What this MCCB delivers on the line
The Siemens 3VA2463-7HN32-0AG0 is a SENTRON molded case circuit breaker rated for 630 A continuous current at 40 °C, with a 330 kA interrupting capacity at 240 V. That breaking capacity means it can clear a fault up to 330 kA without the arc re-striking or the case rupturing — essential for high-fault installations like transformer secondaries or large motor control centers where available fault current is substantial. The 3-pole design and ETU350 electronic trip unit give you adjustable long-time, short-time, instantaneous, and ground-fault protection curves, so selectivity with downstream breakers is achievable without sacrificing speed on hard faults. Rated insulation voltage Ui is 800 V, and the breaker carries a full thermal derating curve from 630 A at 40 °C down to 520 A at 70 °C — critical for panel builders who need to account for internal cabinet temperature rise without oversizing the frame. The auxiliary contact package (1 auxiliary switch + 1 trip alarm switch, HP version) provides status feedback to a PLC or annunciator, supporting full part genealogy tracking in a Tier-1 automotive line where every breaker trip must be logged for PPAP traceability.
Breaking capacity across voltage levels
This MCCB's interrupting capacity is voltage-dependent: 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 52.5 kA at 690 V. The steep drop at 690 V reflects the physics of arc extinction in air — at higher voltage the arc re-strikes more easily, so the breaker can only interrupt lower fault currents. For a 480 V panel (common in North America) the 242 kA rating at 440 V is the closest reference; at 600 V class you'd interpolate between the 500 V and 690 V figures. This is not a parametric match to the 5SQ2370-2YA01, which has a different trip curve and frame size — the 3VA2463-7HN32-0AG0 is a higher-current, higher-interrupting-capacity part that would not drop into a panel wired for the 5SQ2370 without a full coordination study.
Trip unit and auxiliary contacts
The ETU350 electronic trip unit provides adjustable long-time pickup (Ir), short-time pickup (Sd) and delay (tsd), instantaneous pickup (Ii), and ground-fault pickup (Ig) with time delay. The 1 auxiliary switch + 1 trip alarm switch (HP version) gives separate N/O and N/C contacts for status and alarm — the trip alarm closes only when the breaker trips on fault, not on manual open, which is useful for differentiating between a maintenance disconnect and a protective trip. No undervoltage release, no shunt trip, no communication module are fitted on this variant; those can be added via the accessory slots if needed.