S07k300 varistor 300vrms 7mm radial epcos inc datasheet pdf. Click select file at right to choose the newer file version you want to compare. Leadfree, halogenfree and rohs compliant options available. Pdf metal oxide varistors movs are the essence of surge protection devices and have dominated the market with their highly. The most common type of vdr is the metal oxide varistor or mov. 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. Excessive voltage triggers the mov into action, so to size it for surge. Both versions are comprised of radial leaded movs metal oxide varistors with an integrated.
The term is only used for nonohmic varying resistors. This type of structure utilises a diode characteristic to provide the variable resistance. The varistor is bidirectional and is based around a ceramic or metal oxide. Setup file is completely standalone and also its an offline installer. Even though the name varistor is derived from the terms variable resistor, the resistance in varistor cant be varied manually unlike potentiometer or rheostat where the resistance can be varied manually between their maximum and minimum values. S07k300 varistor 300vrms 7mm radial epcos inc datasheet pdf data sheet free from datasheet data sheet search for integrated circuits ic, semiconductors and other electronic components such as resistors, capacitors, transistors and diodes. Sep 22, 2015 varistor provide protection by voltage clamping method which is similar to that in a zener diode. If only a single diode is used, then it only acts in one direction, but back to. Varistor article about varistor by the free dictionary. S20k11 varistor 11vrms 20mm radial epcos inc datasheet pdf data sheet free from datasheet data sheet search for integrated circuits ic, semiconductors and other electronic components such as resistors, capacitors, transistors and diodes. The original design developed for mov failure mode identification will also be explained. The name varistor is a portmanteau of varying resistor. Thermally protected tmov and itmov varistor series the littelfuse tmov and itmov thermally protected varistors represent a new development in integrated circuit protection. A varistor is an electronic component with an electrical resistance that varies with the applied.
The mov 14dxxxk series of 14 mm radial leaded varistor devices protects against overvoltage transients such as lightning, power contact and power induction. Mov files commonly use the mpeg4 codec for compression. Amperes volts amperes joules pf 11 14 16 20 100 36 1 0. When the circuit is exposed to a high voltage transient, the varistor starts to conduct and clamps the transient voltage to a safe level. Their resistance decreases when the voltage increases. Most relevant lists of abbreviations for mov metal oxide varistor. As a result this form of device is often called a metal oxide varistor, or mov. Specifications are subject to change without notice. Varistor roducts radial leaded varistors lv ultramovtm varistor series note. You can see below how a varistor is placed in parallel to the circuit it needs to protect and that its connected directly to ground. Packages here are some examples of different packages which are often encountered.
Since the varistor has such a high resistance, current does. Varistor a semiconducting resistor whose electrical resistance conduction varies nonlinearly and equally under the influence of. The littelfuse tmov 25s and tmov34s varistor series are specifically designed for applications that must meet the requirements of the limited current, abnormal overvoltage test in the ul1449 3rd edition surge protection device spd standard. Varistor introduction the word varistor is an acronym, and is a combination of the words variable resistor used to describe their mode of operation way back in their early days of development which is a bit misleading since a varistor can not be manually varied like a potentiometer or rheostat. The varistor voltage is the voltage v c,or v cma between both end terminals of a varistor when speci. Connecting varistor and surge arrester in series electrical.
Mov14dxxxk series metal oxide varistor rohs directive 200295ec jan. Metal oxide varistor is a voltage dependent resistor. The word is composed of parts of the words variable resistor. Nvs03 varister, sv03ys varistor diode, used in kenwood models, hss101 diode, view as. Due to covid19 situation shipping and delivery services will be affected. They are available in many values for specific voltage ranges. The devices have a high current handling, high energy absorption capability and fast response. Metal oxide varistors, or movs are typically made from a small diskshaped metal zinc oxide material. Vdr metal oxide varistor zinc oxide varistor voltagedependent resistor. Also known as a voltagedependent resistor vdr, it has a nonlinear, nonohmic currentvoltage characteristic that is similar to that of a diode. Metaloxide varistors movs radial lead varistors za series.
The maximum dc voltage that can be applied continuously to a varistor. However, windows media player can open only early versions of the file extension. Compare pdfs, how to compare pdf files adobe acrobat dc. Download the free library loader to convert this file for your ecad tool.
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. Mov is a format developed by apple and used for movie and other video data storage. It may contain multiple tracks that store different types of media data and is often used for saving movies and other video files. It is also a nonlinear device and provides very good transient voltage surge protection. General information the mov 10dxxxk series of 10 mm radial leaded varistor devices protects against overvoltage transients such as lightning, power contact and power induction.
Users should verify actual device performance in their specific applications. A varistor is an electronic component that protects expensive devices from harmful power surges, much like a shock absorber. The grabcad library offers millions of free cad designs, cad files, and 3d models. When the voltage to a circuit is low or within acceptable limits, the varistor has a very high resistance. Varistor provide protection by voltage clamping method which is similar to that in a zener diode. Average power dissipation of transients not to exceed 0. Applications power supplies power systems line voltage telecom systems white goods appliances mov14dxxxk series metal oxide varistor rohs directive 200295ec jan. Simple and inexpensive, the mov absorbs the energy in a surge, preventing it from damaging other devices in a circuit. Avx offers ultralow capacitance esd protection in the sub 1pf range for use in automotive circuits that are sensitive to capacitance. The varistors consist of a disc of low zno ceramic material with two solid copper leads s20 types only or copper clad steel wire. For the selected sar ef470x sparkover voltage could be anywhere from 400 to 588 v and for mentioned mov s20k250 its 300 v. A varistor is an electronic component with an electrical resistance that varies with the applied voltage. This nonlinear effect may occur over all, or only part, of the currentvoltage characteristic.
