The Compact NSX circuit breakers may be installed  horizontally, vertically or flat on their back, without derating performance levels.
There are three installation versions:
1. Fixed
2. Plug-in (on a base)
3. With draw-able (on a chassis).
For the Plug-in and Withdrawable versions the components must be added (base,chassis) to the fixed version.

For details pl refer the attachment.

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