Siemens SENTRON 5SL3101-7MB — 1 A C-Curve Miniature Circuit Breaker
The Siemens 5SL3101-7MB is a SENTRON miniature circuit breaker rated 1 A with a C-tripping characteristic, 1-pole construction, and a breaking capacity of 4.5 kA per EN 60898 or 5 kA per IEC 60947-2 at 230/400 V AC.
The C-curve trips between 5 and 10 times rated current (5–10 A for this 1 A unit), which suits moderate inrush loads like small transformers or lighting banks where a B-curve would nuisance-trip but a D-curve would be too slow for conductor protection. The 4.5 kA (EN 60898) / 5 kA (IEC 60947-2) breaking capacity covers the vast majority of residential and commercial service-entrance fault levels in 230/400 V networks; if your prospective short-circuit current exceeds 5 kA at the panel, step up to a 6 kA or 10 kA rated sibling like the 5SL6120-7. Mechanical endurance is rated at 20 000 operating cycles typical — above the 10 000 cycles common on many compact MCBs, reflecting the SENTRON series' design for frequent switching in lighting or small motor-disconnect roles where the breaker doubles as a switch.
Snap-on DIN rail mount, 18 mm width (1 MW), 76 mm depth — fits standard distribution board cutouts. The IP20 rating (with conductors connected) means it is intended for enclosed panels, not outdoor or washdown locations. Halogen-free and silicon-free construction supports use in clean-room or high-reliability environments where outgassing must be minimized. The 50/60 Hz frequency range covers both 50 Hz European and 60 Hz North American / Middle Eastern grids, though the voltage ratings (230/400 V single-phase / multi-phase) align with IEC 60364 wiring rules.