Curve K means the magnetic trip threshold is calibrated for inductive loads like motors and transformers — it holds through inrush without nuisance trips, unlike the sharper Curve C used for general-purpose circuits. The 16 A rating covers branch circuits feeding smaller motor groups or control transformers in a panel.
Panel Fit
Two poles occupy two module widths (approx. 36 mm). The K-curve magnetic trip (typically 8–12× In) lets it ride through the starting surge of a small motor or a transformer primary — useful in machine-tool or HVAC control panels where the load is inductive rather than resistive.