What the key ratings mean for your panel
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. At 415 V, that 154 kA SCCR lets it sit ahead of a transformer or a large motor control center without needing a current-limiting fuse upstream — it clears bolted faults at that level without cascading to the main breaker. It is fitted with a TM240 thermal-magnetic release and an undervoltage release (UVR) as the auxiliary release design. No auxiliary contacts, no communication module, no ground-fault or phase-failure detection — this is a straight line-protection breaker for feeder duty, not a multifunction power monitor.
Sourcing and lifecycle reality
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.
Panel integration and footprint
The breaker measures 140 mm wide by 158 mm high by 70 mm deep. The 70 mm depth is shallow enough for standard 200 mm deep enclosures with the door closed; the 140 mm width occupies three 45 mm DIN-rail module positions if using an adapter plate, or direct screw-mount on the back panel. 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. The integrated auxiliary trip order code is 3VA9608-0BB25 if you are adding shunt-trip capability downstream.
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.