The Siemens 3VA1225-6EF42-0JH0 is a SENTRON molded case circuit breaker rated 250 A continuous at 40 °C, with a 220 kA interrupting capacity at 240 V — that's the SCCR you'd spec for a main feeder on a high-fault industrial service, not a branch device. The interrupting curve drops to 154 kA at 415 V, 75.6 kA at 440 V, 30 kA at 500 V, and 17 kA at 690 V (–) — so the real-world fault-clearing headroom stays high even on 480 V delta services. This is a line-protection design, meaning it's built for feeder duty rather than motor or generator protection — the trip curve and accessories are selected for cable and busbar protection. The 57 W maximum power loss is worth factoring into a sealed enclosure's thermal budget; at full load that's real heat to vent.
Auxiliaries and releases — what's on board
The shunt trip lets you remotely open the breaker via a control signal — standard for emergency-stop circuits or interlocked feeder schemes. The trip alarm switch gives a dedicated signal when the breaker trips on fault, separate from the aux contacts that follow the handle position.
Mounting and dimensions — fits the standard MCCB footprint
At 70 mm deep, 140 mm wide, and 158 mm tall, this breaker fits the standard 4-pole SENTRON 3VA frame size for the 250 A class. Panel cutout and busbar spacing follow the Siemens pattern — if your panel is already drilled for a 3VA1110 or 3VA1112 frame, the 3VA1225 is a different frame height and width, so it won't drop in without re-drilling the mounting holes or adjusting the busbar takeoff points. Verify the backplate layout before committing the BOM.