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                                                  To meet the customer’s requirements, we add the residual current automatic tracking setting and memory functions to the intellectual residual current circuit breakers. These functions, based on the suggestions from the grassroots power administrative department, are developed to solve the problems of the residual current changing with the electric load, and the changing seasons and weather causing difficulties to the power management’s proper setting of hand-action position of the protection device, and the inability to ensure the correct protecting action when the fault grounding dangerous current is very small.