The ABB S801C-B100 is a 3-pole miniature circuit breaker from the S800C series, rated 100 A with a Trip Curve B characteristic. It mounts on a standard DIN rail and provides a 15 kA interrupting capacity at 230 VAC and 10 kA at 125 VDC — figures that govern its use in branch-circuit protection where high fault currents are possible.
Snaps onto a 35 mm DIN rail inside a control panel. The 3-pole format covers three-phase circuits; the Trip Curve B characteristic means it trips between 3 and 5 times rated current — suited for resistive or lightly inductive loads where inrush is low, not for motor starting.