Siemens SENTRON 5SQ2170-0KA06 — 1-pole C-curve MCB, 6 A, 3 kA
The 6 A rated current and C-curve define the continuous load and short-circuit protection threshold: the breaker carries 6 A indefinitely and trips magnetically between 30 A and 60 A for fast fault clearing. Overvoltage category 3 and pollution degree 3 mean it is rated for fixed installations within building distribution panels, not for outdoor or wet locations. The 1-pole form factor occupies a single width unit on a DIN rail, so it fits standard 18 mm module spacing. The 55 mm installation depth is shallow enough for compact enclosures without deep gland plates. IP20 protection means it is touch-safe but not sealed against moisture — suitable for indoor panel mounting only. The AC/DC voltage type allows use on either AC or DC control circuits, though the 3 kA breaking capacity is specified at 240 V AC per EN 60898.
Deployment context
Snap-on DIN-rail mounting for distribution boards and sub-distribution panels. The single-pole C-curve MCB is a standard building block for final sub-circuits in lighting, socket-outlet, and small-load protection schemes.