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What is the difference between 3p2d and 3p3d for NSX MCCB's?

The 3p2d is a 3 pole MCCB frame, however only L1 and L3 on this MCCB are operational, L2 serves no purpose. For Example LV429620 which is detailed as: Circuit breaker Compact NSX100F - TMD - 100 A - 3 poles 2d

Note: It is the two outer poles that are active, the connections for the center pole are not fitted.

LV429620 Compact NSX 100A 2pole 3p2d illustration of poles
Where as the 3p3d is a 3 pole MCCB and has detection on all 3 of the phases and all 3 poles are active
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