The ABB S281UC-K32 is a 1-pole miniature circuit breaker from the S280UC series, rated 32A with a K-trip curve for 250VDC applications. It's a current-production SKU — that's another line item you can spec without worrying about a last-time-buy notice tomorrow.
What the K-curve and DC rating mean for fit
The K-curve trips magnetically between 10x and 14x In (320A to 448A), designed for inductive loads like transformers, solenoids, and motor starters where inrush exceeds what a C-curve handles cleanly. The 250VDC rating means it interrupts a DC fault arc — AC breakers don't extinguish DC arcs reliably, so this is the correct part for DC bus feeds, battery banks, or DC power supplies in the panel.