The Siemens SENTRON 3VA1225-6EF42-0DA0 is a 4-pole molded case circuit breaker (MCCB) rated for 250 A continuous current (Iu) at up to 50 °C ambient — meaning it carries a full 250 A load without derating in a typical 40 °C panel environment, and only begins to taper at 55 °C (243.3 A) down to 223 A at 70 °C. That thermal curve gives you headroom for lightly ventilated enclosures or high-ambient furnace rooms. The interrupting ratings are what make this breaker a primary-selectivity candidate: 220 kA at 240 V, 154 kA at 415 V, 36 kA at 440 V, and 17 kA at 690 V.
For a BOM freeze or critical-spare holding, the key documentation to request at quote time is the device manual (the 3VA molded case circuit breaker manual, referenced in the short-circuit protection design note) and the UL/CSA/IEC compliance certificates. The part carries no integrated communication or auxiliary contact block — if your panel requires those, they must be ordered separately as add-on accessories.
The breaker measures 140 mm wide by 158 mm high by 70 mm deep. Front face is IP40 rated — suitable for general indoor panel use, not washdown. No N-conductor protection is included — this is a 3-pole-plus-neutral breaker where the neutral is switched but not protected. If you need a fully protected neutral, this variant is not the one.
Comparison with a smaller-frame sibling
The closest functional peer in the SENTRON family is the 3VA1112-5EF32-0CA0, which is a 3-pole, 125 A frame with a lower interrupting capacity. The 3VA1225-6EF42-0DA0 is the 4-pole, 250 A version with the TM240 release — it is physically wider (140 mm vs 105 mm for the 3-pole 125 A frame) and requires a larger enclosure cutout. If your BOM was specified around the 3VA1112-5EF32-0CA0, you cannot simply swap in this 250 A unit without reworking the bus bars and enclosure depth; the footprint and lug sizes differ. The 3VA1225-6EF42-0DA0 is the correct part when the load exceeds 125 A or when you need the 4-pole switching with the higher SCCR at 415 V.