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1、电气设计中低压交流接触器的选用（SelectionoflowvoltageACcontactorinelectricaldesign）SelectionoflowvoltageACcontactorinelectricaldesignLowvoltageACcontactorismainlyusedforbreakingthepowersupplyofelectricalequipment.Itcancontrolthepowerequipmentremotelyandavoidpersonalinjurywhenthepowersupplyisdisconnected.Thesel
2、ectionofACcontactorisveryimportanttothenormaloperationofpowerequipmentandpowerline.First,thestructureandparametersofACcontactorTheACcontactordeviceiscompactinstructureandeasytouse.Themagneticblowdeviceofthestaticanddynamiccontactisgood,thearcextinguishingeffectisgood,andthezeroflyingarcandthete
3、mperaturerisearethebest.Accordingtothearcextinguishingmode,itisdividedintoairtypeandvacuumtype,anddividedintoelectromagnetic,pneumaticandelectromagneticpneumatictypeaccordingtotheoperationmode.Theratedvoltageparametersofcontactoraredividedintohighvoltageandlowvoltage,lowvoltageisgenerally380V,5
4、00V,660V,1140Vandsoon.ThecurrentisdividedintoACandDCaccordingtoitstype.Thecurrentparametersincluderatedoperatingcurrent,prescribedheatingcurrent,connectioncurrentandbreakingcurrent,auxiliaryheatingcurrentofcontactandshorttimewithstandcurrentofcontactor.Thegeneralcontactortypeparametergivesthepr
5、escribedheatingcurrent,andtheratedcurrentcorrespondingtotheheatingcurrenthasseveral.Forexample,CJ20-63,ratedworkingcurrentofmaincontactisdividedinto63A,40A,modelparametersin63referstovheatingcurrent,anditscontactorcasinginsulationstructure,andtheratedcurrentandtheselectedloadcurrentandvoltagele
6、vel.ACcontactorcoilisdividedinto36,127,220,380Vandsoonaccordingtovoltage.Thenumberofcontactorisdividedinto2,3,4,5poles,etc..Auxiliarycontactsaccordingtonormallyopennormallyclosedeachpair,accordingtothecontrolneedstochoose.Otherparametersincludeconnection,breakingtimes,mechanicallife,electricall
7、ife,maximumallowableoperatingfrequency,maximumallowablewiringdiameter,sizeandinstallationsize,etc..Theclassificationofcontactorisshownintable1.Two.SelectionprincipleofACcontactorAsthecontactorswitchingloadofpowersupplyequipment,th
