Siemens 3VA2225-5JP42-0AG0 SENTRON MCCB, 250A 4P ETU550, 187

The Siemens 3VA2225-5JP42-0AG0 is a 4-pole SENTRON molded case circuit breaker rated 250 A at 40 °C, carrying a full 250 A up to 50 °C before derating begins — at 55 °C it still holds 238 A, and at 70 °C it delivers 200 A. That thermal curve means this breaker can live in a warm panel without stepping down a frame size. Breaking capacity hits 187 kA at 240 V, 121 kA at 415 V and 440 V, then 75.6 kA at 500 V, and 4.5 kA at 690 V. For a 250 A frame, those numbers give serious headroom on high-fault commercial and industrial services — you can coordinate downstream without worrying about the main letting through. The electronic trip unit is an ETU550, which gives you adjustable N-conductor protection (OFF or 20 % to 100 % of phase setting) plus a communication function for remote monitoring or integration into a power management system. A 1 AUX + 1 trip alarm HP auxiliary contact block is built in.