The Siemens 3VA1225-5EF32-0AH0 is a SENTRON molded case circuit breaker (MCCB) sized for 250 A continuous duty, with a TM240 thermal-magnetic release. Three poles, line protection version — no undervoltage release, no ground-fault monitoring, no communication module. This is a straightforward overcurrent-only breaker for distribution or feeder duty.
Breaking capacity and thermal curve
Rated breaking capacity hits 187 kA at 240 V, 121 kA at 415 V, 36 kA at 440 V, and 17 kA at 690 V. That 187 kA figure at 240 V puts this in the high-interrupting category for low-voltage distribution — useful where fault current is stiff, like near a large transformer secondary. The thermal-magnetic release holds 250 A flat from 40 °C through 50 °C, then derates to 243.3 A at 55 °C, 236.5 A at 60 °C, 229 A at 65 °C, and 223 A at 70 °C. If the panel ambient runs above 50 °C, size the load side accordingly.
Physical fit and auxiliary contacts
Dimensions: 105 mm wide, 158 mm tall, 70 mm deep. That 105 mm width is the standard 3-pole MCCB footprint for this SENTRON frame size — it bolts into the same mounting pattern as other 3VA breakers in the 250 A class. The auxiliary contact block is factory-fitted: 2 auxiliary switches plus 1 trip alarm switch (HQ type). No separate aux kit to order. Front IP40 protection — suitable for enclosed panel mounting, not for washdown areas.