The Siemens 5SP4140-7 is a 1-pole SENTRON miniature circuit breaker (MCB) from the 5SP4 series, rated 40 A with a C tripping characteristic. The C-curve (5–10× In) is the standard choice for moderate inrush loads like small motors, pumps, and lighting banks — it holds through the startup surge without nuisance tripping on a circuit that draws 40 A continuous. The breaking capacity is 10 kA per EN 60898 and 20 kA per IEC 60947-2; the higher IEC figure matters if the panel is specified to the industrial standard rather than the household installation standard, giving more fault-current headroom in a commercial or light-industrial distribution board. Rated at 400 V AC, this single-pole breaker fits a 230/400 V single-phase branch circuit. The 70 mm installation depth is standard for the 5SP4 family, so it drops into any DIN-rail enclosure that accepts modular 1.5-width-unit devices.
Panel integration
Snap-on DIN-rail mount, 1.5 width units.