Thermal Derating and Breaking Capacity — What the Ratings Mean
The 3VA1125-3EF32-0AE0: The 25 A rating holds flat from 40 °C through 50 °C, then derates to 24 A at 55–60 °C and 23 A at 65–70 °C. That means a panel running at 55 °C ambient loses 1 A of headroom — plan the load margin accordingly. The breaking capacity curve is the real selection gate: at 240 V the 75.6 kA figure covers most North American secondary distribution; at 415 V the 52.5 kA rating suits European 400 V industrial mains. If your fault current at 440 V exceeds 32 kA, this breaker is undersized for that node.
The 3VA1125-3EF32-0AE0 measures 130 mm high, 76.2 mm wide, and 70 mm deep — a standard MCCB footprint that mounts directly on a DIN rail or panel plate. The 3-pole width (76.2 mm) is the same as the 3VA1110 and 3VA1112 siblings, so a panel drilled for a 3VA1110-5ED36-0AC0 accepts this unit without re-drilling or re-bussing.
Release Configuration and Accessories
If you need shunt trip, UVR, or ground-fault add-ons, this base unit does not carry them; you would step to a different 3VA variant.