For motor circuits or transformer primaries with higher inrush, a Curve C or K breaker would be the better call; Curve B is for circuits where you want nuisance-tripping protection against small overloads. Two poles let it switch both line and neutral on a 277 VAC single-phase circuit, or both legs of a 110 VDC supply.
Panel integration
Two-pole width is 36 mm — two module spaces. Wire termination is via tunnel terminals; strip length and torque follow the ABB S800 series installation guide. No auxiliary contact slot on this base unit, but the S800 range accepts plug-in accessories for alarm or shunt-trip if the application needs remote signaling.