What the ratings mean for your panel
The Siemens 3VA1225-5GF42-0JH0 is a SENTRON molded case circuit breaker (MCCB) rated for 250 A continuous at 40 °C, with no derating needed up to 50 °C — above that it follows a published curve, dropping to 223 A at 70 °C. That 250 A frame sits in a 4-pole package (70 mm deep, 140 mm wide, 158 mm tall) designed for line protection in distribution panels, not motor-starting duty. The interrupting ratings are the headline: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, 30 kA at 500 V, and 17 kA at 690 V. For a 400 V industrial service, the 121 kA SCCR gives substantial headroom over typical available fault current, meaning this breaker can safely clear a bolted fault without upstream coordination failure.
Built-in accessories and trip functions
This variant ships with a shunt trip (STL) for remote opening and two auxiliary switches plus one trip-alarm switch (HQ configuration). The trip indicator and voltage trigger are present; undervoltage release and ground-fault monitoring are not. Communication function is absent — this is a standalone breaker, not a metering or networked unit. The rated insulation voltage is 800 V, and maximum power loss is 57 W at rated load.