What this MCCB carries
The Siemens 3VA1163-3ED42-0AA0-ZD00 is a 4-pole IEC frame 160 molded-case circuit breaker with a 63 A fixed thermal-magnetic trip unit (TM210, FTFM). Its interrupting rating is 25 kA at 415 V AC (breaking capacity class N), which means it can safely clear a fault up to that level on a 400 V distribution bus without needing an upstream current-limiting fuse. The short-circuit protection is fixed at 10 × In (630 A magnetic pickup), so it's sized for general cable and light motor protection — not for high-inrush transformer or heavy motor starting where a higher Ii setting would be needed.
What the N conductor unprotected means
The description flags N conductor unprotected — the neutral pole on this 4-pole breaker is a switched-only pole (no overcurrent protection). That's standard for most 3-phase + N distribution where the neutral is not expected to carry fault current. If your panel design requires a fully protected neutral (TN-C systems, high-harmonic loads), this isn't the variant you want.