The 5SQ2160-0KA13: The B-curve trips between 3 and 5 times rated current (roughly 39–65 A magnetic trip threshold), so it's sized for resistive and general-purpose loads where you don't expect high inrush — lighting circuits, control transformers, small power supplies.
Snap-on DIN rail mount, 55 mm installation depth. The single-pole body leaves room for adjacent breakers in a multi-pole assembly; the busbar comb bridges across the line side. AC/DC rated supply, but the 50 Hz frequency rating governs the thermal-magnetic response timing — don't use on a DC circuit without verifying the trip curve holds.