What the ratings mean for your panel
The ABB S202MUC-K50 is a 2-pole miniature circuit breaker from the S200MUC series, rated 50 A with a K-curve trip characteristic. The K-curve trips magnetically between 8 and 12 times rated current — designed for inductive loads like motors, transformers, and solenoid valves where inrush current would nuisance-trip a B- or C-curve breaker. On a 277 VAC line it interrupts faults up to 6 kA; on a 500 VDC circuit it handles 10 kA, covering most industrial control panels and DC distribution. Snaps onto a standard DIN rail (35 mm) for quick panel integration — no tools needed for mounting, just a screwdriver for the terminals. The 2-pole form factor fits a single module width per pole, so it occupies two 18 mm slots in a distribution board.