The Siemens SENTRON 5SQ3670-1BA16 is a 4-pole miniature circuit breaker (3P+N) with a C tripping characteristic, rated 16 A at 400 V AC, 50 Hz. The IP20 finger-safe terminals are standard for enclosed distribution boards — no washdown rating here, so keep it inside the panel.
Rated 3 kA per EN 60898, this MCB handles typical residential and light commercial fault currents. In a sub-distribution board with a 3 kA prospective short-circuit current at the terminals, it clears faults within its energy-limiting class 3 — meaning it restricts let-through energy enough to protect downstream wiring and loads. For higher fault levels (e.g., 6 kA or 10 kA at the main panel), you'd need an upstream current-limiting device or a higher-rated breaker in the same SENTRON 5SQ family.
DIN-rail integration and footprint
The IP20 housing means no special sealing for the mounting cutout; just snap it on and bus the phases.