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What is the difference between a QC and a QCD breaker?

The QCD breaker is DIN rail mountable (standard 35mm DIN rail), as built "standard" at the factory; the QC breaker is not DIN rail mountable, as standard.  With an optional accessory, QCDINADAPT, clipped onto the back of a standard QC breaker, a QC breaker becomes DIN rail mountable.  One QCDINADAPT device per QC breaker pole is required in order to properly secure a QC breaker to standard 35mm DIN rail.