The ABB S283-C100 is a 3-pole miniature circuit breaker from the S280 series, rated for 100 A with a Trip Curve C characteristic, and mounts on a standard DIN rail inside a panel. The 100 A rating and Curve C mean this breaker handles moderate inrush currents typical of motor and transformer loads — the magnetic trip kicks in at 5 to 10 times rated current, so it won't nuisance-trip on startup but clears a hard fault fast.
Three poles mean it switches all phases in a three-phase circuit — common for feeding a sub-distribution board or a dedicated motor branch.