Integrator note — SENTRON 5SQ2670-0KA05
The SENTRON 5SQ2670-0KA05 is a 4-pole miniature circuit breaker in a 3P+N configuration, meaning it switches all three phases and the neutral conductor — the neutral pole is switched, not just solid-linked. Rated 5 A with a C-curve tripping characteristic, it's sized for moderate inrush loads like small motor starters or lighting banks where the start-up surge sits between 5× and 10× the rated current. The 3 kA breaking capacity at 400 V AC (per EN 60898) covers standard distribution board fault levels; if your panel SCCR exceeds that, you'll need an upstream current-limiting device. The 55 mm installation depth and 3 width units (roughly 54 mm on a standard DIN rail) mean it fits the same cutout as other 4-pole SENTRON T55 breakers — no panel rework for a swap.
Panel integration and protection class
Rated IP20 — suitable for installation inside a closed distribution board or enclosure where no water ingress is expected. Energy limiting class 3 indicates it restricts let-through energy during a fault, which helps with downstream device coordination.