ABB CT8/1200 (2CSG521200R1101) is a feed-through current transformer with a 1200 A primary and 5 A secondary at accuracy class 0.5 and overcurrent limiting factor FS 5. The window opening measures 80 x 30 mm to suit busbar or cable primaries, with a single primary input and plug-in secondary termination. Manufactured in Italy and classified under HS code 8544.42.