What the interrupting rating means for the panel
The 1SDA068170R1: Iu 160 A is the continuous current the XT2H frame carries without tripping — sized for a 160 A feeder or a downstream panel main.
Breaking part — not a complete MCCB
This is the removable breaking part (interrupting module) for the ABB XT2H 160 frame, not a complete molded-case breaker with a case and terminals. It mates with the XT2 fixed part or base — the two-piece design lets you swap the trip unit without pulling the line and load conductors. On a line-down spare, stock the breaking part only if the base is already in place; otherwise order the complete MCCB. The XT2H designation means the high-breaking-capacity variant of the XT2 frame — the 'H' suffix typically delivers 70 kA Icu at 415 V versus the standard 'B' or 'N' grades. For a panel with a high available fault current, the H-grade avoids a series-rated combination that forces selectivity headaches upstream.