Mersen MPDB900061 Power Distribution Block. Mersen Power Distribution Block, Double Wide Large Open Style, Series: MPDB, 600 VAC, 1140 A, 1 Pole, 3 Primary Connections/Pole, 8 Secondary Connection/Pole, 4 AWG to 500 kcmil Wire, 100 kA Short Circuit, Polycarbonate, Black, 5.31 in W x 5.7 in D x 3.55 in H Dimensions. Additional Description: MERS-MPDB900061 (N) PWR DIS BLK AL LG 1140A DW 8 1140A AL Doublewide 1-Pole 3 - 8 500-#4 2/0-#14. Catalog Description: Open-Style PDB UL 1953 1000V 930A Tin-plated Aluminum - 1140A 1-Pole 3 - 8 openings; 500-#4 --- 2/0-#14 Box to Box.