Abstract: The intelligent switch can control the line voltage or current to turn on and off at the desired phase,effectively reduce the switching inrush current and overvoltage caused by the high-voltage switch when the capacitor bank is switched,and eliminate the circuit overvoltage caused by the switching-off reignition. The intelligent switch developed by Shandong Zhengben Power Electric Co.,Ltd. for a 10 kV high voltage shunt capacitor set in a substation is independently driven by three-phase power. It can be switched on and off at the same time,and can also be controlled by phase. It has the characteristics of short switching time,no bounce when switching on,small rebound when switching off and manual switching off function. The operation test shows that it fully meets the requirements of high voltage shunt capacitor banks for intelligent switch.