This current transformer, tropicalised for busbar, has a line rated current of 3000 A and a secondary current rating of 5 A.This current transformer do have a 55 mm x 128 mm opening.Compatible with a single output for bar: 127 mm x 52 mm.Burden and accuracy class as follows: class 0.5 maximum power: 30 VA, class 1 maximum power: 50 VA.