Mersen MPDB69133 Crab Joint. Mersen Power Distribution Block, Large Open Style, Series: MPDB, 600 VAC, 620 A, 3 Pole, 2 Primary Connections/Pole, 6 Secondary Connection/Pole, 6 AWG to 350 kcmil, 14 to 2/0 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-MPDB69133 MPDB Series UL 1953 1000V 500A - 620A AL Large 3-Pole 2 - 6 350-#6 2/0-#14. Catalog Description: Open-Style PDB UL 1953 1000V 500A Tin-plated Aluminum - 620A 3-Pole 2 - 6 openings; 350-#6 --- 2/0-#14 Box to Box.