情境
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.
這張圖裡有什麼
看懂背後的決策。
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.