What this 1.6 A C-curve MCB does on your panel
The Siemens 5SY3115-7 is a 1-pole SENTRON miniature circuit breaker rated at 1.6 A with a C tripping characteristic, meaning it's designed for moderate inrush loads like small motor starters, contactor coils, or control transformers where the startup surge is 5-10x the rated current. It breaks fault currents up to 4.5 kA per EN 60898 or 6 kA per IEC 60947-2 at 400 V AC — enough for most sub-distribution boards in commercial or light industrial panels. The 18 mm width (1 width unit) snaps onto a DIN rail via the quick-assembly system, and the combined top/bottom terminals accept solid or stranded conductors from 0.75 to 35 mm², so you can loop a feed-through without extra junction blocks.
Selectivity and coordination — where this C-curve sits
The C-curve trips magnetically between 5 and 10 times rated current, so at 1.6 A that's an instantaneous magnetic trip between 8 A and 16 A. That's higher than a B-curve (3-5x) but lower than a D-curve (10-20x), making this the right choice for circuits with moderate inrush — think a small contactor bank or a 24 VDC power supply. The 4.5 kA breaking capacity per EN 60898 governs the fault level the breaker can safely interrupt under that standard; the 6 kA per IEC 60947-2 applies when the breaker is used in industrial applications where the higher standard's testing criteria are required.
Mounting and wiring — fits standard 18 mm DIN-rail slot
The 18 mm width occupies exactly one 18 mm slot in a distribution board.