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What is the difference between the undervoltage coils MN , MNs and MNx of NG125 MCB.

The difference betweenthe undervoltage coils MN , MNx and MNs of NG125 MCB is given below
 
MN
- undervoltage release
- tripping and opening of the associated circuit-breaker: if supply voltage drops between 70 and 35 %
- reclosing: forbidden if supply voltage is not restored (e.g.: emergency breaking by pushbutton)
 
MNs
- delayed undervoltage release
- allows a 0,25 second time delay on brownout or voltage drop
 
MNx
- undervoltage release unaffected by power cuts.
 
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