In the high-voltage circuit of an electric vehicle, the main electrical component of the hvil system is the high-voltage connector. However, the manual maintenance switch (MSD) is a human-operated element that serves as the electrical interface for circuit turn-on/break-off.
On the one hand, it initiates the protective measure of safely disconnecting the high-voltage electricity when the circuit of the high-voltage system is disconnected, or its integrity is damaged. On the other hand, it is used to confirm the integrity of the entire high-voltage system.