CJ19(16) series A.C. contactors are suitable for frequency 50/60Hz,rated insulation voltage up to 1000V,rated operation current 9~330A under AC-3 duty.It is mainly used for making/breaking electric circuits at a long distance & for frequent starting/stopping & controlling A.C. Motors.It is used in combination with thermal relay to compose a magnetic motor starter, so.The products accords with such standards as IEC60947-4-1 & GB14048.4.