The 5SL4314-7CC: The 10 kA breaking capacity at 400 V means this MCB can safely interrupt fault currents up to 10,000 A without welding its contacts or cascading failure upstream — sufficient for most commercial and light industrial distribution boards where the prospective short-circuit current stays under that threshold. At 0.3 A it protects a very lightly loaded circuit — a control transformer primary, a PLC power supply input, or an instrumentation loop — not a general-purpose lighting or socket circuit. The 3-pole construction switches all three phases simultaneously, which matters for three-phase control circuits or small motor feeds where single-phasing must be avoided.
Integration note
Single-piece packaging, one unit per order line. The 3-pole footprint occupies three DIN-rail module widths (about 54 mm). For panel builders: the C-curve at 0.3 A means the magnetic trip threshold is roughly 1.5–3 A instantaneous — verify that the downstream load's inrush does not exceed this on a cold start, or nuisance tripping will occur. The 10 kA SCCR at 400 V matches the typical fault level at the sub-distribution board; if the main breaker upstream is rated higher, verify coordination.