The Siemens 3VA2450-5JQ32-0LC0 is a 3-pole IEC frame 630 molded-case circuit breaker with a 55 kA breaking capacity at 415 V (class M). It carries an ETU560 electronic trip unit configured for LSIG protection — long-time (Ir adjustable 200–500 A), short-time (Isd 0.6–10x In), instantaneous (Ii 1.5–14x In), and ground-fault (Ig 0.2–1x In, tg 0.05–0.8 s). The 500 A continuous rating (In) and the LSIG suite make this breaker suited for main or feeder protection in low-voltage distribution where selectivity and ground-fault coordination are required.
The LSIG trip unit allows field adjustment of all protection parameters via the front face, so coordination studies can be implemented without swapping the trip unit.