상황
A star-delta starter control circuit needs to prevent simultaneous energization of the star and delta contactors while providing visual phase-status indication from all three incoming lines.
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01
Use NC auxiliary contacts from each contactor in series with the opposite coil for electrical interlocking
02
Add a seal-in contact across START to keep the main contactor energized after release
03
Include three phase indicator lamps connected phase-to-neutral for clear supply presence visual feedback
Reusable for industrial motor starters where two contactors must be mutually exclusive, with phase supervision lamps on a three-phase supply.