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nstallationofthecategoryⅲ,notconnectedtothemaincircuitoftcontrolcircuitforⅱinstallationcategory;●circuitbreakerprotectiongrade(iec60947-1standard)toachieveip30,cancelaftershield,upanddownforip20protectiongrade。●circuitbreakershallbeinstalledinthemediumwithoutexplosiondanger,noenoofconductivedustandgas;●circuitbreakershallbeinstalledwherethereisnorainandsnowhit;●circuitbreakershallbeinstalledaccordingtothepecification。

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tandundervoltagetrippingdeviceforⅲinstallationcategory,notconnectedtothemaincircuitofauxiliarycircuitandcontrol circuitforⅱinstallationcategory;●circuitbreakershallbeinstalledinmediumwithoutexplosionhazard,andmediumwithoutenoughmetalcorrosiodustandgas;●circuitbreakershallbeinstalledwherethereisnorainandsnowhit;●circuitbreakershallbeinstalledaccordingtothepecification。

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