The Siemens 3VA2450-6JQ32-0KA0 is a 3-pole IEC frame 630 molded case circuit breaker in breaking capacity class H, rated Icu=85kA at 415V AC. It carries an ETU560 electronic trip unit configured for LSIG protection — long-time (Ir adjustable 200-500A), short-time (Isd 0.6-10x In), instantaneous (Ii 1.5-14x In), and ground-fault (Ig 0.2-1x In, tg 0.05-0.8s). The shunt trip (STL) operates on 220-250V DC or 208-277V AC. This is a line-protection breaker sized for a 500A continuous load (In=500A) with the overload pickup set via the ETU's rotary dials.
What the Ratings Mean for Fit
The 85kA Icu at 415V AC (breaking capacity class H) means this breaker can safely interrupt fault currents up to 85,000 A without failing — essential for high-fault locations like main switchboards or transformer secondaries. The ETU560 LSIG trip unit gives you full selectivity: you can coordinate the long-time pickup (Ir) anywhere from 200 to 500 A, and the short-time delay (tsd) lets you ride through downstream faults so only the closest breaker opens. The ground-fault element (Ig) is adjustable from 20% to 100% of In with a time delay of 0.05 to 0.8 seconds, making it suitable for equipment protection or, with the right setting, personnel protection in grounded systems. The shunt trip (STL) accepts either 220-250V DC or 208-277V AC control voltage — verify your control supply matches before wiring.
Where It Fits in the Panel
This is a 3-pole IEC frame 630 breaker — it mounts on a standard DIN rail or directly onto a mounting plate in a switchboard enclosure. The ETU560 display and pushbuttons are front-accessible for setting adjustments without removing the cover. The shunt trip occupies the accessory slot on the left side; a nut keeper kit is included for secure terminal fastening. For N-conductor protection, an external current transformer can be added (up to 160% of In). Plan for adequate bending radius on the incoming and outgoing cables — at 500A continuous, you are looking at paralleled conductors or large single cables.