Interrupting ratings that define the bus
The 3VA1225-5EF32-0AG0: This 3-pole MCCB carries 187 kA at 240 V AC and 121 kA at 415 V AC — numbers that put it squarely in high-fault-duty territory for industrial switchboards. At 440 V it still holds 36 kA, and at 690 V it manages 17 kA. For a 250 A frame, those interrupting capacities mean it can sit upstream of a transformer or feed a bus that sees significant fault current from the utility or a large motor group, without needing a current-limiting fuse ahead of it.
Thermal derating and panel fit
Rated continuous current Iu is 250 A, and it holds that full rating up to 50 °C ambient. Above that it derates: 243.3 A at 55 °C, 236.5 A at 60 °C, 229 A at 65 °C, and 223 A at 70 °C. If your panel ambient runs hot — say, a packed enclosure near a furnace line — you need to account for that drop. The 70 mm depth × 105 mm width × 158 mm height footprint is standard for the 3VA frame; it mounts on a DIN rail or direct-panel, with IP40 protection on the front face.
Auxiliary contacts and release configuration
Factory-fitted with one auxiliary switch and one trip alarm switch (HP type) — that gives you a remote status signal for open/closed and a separate alarm on fault trip. No undervoltage release, no shunt trip, no ground-fault module on this variant. The overcurrent release is the fixed TM240 thermal-magnetic type; there is no communication function, phase-failure detection, or voltage trigger. It is a straightforward line-protection breaker for applications where you just need basic overload and short-circuit protection with remote indication.