Siemens 5SY6006-6 is a SENTRON miniature circuit breaker, B-curve 6 A, 6 kA, 1+N-pole, 18 mm wide, DIN-rail mount, for residential and infrastructure branch-circuit protection.
The 6 A rating at 30 °C ambient derates to 5.76 A at 40 °C and 5.64 A at 45 °C, so if the panel runs hot, the load must be trimmed or you step up to the next frame. The 1+N-pole design switches both phase and neutral, with the neutral pole switching but not protecting. That's standard for single-phase final circuits where the neutral is opened with the phase. The neutral conductor switching feature means it's suitable for systems requiring disconnection of both poles.
One modular width unit at 18 mm — tight for a 1+N-pole in a crowded enclosure. Sealable and touch-protected — meets the requirements for lockout/tagout in residential and commercial panels.