A switch operating mechanism As that normally open contact of the closing intermediate relay is arrange in the series in the forward control branch, A switch intermediate relay normally open contact is arranged in series in that reverse control branch, Ensure that the normally closed contact of the closing or shunting relay in the brake resistance branch is opened, and then close the normally opencontact of the closing intermediate relay or the normally open contact of the shunting intermediate relay in the forward rotation control branch or the reverse rotation control branch to ensure thatthe brake resistance branch is effectively opened when the switch is closed or shunted. The operating mechanism changes the timing when the brake resistance is connected to the motor branch, destroysthe condition that the positive and negative poles of the power supply are connected through the brake resistance, relieves the electric arc generated when the normally closed contact of the relay inthe brake resistance branch is disconnected when the switch is closed/opened, burns the hidden trouble of the relay, and realizes the quick start and stop of the motor of the switch operating mechanism.