It belongs to the Construction line — a range built for commercial and light-industrial final distribution boards where space is tight and the spec must be met without over-engineering. The D characteristic means it tolerates the inrush of motor-driven loads (pumps, small conveyors, lifts) without nuisance tripping, while the type A residual-current element detects pulsating DC fault currents that a basic AC type would miss — essential on circuits feeding single-phase rectified loads like switching power supplies or VFDs.
The 1+N pole configuration switches the phase and switches the neutral, but does not break the neutral on overcurrent — it opens the neutral only on residual fault. That is standard for single-phase RCBOs in many markets, but if your local code requires full neutral isolation on overcurrent, confirm before wiring.
The Construction line shares the same module width as other 1+N RCBOs in the Siemens 5SU series — no special busbar or adapter needed. Wire termination is screw-clamp; strip length and torque follow the printed markings on the device side. The D characteristic curve and type A residual-current module are factory-sealed — no field adjustment.