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Is (MX and XF) built in MCCB (NSX AND NS)?

For  ( Compact NSX MCCB up to 630 A ):

-Kindly be informed that we don't need a closing coil XF as the power needed for closing for this range is not high.For more clarification, kindly find attached PDF from the catalogue .
-The MX coil is optional.

For Compact NS (630b to 3200 A ):

-the XF Coil is not used with Compact NS and the MX is optional.
- you can only install 1 MN or MX as there is only one slot.( attached photo )

-The XF closing coil is usually used With Masterpact NT or NW Air circuit breakers.

Abbreviations:
(MX: Shunt release auxiliary )
(MN: Under-voltage detection auxiliary )
(XF: closing Coil  )
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