The magnetic instantaneous short-circuit trip responds at 208 A. That is the threshold where the breaker opens on a hard fault without waiting for thermal overload — critical for limiting let-through energy to downstream contactors and cables. For a 16 A motor full-load current, 208 A is roughly 13x In, which is a typical magnetic-only setting for motor starting inrush (DOL start can pull 6–8x FLA for a few cycles). If your motor has a higher inrush or a soft-start profile, check coordination; this breaker is not adjustable. The 12 W typical power loss matters for enclosure thermal rise — in a sealed panel with multiple breakers, that heat adds up.
The S2 size footprint is 55 mm wide, 140 mm high, 149 mm deep. Clearance requirements: 50 mm above, 50 mm below, 30 mm to the side, 140 mm forward. No clearance needed behind the rail. Accepts 2x 0.75–25 mm² or 1x 0.75–35 mm² solid/stranded wire at the screw-type box terminals. Torque range 3–4.5 N·m. Mounting position any.