4、ontrol.Soconsistency of performance oftheACcontactorhasgreateconomicsignificance.Butfurtherdevelopmenthassofarbeenconstrainedbyitselectricallifewhichbelowthemechanicallife’slevel.Thedirecteffectonelectricallifeiselectricarcthathasproducedinswitchingprocess.Especiallyundertheuseofca