Meaning of 3P2D, 3P3D, 4P3D, 4P4D in MCCBs

There are Molded Case Circuit Breakers (MCCBs) on which some notations are given as 3P2D, 3P3D, 4P3D, 4P4D. Can someone give a brief information on this?

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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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