CJ19 series changeover capacitor contactor is mainly applicable to a power line of AC 50Hzor 60Hz, rated working voltage up to 380V. It is used to put a low voltage parallel connected capacitor in operation or switch it off in a low voltage reactive power compensation device. The contactor is equipped with a surge suppressor, which can effectively reduce the surge current passing through the capacitor at switching on and suppress the over-voltage at switching off. The product is in conformity with the standards IEC947-4-1.