.Power quality monitoring .Power instrument and meter .Distributed measurement systems .Measurement of current of power supplyequipment below 10KV .Microcomputer protection Character: .Use high permeability silicon steel . Outdoor , water proof IP65,dust proof .Secondary winding employ with high qualityepoxy resin casting in plastic case which is flame retardant, anti-moisture,stable performance .Split core and full sealed ,use sealedwater proof cable as secondary leading wire