DOL Starter Diagram - Direct Online Starter for 3 Phase DOL (Direct Online Starter) Wiring Diagram. In the above dol starter diagram. The R,Y,B is the three phase 380 volts supply. The coil of the contactor is 380 VAC. And the normally open and normally close push button shown. the contactor connection with thermal overload relay and the motor connection with overload relay is shown. Also the earth DOL Starter Wiring Diagram (Direct Online Starter) Dec 03, 2018In which the three phase induction motor connection shown and all the direct online starter wiring shown with simple steps. Then read the below article and learn from simple dol starter wiring diagram. 3 phase motor contactor wiring diagram. Note that the single phase dol starter wiring diagram is also like this.