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What is the difference between a removable locking device and a fixed locking device for the Compact NS and NSX 100 to 630 range.

The removable locking device enables the MCCB to be locked in the OFF position only and is removable from the device.
29370 Removable Lock device
The fixed locking device enables the MCCB to be locked in the OFF or ON position but is fixed to the device.
LV429371 Fixed Locking device 100..250ALV432631 Fixed  Locking device above 630A
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