Power grid side filter circuit and device

The utility model discloses a power grid side filter circuit and device, and belongs to the technical field of power grids. A power grid side is sequentially connected with a leakage protector, a frequency converter and a motor, the frequency converter and the motor are further connected with a switch control module, a filter module is respectively connected with the switch control module and the frequency converter, and the switch control module is in a switch-off state in a power-on process of the frequency converter. The loop where the first leakage current generated according to the three-phase alternating current is located is disconnected, and abnormal disconnection of the leakage protector in the power-on process is avoided; the switch control module is also in a switch-on state when the power-on of the frequency converter is completed, so that a second leakage current generated according to the action of the frequency converter and a third leakage current generated according to the work of the motor a