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What is the difference between 3P3D and 3P2D NSX breakers?

- 3P2D (3 Poles frame with 2 Poles detection) MCCB has an empty pole, it has only two power contacts inside even if the product looks like a 3P MCCB. 3P2D can be used for single phase applications, to control and protect the phase and neutral. 
- 3P3D (3 Poles frame with 3 Poles detection) MCCB is a 3P MCCB and thus it protects its 3 terminals not just 2 terminals 
- 4P3D (4 Poles frame with 3 Poles detection) MCCB will protect the 3 phases and won't sense any currents on the 4th pole as the 4th pole does not contain a CT and is not connected to Micrologic and thus won't protect the neutral. 
- 4P4D (4 Poles frame with 4 Poles detection) MCCB will protect the 3 phases + Neutral. 
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