Accurately-adjustable over-load protection master control circuit board

The utility model relates to the field of over-load and over-current protection of electric equipment, in particular to an accurately-adjustable over-load protection master control circuit board, which consists of a power voltage input line, a current induction input line, a protection output control line, a manual control data input line and a high-performance microcomputer processing chip, wherein an output signal of the power voltage input line is connected with the high-performance microcomputer processing chip; a signal of the current induction input line and data of the manual control data input line are sent to the high-performance microcomputer processing chip; and after the signal and the data are judged and processed by the high-performance microcomputer processing chip, an executive command is sent by the protection output control line. The accurately-adjustable over-load protection master control circuit board can be used for constantly detecting whether circuits undergo the over-voltage, under-vo