EATON Cutler-Hammer Series Main Breaker Lug Kit, 300 A, 10 kA Interrupt Rating, 2 AWG to 300 kcmil Copper/Aluminum at 60 or 75 deg C, For Use With: Type BW/CSR Circuit Breaker and Type CH/CSR 3/4 in Loadcenter, 1.1 in L x 1.1 in W x 1.1 in H