycle them as opposed to landfilling. A varistor is an electronic component that protects expensive devices from harmful power surges, much like a shock absorber. Metal oxide varistor mov market size, share, growth, trends. It deals with the transient voltage such that when it triggered shunts the current produced due to high voltages from the sensitive components. Dec 24, 2012 the primary component of surge protector is a varistor. Nippon chemicon offers varistors, which are also suitable for automotive compliance according to aecq200. The term is only used for non ohmic varying resistors. The use of mov not only reduces the chance of electrical damage buut also improves equipment reliability. Huge panel mount metal oxide varistors inventory same day shipping expert technical support. Pdf reliability evaluation of metal oxide varistors for. April 2004 iaei news 5 photo 1 is a 40 mm mov with an mcov rating of volts ac. It is used to protect the circuit from high voltage spikes by varying its resistance.
Within the useful varistor voltage range, the voltagecurrent relationship is approximated by the expression. Metal oxide varistor mov, basics, working, specifications. The most common modern type of varistor is the metaloxide varistor mov. It has a nonlinear voltagecurrent characteristics like that of a diode. 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. The tmov and itmov varistors are intended, in conjunction with appropriate enclosure design, to help facilitate spd module compliance to ul 1449, 3rd edition section 39. Varistor symbol and applications metal oxide varistor. Varistors vary quite heavily between different models. A varistor remains nonconductive as a shunt mode device during normal operation when voltage remains well below its clamping voltage. Nippon chemicon corporation metal oxide varistorstnr. Which are sandwiched between two metal plates, thus a diode junction is formed between the boundaries of each grain and its neighbour allowing the device.
A surge in excess of the specified withstanding surge current may cause short circuits or package rupture with expulsion of material. Zinc oxide varistor are nonlinear resistors utilize a semiconductor electronic ceramic element mainly composed of zinc oxide and its resistors change as a function of the applied voltage. The devices have high current handling, high energy absorption capability. 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.
Znozno grain boundary, rich of bismuth, which is a highly resistive phase, is the main cause of. Siov siov metal oxide varistors metal oxide va ristors 2008 published by epcos ag corporate center edition 112007 ordering no. Pdf comparative study of metal oxide varistors movs. Metal oxide varistor mov industry 2018 market research. Many industry manufacturers, including current technology, integrate various sizes of radial or straptype movs into their products. Apr 18, 2020 the metal oxide varistor is not a perfect solution to power surges. A metal oxide varistor mov is an individual electronic component that diverts extreme voltage to the ground or to neutral lines. Failure study of metaloxide surge arresters sciencedirect. Metal oxide varistor mov technology is the most prevalent technology utilized in electrical transient protection products today. Investigations into recycling zinc from used metal oxide. A metal oxide varistor is also known as a surgesuppressor. L20b metal oxide varistor, vac, 175vdc, 6500a peak, 1900pf, radial lead. Cross reference guide is for reference only, and please refer to our pdf specification.
Est are normally processed the same day next business day for weekend orders. Mov07dxxxk series metal oxide varistor rohs directive 200295ec jan. The metal oxide varistor surge arresters movas are ceramic devices with highly nonlinear electrical characteristics similar to those of backtoback zener diodes. Thinking tvr varistor the first brand of mov shipments. Article pdf available in american ceramic society bulletin 654. It s called varistor or transient surge absorbers 18v1. The information on this page applies to the following models. They are used to protect vulnerable electronic circuits and components from overvoltage conditions that can cause damage. There is no polarity for these leads and hence can be connected in both directions. Varistors are in stock and ship sameday at mouser electronics from industry leading manufacturers. The ciii varistor series of metal oxide varistors movs are specifically designed for applications requiring high surge energy absorption ratings and superior multiple pulse absorption rating. The operation of metal oxide varistor and silicon carbide varistor are very similar.
A metal oxide varistor is a device used as a component in electrical equipment. Metal oxide varistor mov market size, share, growth. Metal oxide varistors are similar to resistors and has only two leads. This nonlinearity makes them suitable for clamping the voltage to an acceptable level when a high voltage surge comes to transmission equipment due to switching operations or lightning. Jameco sells metal oxide varistor and more with a lifetime guarantee and same day shipping. A varistor is an electronic component with an electrical resistance that varies with the applied. The metal oxide varistors offer a choice of varistor voltages from. Users should verify actual device performance in their specific applications. Mov metal oxide varistor from the name we get to know that it is associated with oxides of metals.
