What it is and what it does
The Siemens SENTRON 3VA2225-5JP32-0AD0 is a 3-pole molded case circuit breaker (MCCB) rated for 250 A continuous current, designed for line protection in distribution panels. It carries a 187 kA interrupting capacity at 240 V, dropping to 121 kA at 415 V and 440 V, then 75.6 kA at 500 V, and 4.5 kA at 690 V — that SCCR curve tells you where this breaker has headroom and where it doesn't. At 690 V you're into the low end, so verify the available fault current before committing it to a 690 V bus.
Thermal derating and real-world current
The 250 A rating holds flat from 40 °C through 50 °C. Above that it steps down: 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 runs hot — say a sealed enclosure next to a furnace line — that 200 A at 70 °C is the number you spec to, not the nameplate 250 A. Max power loss is 48 W, which matters for enclosure heat calculations.
Physical fit and panel integration
Dimensions are 105 mm wide, 181 mm tall, 86 mm deep — standard MCCB footprint for this class. Three-pole construction. No undervoltage release, no ground-fault monitoring on this variant. Operating temperature range is -25 °C to 70 °C; storage from -40 °C to 80 °C. If you're swapping into an existing panel, check the busbar spacing and the auxiliary switch wiring — this one ships with three HQ aux switches pre-installed.