The ABB S803C-D16 is a 3-pole miniature circuit breaker from the S800C series, rated 16 A with a Trip Curve D characteristic. It mounts on a standard DIN rail and is rated for 230 VAC with a 15 kA interrupting capacity — the AC fault-clearing figure that governs its use in distribution panels where high inrush loads like motor starters or transformers are present. The DC interrupting rating is 10 kA.
What the ratings mean for fit
Trip Curve D means the magnetic trip threshold is set to 10–20× In (160–320 A instantaneous), which avoids nuisance tripping on high inrush currents from motor starting, transformer energization, or capacitive loads. This makes the S803C-D16 a fit for motor branch circuits and industrial equipment with inductive kick, not for general lighting or resistive loads where a B or C curve would be more appropriate. The 15 kA interrupting capacity at 230 VAC means it can safely clear a bolted fault up to that level without welding contacts or cascading failure upstream — a key number for the panel designer verifying SCCR coordination.