The ABB S802U-K70 is a 2-pole K-curve MCB from the S800 series, rated at 70 A. It mounts on DIN rail for branch-circuit protection on motor and lighting loads. The 70 A rating places it in the middle of the S800 range, sized for sub-distribution boards or industrial panels feeding a group of smaller motors or a heavy lighting circuit. Two-pole configuration means it switches and protects both phase and neutral in single-phase applications, or two phases in three-phase systems where a dedicated neutral is not required.
What the K-curve rating means for the design
The K-curve magnetic trip characteristic sits between the C-curve and Z-curve. At 70 A, the S802U-K70 handles motor inrush without nuisance tripping.