e11-cbbp_f : centralized single-phase busbar protection for 12 bays e14-cbbp_f : centralized single-phase busbar protection for 16 bays e15-cbbp_f : centralized single-phase busbar protection for 20 bays e16-cbbp_f : centralized single-phase busbar protection for 24 bays   e33-cbbp_f : centralized three-phase busbar protection for 3 bays e34-cbbp_f : centralized three-phase busbar protection for 4 bays e35-cbbp_f : centralized three-phase