For a 415 V distribution board with a high prospective fault level (say, close to a transformer), that 85 kA rating means you do not need an upstream current-limiting fuse or a larger-frame breaker to achieve selectivity. Rated In=800 A, with overload protection (Ir) adjustable from 320 A to 800 A and short-circuit protection (Ii) from 1.5 to 12 times In. The LI curve (long-time and instantaneous) is the standard for line protection on cables and busbars; no short-time delay means it clears hard faults fast.
What comes on the breaker
The 3VA2 frame accepts standard Siemens plug-in accessories (shunt trip, undervoltage release, motor operator) if you need remote opening or closing later.