The Siemens SENTRON 5SJ4101-7HG40 is a 1-pole miniature circuit breaker (MCB) from the 5SJ4 series, designed for branch-circuit overcurrent protection in final distribution boards. The 10 kA breaking capacity per EN 60898 covers residential and light commercial panels; the 15 kA rating per IEC 60947-2 extends its reach into industrial sub-distribution where higher prospective fault currents are expected. At 400 V AC rated voltage, it handles line-to-neutral faults in 230/400 V systems cleanly.
Snaps onto standard 35 mm DIN rail (EN 60715) and occupies a single modular width (18 mm). The 70 mm depth means it sits flush with the rail profile — no extra clearance needed behind the panel door beyond the standard 70 mm backspace. Combined top and bottom tunnel terminals accept Cu conductors; tighten to 3.5 Nm. Any mounting position is allowed, which helps when you're packing a dense panel.