>> P.106
MetalOxideVaristorPowerlineSPDSignallineSPDSPDforLANandcoaxialOthersMetalOxideVaristorCS-440-24-006VesidaloltagearistoroltageSsteoltageNoralOdealerforanceDeeloentgoalhenonohicehaiorNormalresistiveelementZnOelementILogI(current)VLogV(voltage)ZincOxide(ZnO)VaristorAHighlyNon-OhmicVaristorProtectsElectricDevicesfromLightningSurgesMetaloxidevaristors(MOVs)MVBlocksTechnicaldataITEMDiameterUnitmm3222323032333236362536283633363641224130413341364127413632.0±0.832.0±0.832.0±0.832.0±0.836.0±1.036.0±1.036.0±1.036.0±1.041.0±0.841.0±0.841.0±0.841.0±0.841.0±0.841.0±0.8Heightmmh22.0±1.030.5±1.033.0±1.036.0±1.025.1±1.027.8±1.033.2±1.036.0±1.022.0±1.030.5±1.033.0±1.036.0±1.027.0±1.036.0±1.0DM54.0DM55.5DM56.0DM56.5DH104.5DH105.0DH106.0DH106.5DH104.0DH105.5DH106.0DH106.5SL104.5SL106.0UrUres10.614.615.917.312.313.716.417.810.614.615.917.312.616.8ArrresterclassicationNominaldischargecurrentSuggestedratedvoltageResidulvoitage(Max)kAkVkVBasedonIEC60099-43ndEd.andIEEEC62.11MicrogramofMOVsurfaceImageofmicrostructureFig.MicrostructureofZnOvaristorelements.StandrrentAeferencerrentlogIANoinalDischargecrrentMicrostructureAcomplexstructureofmicrovaristorsconsistingofZincoxidegrainsandsurroundinghigh-resistancegrainboundarylayers,connectedinseriesandparallel.Therefore,ifthesizeoftheZincoxidegrainsisthesame,thevaristorvoltageisproportionaltothethicknessandthesurgewithstandcapabilityisproportionaltothecross-sectionareaoftheMOV.(Phototakenbyourscanningelectronmicroscope)106ZincOxide(ZnO)VaristorFig.IdealV-IcharacteristicsofMOVElectricalcharacteristicsComparedtoordinaryresistiveelements,MOVshaveaverylargenon-linearvoltage-currentcharacteristic,sotheyactasinsulatorsinareaswheretheappliedvoltageissmall,andasconductorsinareaswherethevoltageislarge,suchasinlightningsurges.Thismakesitpossibletosafelyprotectequipmentfromlightningsurges.
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