That 250 A holds flat through 50 °C — you don't lose headroom until 55 °C, where it derates to 238 A, then 225 A at 60 °C, 213 A at 65 °C, and 200 A at 70 °C. For a critical-spare buyer, this means the breaker can sit in a warm enclosure without surprise tripping, as long as the ambient stays under 50 °C.
Breaking capacity and trip unit
Breaking capacity hits 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 4.5 kA at 690 V. At 415 V, that 121 kA covers most industrial service-entrance and feeder applications with headroom for high-fault scenarios. A shunt trip release (STL) is built in for remote emergency switching. Two auxiliary HQ contacts report breaker position back to a PLC or status panel.
Dimensions are 181 mm high, 140 mm wide, 86 mm deep — a 4-pole frame that fits standard Siemens 3VA2 mounting hardware and busbar systems. The 86 mm depth (3.39 in) is shallow enough for most 600 mm deep enclosures, leaving room for rear-connected busbars or cable lugs.