The S802U-K100 is a 2-pole miniature circuit breaker from the ABB S800 series, rated 100 A at 240 VAC with a Trip Curve K characteristic. That 100 A continuous rating and 25 kA interrupting capacity mean it handles high-current branch circuits — think large motor starters, welder feeds, or main distribution panels — where fault currents can hit serious levels. The K curve is the key: it holds through moderate inrush (motors, transformers) but trips fast on a hard short, tighter than a D curve but looser than a C. For a 100 A motor load, that's the difference between nuisance trips on startup and actual protection.
Panel integration
Snaps onto standard DIN rail — no special mounting hardware needed. Two-pole footprint keeps panel space tight; at 100 A, the S800 series uses a wider module than the S200 line, so check your enclosure fill factor before committing the layout. Rated for 240 VAC, so it's a straight fit into North American 120/240 V split-phase or European 230/400 V distribution panels on the line-to-neutral leg.