I.ProductSelectionGuide
1. Luoghi applicabili
Productclassificationandbasicfeatures,functions,andscopeofapplication
2.Classificationandcharacteristics
2.1Typesofelectricalappliances
I) Numberofpoles
Theswitchisdividedinto1,2,3,4poles according to the number ofpoles.
II) Currenttype
ThecurrenttypeoftheswitchisdividedintoACorDC.
2.2Theratedvalueofthemaincircuit
I) Nominalvoltage
(1) Thenominalvoltageof ACsystemproductsis:220/380Vand380/660V.
(2) Thenominalvoltages of DCsystemproductsare: 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.
Secundo, constructionis et institutionis punctorum
Reliableelectricshockprotectionshouldbeprovided.
Thepositionis rectae, institutionis firmae, ac licitae deviationis verticitatis, 1.5%.