Mersen MPDB69113 Power Distribution Block. Mersen Power Distribution Block, Large Open Style, Series: MPDB, 600 VAC, 760 A, 3 Pole, 2 Primary Connections/Pole, 12 Secondary Connection/Pole, 4 AWG to 500 kcmil, 14 to 4 AWG Wire, 100 kA Short Circuit, Polycarbonate, TiN Coated, Black, 7.89 in W x 5.7 in D x 4.75 in H Dimensions. Additional Description: MERS-MPDB69113 PWR DIS BLK AL LG 760A 3P 12 760A AL Large 3-Pole 2 - 12 500-#4 #4-#14 REPLACES 69113. Catalog Description: Open-Style PDB UL 1953 1000V 620A Tin-plated Aluminum - 760A 3-Pole 2 - 12 openings; 500-#4 --- #4-#14 Box to Box.