On the DC side, it's rated 125 V with 10 kA interrupting capacity, so it handles battery-backed control circuits or DC bus protection in the same panel. The 1-pole format means it breaks only the line conductor; for a single-phase branch circuit that's all you need. At 25 A it covers a solid range of lighting sub-feeds, small pump motors, or control transformer primaries.
DIN-rail mounted, single module width. In a distribution board or control panel, it occupies one 18 mm slot. The S800C series shares the same footprint as the broader ABB MCB family, so if you're swapping into an existing panel that was built around S200 series breakers, the rail spacing and busbar pitch are identical — no re-drilling or adapter plates. Terminal capacity accepts standard copper conductors up to 25 mm², which is adequate for the 25 A rating without oversizing the lug.