Electric locomotive fault monitoring protector

The utility model relates to an electric locomotive malfunction watching and protecting device, which comprises a casing, a signal sampling circuit provided in the casing, a signal processing and control circuit and a malfunction displaying circuit, wherein the input port of the signal sampling circuit is connected with a voltage regulating switch of the electric locomotive control circuit and a thyristor; the output port of the signal sampling circuit is connected with the input port of the signal processing and control circuit; the output port of the signal processing and control circuit is connected with the malfunction displaying circuit, which is connected with the power supply. Adopting SS3 electric locomotive control circuit for watching and protecting malfunction, the utility model can identify 15 normal malfunctions and 4 nonnormal functions and display and memorize the malfunction position through LCD. Compared with current technology, the utility model can not only prevent direction-over malfunction in time, but also display the malfunction positions accurately and the driver can shoot the malfunctions according to the display for ensuring the driving safety.