The JNKCS series fast capacitive contactless switches are electronic products that can be used to connect power capacitor loads to the power grid. This product is specifically designed for situations where switch and control devices need to be installed, and can achieve fast switching of pure capacitor or series reactance (up to 14%) step compensation systems. Not only can symmetrical three-phase current compensation be achieved, but single-phase current step-by-step compensation can also be carried out on the power grid.