In the motor control circuit, the function of no or low voltage protection is to ( ).

A、keepthepowersupplyvoltagestabletopreventthesupplyvoltagefromdecreasing;
B、preventthemotorfromstartingautomaticallywhenthepowersupplyisrestoredafterpowerfailure;
C、realizeshort-circuitprotection;
D、Realizeoverloadprotection