Power Distribution Blocks: Block Type - Power Distribution; Poles Per Block - 3; Openings Per Pole, Primary - 1; Conductor Size - Primary - 3/8-16 x 1-3/8"; Openings Per Pole, Secondary - 1; Conductor Size - Secondary - 1/4-20 x 1-3/8"; Conductor Material - CU; Material - Housing - Phenolic; Material - Connector - Copper; Rating - Voltage - 600V; Rating - Amps - 230; Optional Cover - CC143-3