Medium Voltage Contactors Short Circuit Protection 3

[EECR7]

Is there a specific standard or industry practice that mentions how to protect medium voltage contactors against short circuits?

 

[dpc]

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.