The Siemens 3VA2463-5HN32-0KK0 is a 3-pole IEC frame 630 molded-case circuit breaker with a 55 kA breaking capacity at 415 V (class M). It carries the ETU350 electronic trip unit configured for LSI protection — long-time (Ir), short-time (Isd), and instantaneous (Ii) — with the rated continuous current In fixed at 630 A. Overload protection Ir is adjustable from 250 A to 630 A; short-circuit protection Isd spans 1.5 to 9 times Ir, and the instantaneous pickup Ii is fixed at 9 times In. The breaker ships with a left-side shunt trip rated for 208–277 V AC (50/60 Hz) and 220–250 V DC, plus one auxiliary switch.
What the Ratings Mean for Fit
The 55 kA Icu at 415 V places this breaker in the M (medium) breaking capacity class per IEC 60947-2. That rating means it can safely interrupt a fault current up to 55 kA without welding the contacts or rupturing the arc chamber — sufficient for most industrial panelboards fed from a transformer of 2000 kVA or less. The 630 A frame and adjustable Ir down to 250 A let it protect a wide range of feeders, busbars, or large motor loads; the LSI trip curve gives selective coordination with downstream breakers by setting the short-time delay (Isd) above the let-through of branch devices. The shunt trip (left-mounted, 208–277 V AC / 220–250 V DC) allows remote opening from an emergency-stop circuit or a PLC digital output. The auxiliary switch provides a status feedback contact for the control system — useful for monitoring breaker position in a remote I/O rack or safety PLC.