What the ratings mean for your panel
The Siemens SENTRON 3VA2225-5HL42-0BA0 is a 4-pole molded case circuit breaker (MCCB) rated for a continuous current of 250 A, with an ETU320 electronic trip unit. Its interrupting capacity hits 187 kA at 240 V AC — that's enough to clear a high-fault bolted short without the arc flashing over to adjacent gear. At 415 V and 440 V it still holds 121 kA, dropping to 79 kA at 500 V and 5.1 kA at 690 V. The rated insulation voltage is 800 V, so it's comfortable on 690 V line-to-line systems. The ETU320 is a basic adjustable thermal-magnetic replacement — you get fixed pickup and time-delay curves, no communications or ground-fault module. An undervoltage release (UVR) is integrated as standard (order code for the release sub-assembly is 3VA9608-0BB11). Thermal derating is published for the full range: 250 A continuous up to 50 °C ambient, then 241 A at 55 °C, 232 A at 60 °C, 222 A at 65 °C, and 213 A at 70 °C. If your panel ambient runs above 50 °C, size the load accordingly. Operating temperature span is -25 to 70 °C; storage from -40 to 80 °C. Power dissipation maxes at 50.5 W — that's modest for a 250 A frame, so ventilation in a standard IP54 enclosure is usually adequate. Mechanical endurance is rated at 20,000 operations. No auxiliary contact or shunt trip is fitted as standard; the UVR is the only integrated release.
Panel fit and mounting
Footprint: 140 mm wide, 181 mm tall, 86 mm deep. That's a standard 4-pole MCCB form factor for a 250 A frame — it will bolt directly onto a mounting plate or DIN-rail adapter (the SENTRON 3VA range uses a common screw-fix pattern). The depth of 86 mm means it clears a 120 mm deep enclosure with room for rear-connected busbars. Verify the busbar system is rated for the 250 A continuous current and the prospective fault level at the point of installation.