Trip Curve B means the magnetic trip fires at 3 to 5 times rated current (96–160 A for this 32 A unit). That's the standard choice for resistive loads and general-purpose lighting circuits where inrush stays low. If you're protecting motor feeders or transformer primaries with higher inrush, Curve C or D would be a better match — Curve B will nuisance-trip on those. That's typical for a downstream distribution board fed from a transformer with moderate impedance.
Panel integration
The 3-pole body takes up three module widths (about 54 mm). No special air-gap or derating required at 40 °C ambient for this load level, but if you're packing it into a fully loaded enclosure, check the thermal de-rating table for the specific enclosure size.