This matters when wiring a 3-phase + N distribution board — the neutral pole is integral, not an add-on accessory.
Breaking capacity and durability — what the ratings mean
In a panel with a transformer secondary capable of 40 kA, this breaker won't hold — you'd step up to the 50 kA or 70 kA NSXm variant. Category A utilisation means it's not intended for current-limiting coordination with downstream breakers in a selective scheme — it trips instantaneously on short-circuit. Mechanical durability is 20,000 cycles; electrical durability is 20,000 cycles at rated current (In/2 at 440 V) and 10,000 cycles at full In. That's typical for a molded-case breaker in this class — enough for decades of occasional switching in a distribution panel, but not intended for frequent motor-starting duty where a contactor would handle the switching.
Connection is front-to-front: both line and load terminals on the front face, accepting compression lugs or busbars. The 35 mm connection pitch with spreaders (27 mm without) sets the busbar hole spacing. IP40 front-of-panel protection means it's splash-proof from the front but not sealed for washdown; IK07 impact rating handles light tool drops during panel assembly.