Siemens 3VA1025-4ED32-0DC0 — 25 A SENTRON MCCB for Line Protection
It carries a rated current of 25 A at 40 °C, with a breaking capacity of 121 kA at 240 V AC and 75.6 kA at 415 V AC — figures that cover most industrial service-entrance and feeder applications where high fault current is expected. Maximum power loss is 11 W, which is modest for a 25 A frame and keeps enclosure heat rise manageable in a crowded cabinet.
At 415 V AC (common in European industrial grids) the rating is 75.6 kA, still high enough for most main-breaker positions. At 690 V AC it drops to 11.9 kA, which is adequate for motor-circuit protection in 690 V drives but not for high-fault buswork. Thermal rating holds at 25 A from 40 °C through 50 °C, then derates to 24 A at 55–60 °C and 23 A at 65–70 °C. That means in a hot enclosure (say 55 °C internal ambient) you lose only 1 A of headroom — the breaker stays usable for a 24 A continuous load without nuisance tripping.