CJ19 seroes change over capacitors mainly include CJ19-25, 32, 43, 63 and CJ19B-32,43,and it is suitable for the electric power system of AC 50Hz or 60 Hz, circuit voltage 380V fro making and breaking of selg-cure low voltage parallet capacitor with controllable capacitor up to 30 KVAR in the power factor compensating device, which can effectively reduce impulsion of switching rush current to capacitor and control the vervoltage when open circuit.