Power Distribution Blocks: Block Type - Power Distribution; Poles Per Block - 3; Openings Per Pole, Primary - 2; Conductor Size - Primary - 500-4; Openings Per Pole, Secondary - 2; Conductor Size - Secondary - 3/8"-16 x 1-5/16"; Conductor Material - CU/AL; Material - Housing - Phenolic; Material - Connector - Aluminum; Rating - Voltage - 600V; Rating - Amps - 760; Optional Cover - CC145-3; Manufacturer Series - 145