Three poles, no neutral pole switching, so it's a straight 3-phase line protection device for final circuits in residential or light commercial infrastructure panels.
The body takes 3 width units (54 mm wide, 90 mm tall, 76 mm deep; installation depth 70 mm). Conductor range 0.75 mm² to 25 mm² — that 25 mm² top end handles the feed-through busbar or a heavy downstream tail without needing a reducer. Sealable, with touch protection on the terminals. IP20 with conductors connected, which is standard for enclosed panel gear.
Energy limiting class 3 — it restricts let-through energy enough to protect downstream wiring and connected devices during a fault, which is the expected performance for a B-curve MCB in a residential or light commercial distribution board.