30.03.2026
How to correctly select thermal overload protection for a star-delta starter?
The Star-Delta (Y-D) start-up is one of the most popular methods for limiting the inrush current of induction motors. However, what seems simple in theory often causes practical challenges when selecting the right protective equipment. A calculation error can lead to either “nuisance” tripping or, even worse, a burnt-out motor winding.

