What the ratings mean for your panel
The 3VM1112-3ED16-0AA2: The 25 kA Icu at 240 V tells you this breaker can safely interrupt a fault current up to that level without welding contacts or rupturing the case — critical for ensuring selective coordination downstream. The fixed Ir=125 A means the overload pickup is set at the factory; no dial to adjust, so the breaker is sized to the conductor and load, not tuned after installation. The Ii=10 × In short-circuit pickup (1250 A) is also fixed, so it will ride through moderate motor inrush but trip fast on a hard bolted fault. Terminal connection — no plug-in base — so it bolts directly to the bus or cable lugs in the panel.