The Siemens 3VA2225-6KP32-0JL0 is a SENTRON molded case circuit breaker rated for 250 A continuous current with a 242 kA interrupting capacity at 240 V. That interrupting rating means it can safely clear a fault up to 242,000 A at 240 V without welding contacts or rupturing the case — critical for high-fault panels near large transformers or motor control centers. At 415 V and 440 V it still holds 187 kA, and at 690 V it drops to 6 kA, so the voltage you're protecting determines the available fault current it can handle.
What the ratings mean for fit
The 250 A rating at 40 °C is the continuous current it can carry without tripping. Derate it as the ambient climbs: still 250 A at 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 runs hot — say next to a drive stack or in a non-conditioned enclosure — that 200 A at 70 °C is the number to spec against, not the nameplate 250 A. The ETU850 electronic trip unit gives you communication and measurement functions — voltage trigger and other measurement functions are built in. That means this breaker can talk to a BMS or PLC about what it's seeing, not just trip. The shunt trip (STL) auxiliary release lets you remotely open the breaker via a control signal, which is handy for emergency stops or sequenced shutdowns. Physical fit: 105 mm wide × 181 mm tall × 86 mm deep. That width matters in a multi-breaker lineup — three of these side by side eat 315 mm of DIN-rail or panel-mount space. The 86 mm depth includes the case body; make sure your gland plate or enclosure door clears it, especially if you're adding the auxiliary switch block or shunt trip wiring.
The auxiliary contact configuration ships as 2 auxiliary switches plus 1 trip alarm switch plus 1 electrical alarm switch HQ. That's a full complement for status feedback — breaker open/closed, trip event, and electrical alarm. The basic switch is order code 3VA2225-6KP32-0AA0 and the integrated auxiliary trip is 3VA9688-0BL32, so if you're stocking spares, those are the sub-assemblies to hold. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The storage limit governs shipping and warehousing — it'll survive a cold warehouse or a hot truck, but the operating range is what matters in the panel. Maximum power loss is 48 W, so factor that into your enclosure thermal calculations if you're packing several breakers in a sealed box.