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 specifications shown on the. The measurement shall be made as quickly as possible to avoid heating effects. Typical applications include motor control, telecom, solenoid, and power supply circuits to protect. 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. In contrast to a diode however, it has the same characteristic for both directions of traversing current. S20k11 varistor 11vrms 20mm radial epcos inc datasheet. Variable resistors, such as the potentiometer and the rheostat, have ohmic characteristics. However, when the surge voltage exceeds the varistor voltage, the impedance across the varistor terminals decreases sharply. Circuit protection from transient voltage by varistor. Download movavi pdf editor a pdf manipulation tool that enables you to merge files and append new pages to existing documents, as well as manage images inside pdf files. 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. Marking the varistors are marked with the following information.
S20k11 varistor 11vrms 20mm radial epcos inc datasheet pdf. Mov 14dxxxk series metal oxide varistor rohs directive 200295ec jan. Pdf comparative study of metal oxide varistors movs for. 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. Lv ultramov varistor series rohs amazon web services.
For this reason, varistors are also called metaloxide varistors mov. The resistance of a varistor is variable and depends on the voltage applied. Metaloxide varistors movs radial lead varistors za series description the za series of transient voltage surge suppressors are radial leaded varistors movs designed for use in the protection of low and mediumvoltage circuits and systems. An movs voltage rating, called the varistor voltage is the voltage across a varistor when a current of 1ma is passed through the device. The tinned copper alloy terminals are suitable for snpb and leadfree wave and reflow solder. For the 230 vac mains they recommends sar of 470 or 600 v, b. The tmov 25s and tmov 34s series meet the surge suppressor component recognition requirements of ul1449 for both cordconnected. A mov file is a common multimedia container file format developed by apple and compatible with both macintosh and windows platforms. Pdf with the growing demand for application of metaloxide varistor mov in lowvoltage electronic. To achieve the lowest possible protection level as described in chapter selection procedure, section 1. Features n high voltage rating n high current rating n bidirectional n surge protection n fast response time n rohs compliant n agency listing.
They are coated with ul 94 v0 approved ocher colored halogen free epoxy, which provides electrical, mechanical and climatic protection. Features high voltage rating high current rating bidirectional surge protection fast response time rohs compliant agency recognition. Join the grabcad community today to gain access and download. Any twoterminal solidstate device in which the electric current i increases considerably faster than the voltage v. A surge in excess of the specified withstanding surge current may cause short circuits or package rupture with expulsion of material. The ciii varistor series of metaloxide varistors movs. Maximum continuous rms voltage series numbers 592 for vdrs05 593 for vdrs07 594 for vdrs10 595 for vdrs14 596 for vdrs20 safety marks on vdrs101420 types. The energy of the incoming surge is partially conducted and partially absorbed, protecting the circuit. Mov files may contain video, audio, timecode, and more. Pdf condition monitoring and deterioration analysis of metal. To overcome the limitations of semiconductor based varistors like silicon carbide varistors, the metal oxide varistors mov have been developed. Allowable voltage varistor voltage withstanding surge current 8 20. Stacking many varistors in a series as one varistor can increase the clamp voltage of a mov. Varistor symbol and applications metal oxide varistor.
V n, where n is a number ranging from 3 to 35 depending on the type of varistor. The automotive sub pf varistor aspv is available in 0. Buy mov metal oxide varistor online in india at lowest price and best quality only on attention. Mov radial 125 vac varistors, 140 vac 198 v to 242 v varistors, 14 mm mov varistors, mov 250 vac varistors, mov 250 vac 1. Voltage dependent resistors are often used as surge suppressors for sensitive circuits.
I have a doubt about proper values of mov and sar when they are connected in series as suggested in epcos app notes see below fig. The metal oxide varistors offer a choice of varistor voltages from 18 v to 1800 v and vrms voltages from 11 v to v. Definition varistors are nonlinear twoelement semiconductors that drop in resistance as voltage increases. That means that sar will ignite when spikes larger then 700 to 888 vdc appears on the input. A simple varistor circuit learning about electronics. Please confirm technical specifications before you order andor use. Varistors are available for a broad range of specifications and are classified by maximum voltage, clamp voltage, peak current, surge energy and response time. Mar 31, 2020 download movavi pdf editor a pdf manipulation tool that enables you to merge files and append new pages to existing documents, as well as manage images inside pdf files. This type is commonly known as the metaloxide varistor mov. Nvd metal oxide varistor disc type koa speer electronics, inc. Traditional radial throughhole mov metal oxide varistor devices are available in diameters of 5mm, 7mm, 10mm, 14mm, 20mm and 25mm. Since the varistor has such a high resistance, current does not flow through it. A mov file is an mpeg4 multimedia container file format developed by apple. May 23, 2019 a mov file is a common multimedia container file format developed by apple and compatible with both macintosh and windows platforms.
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