What the ratings mean for fit
The Siemens 3VA2225-5JQ42-0HD0 is a 4-pole IEC molded-case circuit breaker in the 3VA2 frame, rated In=250A with an Icu of 55 kA at 415 V AC — that is the maximum short-circuit current it can safely interrupt at that voltage, which determines whether it coordinates with upstream gear in a fault scenario. The ETU560 electronic trip unit provides LSIG protection (long-time, short-time, instantaneous, ground-fault), with overload pickup adjustable from 100 A to 250 A and short-time pickup from 0.6 to 10× In. Ground-fault protection is switchable, with pickup from 0.2 to 1× In and time delay 0.05 to 0.8 s, so it can be tuned to coordinate with downstream feeders without nuisance tripping on inrush.
Deployment context
This breaker mounts in a standard panel or enclosure on a DIN rail or bolted bus — the 3VA2 frame is sized for switchboard and distribution panel integration, not for snap-on DIN rail alone. The integrated shunt trip (left-side, 24 V AC 50/60 Hz / 24-30 V DC) allows remote tripping from a safety circuit or emergency-stop chain, which is common in machine-tool and conveyor-line panels where the breaker doubles as a disconnect under the local code.