The Siemens 5SY6514-8CC is a 2-pole (1P+N) miniature circuit breaker from the SENTRON 5SY6CC series, rated 0.3 A at 230 V AC with a D tripping characteristic. D-curve means it handles high inrush currents — typical for motor, transformer, or lighting ballast loads — without nuisance tripping on startup.
Snap-on DIN-rail mount (quick assembly system), 36 mm wide (2 width units), 76 mm deep, fits standard 35 mm rail. Mounting position any, ambient -25 to +55 °C. Terminal accepts solid or stranded 0.75 to 35 mm², torque 2.5–3.5 N·m. Combined terminal top and bottom — same connector works for feed-through or busbar. Neutral conductor switching is built in (1P+N), so no separate neutral pole needed. IP20 with connected conductors — panelboard use only, not for wet locations.