IP2X finger protection means it's safe for open panel work, but it's not a washdown part; keep it inside a cabinet.
The AC-3 rating at 40 A covers most 15–18.5 kW motor loads at 400 V three-phase — that's the real-world current for starting and stopping a motor under load. AC-1 rating handles resistive loads up to the same current if you're switching heaters or lighting banks. The 1.5 ms non-overlap time between NC and NO contacts guarantees break-before-make, which matters for reversing or interlocking circuits where you can't let both coils energise at once.