What this breaker carries
The Siemens 3VA2463-5HN42-0DL0 is a 4-pole IEC frame 630 circuit breaker with a 55 kA breaking capacity at 415 V (class M). It uses an ETU350 trip unit configured for LSI protection — long-time (Ir adjustable 250–630 A), short-time (Isd 1.5–9× Ir), and instantaneous (Ii fixed at 9× In). The neutral conductor protection is adjustable: OFF, 50%, or 100% of phase current. The breaker ships with an undervoltage release rated 208–230 V AC 50/60 Hz, a nut keeper kit, two auxiliary switch changeover contacts (H), one trip alarm switch changeover, and one electrical alarm switch (HQ). This is a line-protection build — it's meant for main or feeder duty in a distribution panel, not motor branch circuit protection.
What the ratings mean for fit
The 55 kA Icu at 415 V places this in breaking capacity class M — it's sized for high-fault installations where upstream transformers or large motor groups can deliver substantial short-circuit current. The 630 A frame (In) with Ir adjustable down to 250 A means you can cable this for a 630 A bus but set the overload pickup to match a smaller downstream load, preserving selectivity headroom. The undervoltage release (208–230 V AC) drops the breaker if control voltage is lost — common in emergency-stop chains or mains-loss schemes. The auxiliary and alarm switches (2 changeover + 1 trip + 1 electrical alarm) provide status feedback to a PLC or SCADA. Verify the release coil voltage matches your control transformer before panel wiring.