Category Archives: Three phase motor starting, star-delta configuration

Star-Delta starting

Protection with thermal overload relay Operating mode: When the Start button is pressed star contactor Q2 coil is energized. It closes and by means of normally open contact of Q1 the voltage is applied to main contactor Q1. Q1 closes and supplies the voltage to motor M1 in star connection. Q1 and Q2 are maintained via…
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