It's a 3+N-pole unit with a B-curve trip characteristic and a 6 A rated current — sized for protecting lighting circuits, socket outlets, or small motor loads in a commercial or light-industrial distribution board.
The B-curve means the magnetic trip operates at 3 to 5 times rated current (18–30 A for this 6 A unit), so it's suited for resistive or lightly inductive loads that don't draw a high inrush — think lighting banks, control transformers, or general-purpose socket circuits. The 3+N-pole configuration switches all three phases plus the neutral, giving full isolation on a three-phase circuit.
Snap-on mounting to standard DIN rail — fits alongside other Siemens 5SL6 series MCBs in a distribution board. The 3+N-pole module occupies four 18 mm width units, so plan for 72 mm of rail space plus any required busbar or comb-link clearance.