What this MCCB carries
The Siemens SENTRON 3VA2225-6JQ32-0JL0 is a 3-pole molded case circuit breaker (MCCB) rated for 250 A continuous current at 40 °C ambient. Its ETU560 electronic trip unit provides adjustable overload and short-circuit protection curves, plus ground fault monitoring via summation current formation on the L-conductor. The 242 kA breaking capacity at 240 V means it can safely interrupt very high fault currents without cascading upstream — sized for large transformer secondaries or busway feeds. This version ships with a shunt trip release (STL) for remote tripping, two auxiliary switches, one trip alarm switch, and one electrical alarm switch (HQ configuration). The integrated auxiliary trip is order code 3VA9688-0BL32; the supplied basic switch is 3VA2225-6JQ32-0AA0. Communication function is onboard, though the protocol isn't specified in this listing — expect it to interface with a SENTRON communication module via the accessory slot.
Thermal derating and panel fit
The 250 A rating holds flat from 40 °C through 50 °C. Above that, derate linearly: 238 A at 55 °C, 225 A at 60 °C, 213 A at 65 °C, and 200 A at 70 °C — the maximum operating temperature. In a sealed enclosure with other heat sources, expect to use the 60 °C column (225 A) for a realistic continuous load. Maximum power loss is 48 W, which factors into enclosure thermal calculations. Dimensions are 181 mm high × 105 mm wide × 86 mm deep. Rated insulation voltage is 800 V.
Breaking capacity by voltage
Breaking capacity varies significantly with system voltage: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 6 kA at 690 V. The 690 V figure drops sharply — this MCCB is optimized for low-voltage distribution up to 500 V. On a 690 V system, verify the available fault current stays under 6 kA, or step up to a higher-rated frame.
Environmental and storage limits
Storage range is -40 °C to 80 °C, wider than the operating range of -25 °C to 70 °C. The storage maximum governs handling and warehousing, not running conditions. Trip indicator and voltage trigger are both present, aiding fault diagnosis without opening the panel.