What this breaker is and where it fits
The Siemens 3VA2463-5JP32-0KK0 is an IEC frame 630 molded-case circuit breaker in the 3VA2 series, breaking capacity class M, with a rated ultimate short-circuit breaking capacity Icu of 55 kA at 415 V AC. It is a 3-pole unit configured for line (cable/feeder) protection, fitted with an ETU550 electronic trip unit set for LSI protection — long-time (Ir adjustable 250 A to 630 A), short-time (Isd 0.6–9× In), and instantaneous (Ii 1.5–9× In). The breaker ships with a shunt trip accessory wired left-side, rated 208–277 V AC 50/60 Hz and 220–250 V DC, plus one auxiliary contact. This is a panel-mount device sized for main or large feeder duty in switchboards, MCCs, and distribution enclosures.
What the key ratings mean for your spec
The 55 kA Icu at 415 V is the maximum fault current the breaker can interrupt once without needing replacement — critical for verifying SCCR coordination with upstream gear. The ETU550 LSI trip unit gives you field-adjustable long-time pickup (Ir) from 250 A to 630 A, so a single frame covers a wide cable/load range. Short-time (Isd) and instantaneous (Ii) settings let you achieve selective coordination with downstream breakers: Isd delay can be tuned to ride through motor inrush, while Ii provides fast clearing for bolted faults. The shunt trip on the left side accepts either AC (208–277 V) or DC (220–250 V) control voltage, making it suitable for remote-trip schemes from a safety PLC or E-stop circuit.