I.ProductSelectionGuide
1.Applicableplaces
Productclassificationandbasicfeatures,functions,andscopeofapplication
2.Classificationandcharacteristics
2.1Typesofelectricalappliances
1)Numberofpoles
Theswitchisdividedinto1,2,3,4polesaccordingtothenumberofpoles.
2)Currenttype
ThecurrenttypeoftheswitchisdividedintoACorDC.
2.2Theratedvalueofthemaincircuit
1)Nominalvoltage
(1)ThenominalvoltageofACsystemproductsis:220/380Vand380/660V.
(2)ThenominalvoltagesofDCsystemproductsare:110V,220Vand440V.
2)Current
(1)Itisagreedthatthefreeairheatingcurrentisthecurrentvalueusedforthetemperaturerisetestoftheunclosedelectricalapplianceundertheconditionofnoventilation.
(2)Itisagreedthattheenclosedheatingcurrentisspecifiedbythemanufacturer,anditisusedtoconducttemperaturerisetestsonelectricalappliancesinstalledinthespecifiedenclosure.
(3)Theratedworkingcurrentisspecifiedbythemanufacturer,andtheratedworkingcurrentisdeterminedbytheratedworkingvoltage,theratedfrequency,theratedworkingsystem,theusecategoryandthetypeofenclosureprotection.Seethemanufacturer'ssamplefortheratedworkingcurrent.
(4)Therateduninterruptedcurrentisspecifiedbythemanufacturerandisthecurrentthattheelectricalappliancecarriesforalongtimeundertheconditionofuninterruptedworkingsystem.
3)Theratedfrequencyisthepowerfrequencyusedtodesignelectricalappliancesandrelatedtoothercharacteristicvalues.Domestically,itis50(60)Hz.
2.3Thearcextinguishingmediumisdividedintoairandvacuum.
Second,constructionandinstallationpoints
Reliableelectricshockprotectionshouldbeprovided.
Thepositioniscorrect,theinstallationisfirm,andtheallowabledeviationofverticalityis1.5%.