Over-current protective device of frequency converter

The utility model belongs to the technical field of circuit overload protection, and discloses an over-current protective device of a frequency converter. According to the over-current protective device of the frequency converter, an on/off state of a frequency converter power supply can be controlled by monitoring the temperature of a pre-charged resistor of the frequency converter. The over-current protective device of the frequency converter is characterized by comprising a temperature control unit, a power supply control unit and a temperature monitoring unit; a probe of the temperature monitoring unit is arranged at the periphery of the pre-charged resistor, an output terminal of the temperature monitoring unit is connected with an input terminal of the temperature control unit; an output terminal of the temperature control unit is connected with an input terminal of the power supply control unit; and the power supply control unit is connected between a power supply and an inlet wire of the frequency con