a single point detecting current sensor includes a plurality of magnetic sensor modules , wherein a magnetic sensor module is installed onto each busbars with an insulation displacement contact or is installed adjacent to each busbar , and outputs the current through a busbars measured by a magnetic sensor ; a signal collection module collecting measured signals output by the plurality of magnetic sensor modules ; and a signal interference compensation module deriving a corrected current value for which interference has been removed , by calculating the mutual interference between said busbars using the signals collected by said signal collection module .