Square D heavy duty Safety switches play a crucial role in today?s commercial and industrial settings, isolate power in daily activities, provide an effective way to interrupt power in an emergency, provide lockout on sight disconnect This Safety switch accessory is designed to be as field installes service Grounding lug kit used with 400 to 600A rated type DTU switches (series A) and it is required for Service equipment usage. Terminal data for this accesory is 2 wires AWG 6 to 250kcmil aluminium or copper.