The JNFK series intelligent electronic capacitor switching switch is a new generation of electronic products, divided into two types: co compensation and sub compensation. The co compensation type is used for switching three-phase capacitors and adopts the △ connection method; The split compensation type is used for switching single-phase capacitors, using the Y-type connection method. The biggest advantage of this switch is the use of microcontroller technology, which is a combination of software and hardware. During operation, based on the phase sequence characteristics of the three-phase electricity, the microcontroller is used to switch each phase of the capacitor during several AC cycles according to the phase of each phase, thereby achieving the switching process of parallel capacitors without inrush current and overvoltage. This switch has significant advantages such as no impact, low power consumption, long service life, and low fault. It can replace AC contactors and capacitive contactless switches and is widely used in the field of low-voltage reactive power compensation.