Siemens SENTRON 3VA1225-6EF32-0CH0 — 250 A MCCB with High Breaking Capacity
Thermal derating is published across the full operating range: it holds 250 A continuously from 40 °C up to 50 °C, then steps down to 243 A at 55 °C, 237 A at 60 °C, 230 A at 65 °C, and 223 A at 70 °C. That means in a tightly packed enclosure running at 60 °C ambient, you need to budget for 237 A continuous — not the nameplate 250 A.
Dimensions & Panel Fit
Physical footprint: 105 mm wide, 158 mm high, 70 mm deep. The 70 mm depth leaves clearance behind the door for wiring and auxiliary modules.
Built-in Auxiliaries & Releases
The UVR is factory-installed, not a field-add kit — verify your control voltage matches the release rating before installation. The trip indicator is also present, giving a visible flag on the breaker face after a fault trip.