100kA Short Circuit Current Rated Power Distribution Block. 2 x 500 MCM-4 AWG Line, 4 x 4/0-6 AWG Load Power Distribution Blocks are made of Valox Nylon 6/6, Finger Safe Lexan 500R Polycarbonate Panels and Covers, high-conductivity 6061-T6 Electro-Tin Plated aluminum alloy connector. Each block can