Mersen MPDB67413 Power Distribution Block. Mersen Power Distribution Block, Intermediate Open Style, Series: MPDB, 600 VAC, 380 A, 3 Pole, 1 Primary Connections/Pole, 1 Secondary Connection/Pole, 4 AWG to 500 kcmil Wire, 100 kA Short Circuit, Polycarbonate, TiN Coated, Black, 5.28 in W x 5 in D x 3.25 in H Dimensions. Additional Description: MERS-MPDB67413 MPDB Series UL 1953 1000V 310A - 380A AL INT 3-Pole 1 - 4 500-#4 2/0-#14. Catalog Description: Open-Style PDB UL 1953 1000V 310A Tin-plated Aluminum - 380A 3-Pole 1 - 4 openings; 500-#4 --- 2/0-#14 Box to Box.