Polaris, IPCS7501, Piercing Insulation Connector, Dual Rated, Series: IPCS, Aluminum/Copper Conductor, 3/0 AWG to 750 kcmil Conductor, 600 V AC, Specifications: 55 A Copper, 40 A Aluminum, 90 deg C, Clamping Mounting, Fiber Reinforced Thermal Plastic, Black, 2.6 in L x 2.4 in W x 3.7 in H Dimensions