Siemens 5SJ6313-6 — 3-pole B-curve MCB at 13 A, 6 kA
The Siemens SENTRON 5SJ6313-6 is a 3-pole miniature circuit breaker rated 13 A with a B tripping characteristic, designed for 400 V AC systems and a 6 kA breaking capacity per EN 60898 and IEC 60947-2.
The 13 A rating governs the continuous load this MCB can carry without tripping — sized for a 13 A branch circuit, not for motor starting or high-inrush loads. The B-curve means magnetic trip occurs at 3–5× In (39–65 A), so it tolerates modest inrush but will nuisance-trip on transformer or motor starts; for those loads, a C- or D-curve is the better call. The 3-pole construction switches all three phases simultaneously, required for three-phase branch circuits. The 440 V insulation voltage and overvoltage category 3 confirm it is rated for fixed-installation mains distribution.
The 70 mm installation depth and 3 width units match the SENTRON enclosure grid — verify fill factor against the distribution board layout. Touch protection is built in.