The part occupies a single 18 mm width unit on standard DIN rail, so it fits a typical distribution board slot without crowding. The B-curve is the right choice for general-purpose socket circuits and lighting where inrush is low; if the load includes motors or transformers with higher starting surges, the C-curve sibling (5SY6020-7KL) would be the better call to avoid nuisance tripping.
The 18 mm width (1 MW) and 76 mm depth leave room for adjacent breakers and wiring ducts in a typical enclosure. The screw terminals accept the tightening torque range of 17.7 to 22.1 lbf·in — a standard electrician's screwdriver setting, no special tooling needed.