DCCB
Two poles seriesed for one side.
Breaker is adequately de-rated for use in dc circuits.
Only DINF, DIRS provided. DIT 5 will not work for dc.
In GFB, magnetic blowout coils used to increase the speed of rise of arc into the arc chutes for effective quenching.
ACCB
The inherent current zero of sine wave helps arc quenching. For DCCB arc quenching is difficult, since current zero is not existing naturally.