What this 4-pole B-curve MCB does in the panel
The Siemens SENTRON 5SJ6416-6 is a 4-pole miniature circuit breaker rated for 16 A at 400 V AC, with a B tripping characteristic that trips between 3 and 5 times rated current — the standard choice for resistive and general-purpose loads where nuisance tripping from inrush is unlikely. Its 6 kA breaking capacity per EN 60898 (also rated 6 kA per IEC 60947-2) means it can safely interrupt a fault current up to that level on a 400 V three-phase supply, which covers most commercial and light industrial sub-distribution boards. Lifecycle stage is current; this is the active catalog number for new builds and spares.
Terminal capacity and wiring constraints
Environmental and compliance specs that matter for spares holding
Rated insulation voltage is 440 V AC, overvoltage category 3. Mechanical service life is 20,000 switching cycles typical.
The 5SJ6416-6 is the 4-pole version of the same 16 A B-curve breaker. The 2-pole sibling 5SJ6216-6 shares the same current rating, breaking capacity, tripping characteristic, terminal range, and environmental specs — the only difference is pole count and width (2 width units vs 4). If a panel was specified around the 2-pole variant, the 4-pole will drop into the same DIN rail but occupies double the width and requires the neutral and L3 connections to be wired. No rewiring of the existing 2-pole circuit is possible without adding the extra poles.