B&R 2BM100.9 DCS/PLC CONTROLLER IN STOCK

Wye-delta motor starting (one type of reduced-inrush system) sends full-line voltage the motor’s wye windings during startup — though voltage across each motor winding is reduced by the inverse of the square root of three (57.7%) which is why this arrangement is sometimes (rather inexactly) called reduced-voltage starting. Then a circuit (usually with a contactor for each phase, overload relay, timer, and mechanical interlock) switches the motor input to supply it full-line voltage into its delta windings.