Hello The triangle star or delta star starter circuit has three contactors. the first is the main one and the other two are delta connection and star connection the ones in charge of connecting in star or delta are the contactors and in the motor no bridge is made, that is, the three coils are open and the contactors are in charge of closing in one or the other connection First the main and star contactor will enter along with the timer. When the timer ends the counting, the star takes off and the delta comes in, remaining like this until the engine is turned off Remember: first it is a star and then delta. Not the other way around. The function of this is to decrease the initial intensity which will be √3 times lower in star than in delta. regards