busbar system busbar center-to-center spacing 60 mm device adapter, width: 185 mm busbar thickness: 5.10 mm+TT profile for switchgear up to 630 A 3KA52/53, 3KL52/53 for 3VF4/5, additionally order 8US1927-4AF00 for 3VL1+DI, 3VL4, additionally order 8US1927-4AF01