What this MCCB carries and what it means for your panel
The Siemens 3VA2225-6JP32-0AH0 is a SENTRON 3VA2 molded case circuit breaker rated for a continuous current Iu of 250 A, with a rated insulation voltage Ui of 800 V. The headline breaking capacity is 242 kA at 240 V AC, stepping down to 187 kA at 415 V and 440 V, 121 kA at 500 V, and 6 kA at 690 V — that 242 kA figure at 240 V tells you this breaker is sized for high-fault utility or transformer-fed secondary panels where the available fault current is extreme, not for a typical 480 V distribution board where the 187 kA at 415 V is the relevant number. It is the line protection version, meaning the ETU550 electronic trip unit is configured for cable and busbar protection rather than motor or generator protection — no phase-failure detection, no undervoltage release, no ground-fault monitoring. The trip unit is field-configurable, but the base order code ships without auxiliary releases. Thermal derating is published across the operating range: full 250 A up to 50 °C, then 238 A at 55 °C, 225 A at 60 °C, 213 A at 65 °C, and 200 A at 70 °C (–). If your panel ambient inside the enclosure hits 55 °C, you lose 12 A of headroom — plan the load accordingly.
Physical fit and panel integration
Dimensions are 105 mm wide, 181 mm high, 86 mm deep. The 105 mm width is the standard 3-pole MCCB footprint for this class. Front protection is IP40 — suitable for a clean indoor panel, not for washdown or outdoor exposure. The auxiliary contact configuration ships as 2 auxiliary switches plus 1 trip alarm switch (HQ variant), which gives you one NO+NC for status feedback and a separate alarm contact that changes state only on a trip event, not on manual switching.