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Lug Type: Mechanical # of Holes: 2 Size: 500 MCM Material: Aluminum Used For: 2/3-Pole 200A - 400A JD AND LD Frame Breaker. Wire Range: 3/0AWG - 500KCMIL (CU) 4/0AWG - 500KCMIL (AL) - 2 BARREL LUG.