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What does 3P2D,3P3D,4P3D,4P4D mean for the NSX breakers?

3P2D - 3 Pole Breaker, 2 Trip ,Trip Unit Only 2 Poles
3P3D - 3 Pole Breaker , 3 Trip , Trip Unit 3 Poles
4P3D - 4 Pole Breaker , 3 Trip, Trip Unit Only 3 Poles
4P4D - 4 Pole Breaker , 4 Trip, Trip Unit 4 Poles
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