Metal oxide varistor electronics repair and technology news. Zenamic is the registered trademark for our oxidized metal varistors. If a transient pulse often measured in joules is too high, the device may melt, burn, vaporize, or otherwise be damaged or destroyed. Variable resistors, such as the potentiometer and the rheostat, have ohmic characteristics. Sep 22, 2015 the operation of metal oxide varistor and silicon carbide varistor are very similar. Specifications are subject to change without notice. Metal oxide varistors, more commonly known as movs are devices that provide excellent transient voltage suppression. 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. Metal oxide varistors movs radial lead varistors tmov and itmov varistor series note. 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 metal oxide varistors offer a choice of varistor voltages from 18 820 volts and vrms voltages from 11 510 volts.
The metal oxide varistor, mov, is the most widely used form of varistor. The name varistor is a portmanteau of varying resistor. A metal oxide varistor mov is a protection component used in power supply circuits that is powered directly from ac mains. The metal oxide varistors offer a choice of varistor voltages from 18 v to 1800 v and v rms voltages from 11 v to 1100 v. This is achieved through a special dielectric material formulation which also results in. Metal oxide varistors mov part number cross reference guide 5mm series telfax. Page 3 of 8 vi characteristic 105 104 103 102 101 10 0 10 1 10 2 10 3 a 10 4 i 50 5000 v 60 80 100. The surfaces of the intercrystalline fracture follow the znograin boundaries. This catastrophic failure occurs when absolute maximum ratings in. For example, a metal oxide varistor has a different build than a series built out of crystals.
Metal oxide varistor mov market is likely to witness substantial growth at a healthy cagr of 11. Metal oxide varistor mov are voltage dependent symmetrical resistors intended to protect equipment from transient voltages resulting from lightning strikes. Metal oxide varistors consist of approximately 90% zinc oxide as a ceramic base material plus other filler materials for the formation of junctions. 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. Metal oxide varistor b72214q0511k101 energetiq series q14k510 kb kh pe 20070905 please read important notes at the end of this document. This type is commonly known as the metaloxide varistor mov. During the test 240 v ac were applied at 15 amps and the mov ignited. They are a type of nonlinear device that feature similar characteristics to zener diodes. 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. Allowable voltage varistor voltage withstanding surge current 8 20. The main difference between a silicon carbide varistor and a metal oxide varistor is the amount of leakage current.
Ultramov varistors are primarily intended for use in ac line voltage applications such as surge protection device spd, uninterruptable. These movs are mostly used to supply protection to electronic gadgets in case of highpeak pulse currents and highenergy surge transients, such as. Nippon chemicon corporation metal oxide varistorstnr manufacturing and selling capacitors and electronics components. 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.
Recycling zinc from metal oxide varistors through leaching. 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 varistor mov 14mm disc for ul1449 type 2 rohs u 4000 3000 2000 900 800 700 600 500 400 300 200 100 90 80 70 60 50 40 30. 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. Zenamic features large surge current handling ability and transient overvoltage handling. Mov14dxxxk series metal oxide varistor rohs directive 200295ec jan. Vdr metal oxide varistors standard additional resources ordering information the varistors are available in a number of packaging options. The mov07dxxxk series of 7mm and mov10dxxxk series of 10 mm, radial leaded varistor devices protects against overvoltage transients such as lighting, power contact and power induction. Metaloxide varistors movs radial lead varistors tmov. Metal oxide znobased varistor ceramics 331 conductors. They are cheap to manufacture, which means they are often used in inexpensive surge protectors. 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.
Metal oxide varistor tvr series, for surge protection, professional manufacturer, high quality, from china original factory. Items not currently in stock are given lead times based on previous sales and the shipping method you choose when placing your order. Zinc oxide varistor are non linear resistors utilize a semiconductor electronic ceramic element mainly composed of zinc oxide and its resistors change as a function of the applied voltage. Reliability evaluation of metal oxide varistors for maintenance scheduling conference paper pdf available june 2006 with 466 reads how we measure reads. Bourns mov product portfolio offers 7, 10, 14, and 20 mm radial leaded varistor devices which protect against overvoltage transients such as lightning, power contact and power induction. The devices have high current handling, high energy absorption capability and fast response times to protect against transient faults up to rated limits. Metal oxide varistors mov part number cross reference. Aug 28, 2007 metal oxide varistor mov are voltage dependent symmetrical resistors intended to protect equipment from transient voltages resulting from lightning strikes. The most common type of varistor used is metal oxide varistor mov. The power so developed must be within the specifications shown on the.