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The wiring is like this:
[[30KW Motor ---- Star Delt Starter(100A Breaker inside) ----- 200A Breaker------50A Breaker(Inside the breaker box which located inside the factory) -----100A Main Breaker]]
Once I try to start the Motor, the Main Breaker trips immediately.

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Q: What cause the Main Breaker trips when I start a 30KW 3-phase Motor(Star Delt Starter)?
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