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What is the difference in function between the instantaneous under voltage release coil MN of NSX MCCB and the time delay one ?

The main function of both types is to trip the CB in case the supply voltage is lower than 0.7 Un.

The difference is that the time delay coil waits for certain time - varying if it is fixed or adjustable-before taking action as the cause of supply voltage decrease can be a temporary cause.
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