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Medium Voltage Contactors Short Circuit Protection 3
- Thread starter EECR7
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3
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If you are talking about MV motor starters, the fuses in the starter are current-limiting. The opening of the contactor is generally delayed slightly to allow the fuse to clear the fault. 8 cycle dropout time was common at one time. This allows the fuse time to clear any fault that exceeds the interrupting rating of the contactor.
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