The ABB S282UC-B10 is a 2-pole molded case circuit breaker from the S280UC series, rated 10A with a B-curve trip characteristic for 500VDC systems. This is the exact part number for a DC-rated branch circuit protection device, built for industrial DC distribution — think PV combiner boxes, battery banks, or DC bus feeders where a standard AC breaker won't hold the arc.
The B-curve at 10A means the magnetic trip engages between 3x and 5x rated current — 30A to 50A — so it clears moderate overloads fast while riding out motor inrush or capacitor charging current that a C-curve would nuisance-trip. At 500VDC, the arc-extinction chamber is designed for DC commutation, which is the real differentiator here: DC arcs don't have a natural zero-crossing, so the breaker's internal de-ion plates and blow-out magnets have to stretch and quench the arc. This part handles that. If you're feeding a 500VDC bus from a solar array string combiner, this is sized for the job.