The Siemens SENTRON 3VA2225-6JQ32-0DH0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying a continuous current of 250 A at 40 °C and an insulation voltage of 800 V. It uses an ETU560 electronic trip unit, includes an undervoltage release, and supports communication functions — meaning it can talk back to a control system for status and metering, not just trip on fault. Breaking capacity runs 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 6 kA at 690 V — enough headroom for most industrial distribution panels where you need selectivity downstream of a transformer.
The 250 A rating holds flat from 40 °C to 50 °C, then derates to 238 A at 55 °C, 225 A at 60 °C, 213 A at 65 °C, and 200 A at 70 °C. That's well above typical fault levels at a 240 V panelboard secondary, so you get solid coordination with downstream branch breakers. That means you can dial in the curve for a motor feeder or a distribution main without swapping the breaker body.
The supplied basic switch is 3VA2225-6JQ32-0AA0 — useful if you need a bare breaker without the undervoltage release.
That covers unheated warehouses and outdoor cabinets in most climates. Maximum power loss is 50.5 W — heat that has to be dissipated inside the enclosure. If you're packing several of these in a sealed box, factor that into your thermal calculation. No phase failure detection on this variant.