The ABB S803N-D63 is a 3-pole miniature circuit breaker from the S800N series, rated 63 A with a Trip Curve D characteristic at 230 V AC. Curve D provides a higher magnetic trip threshold (typically 10–20× In), making it suited for loads with high inrush currents — motor starters, transformers, or welding equipment — where a B or C curve would nuisance-trip on startup. The DIN-rail footprint drops into standard distribution panels or sub-distribution boards without adapters.
The closest functional peer is the S803S-D63, which shares the same 63 A rating, Trip Curve D, 3 poles, DIN-rail mounting, and 230 V AC voltage. The S803S variant carries a 50 kA interrupting rating versus the S803N's standard rating — a meaningful difference if the available fault current at the panel exceeds the S803N's capability. Both are current-production parts; the choice comes down to the required SCCR for the installation point.
Snap-on DIN-rail mounting for 35 mm rail per EN 60715. The 3-pole block occupies three modular units (17.5 mm per pole). Wire termination accepts copper conductors up to 35 mm²; torque settings for the terminal screws are specified on the side label. The S800N series uses a common busbar system for incoming feed — order the appropriate pin-and-sleeve busbar if paralleling multiple breakers in a group.