ZK series intelligent switch is fill switch (ZK-50-1) and separate compensation switch (ZK-50-2), total compensation switch for switching capacitor, using a triangle connection method; separate compensation switch is used for switching single-phase capacitor and the Y-shaped connection. The intelligent switch selects the intelligent switching module, the suction arc module and the mechanical switch parallel operation, which has the advantages of the arc extinguishing in the moment and the breaking off. Intelligent switch with significant advantages of no impact, low power, longevity of service, alternative contactor and thyristor switch. It is widely used in low-voltage reactive power compensation, but also can be used as the substitute for AC contactor.