Siemens SENTRON 3VA2225-7HN32-0DA0 — 250 A MCCB with Undervoltage Release
The Siemens SENTRON 3VA2225-7HN32-0DA0 is a 3-pole molded case circuit breaker (MCCB) rated for 250 A continuous current, designed for line protection in industrial distribution panels. Its interrupting capacity hits 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 4.5 kA at 690 V — the 690 V figure drops sharply, so verify the fault current at your system voltage before specifying. This MCCB includes an undervoltage release (UVR) as the auxiliary release type, meaning it trips automatically when supply voltage drops below a set threshold — useful for preventing motor re-acceleration after a dip or for coordinated load shedding. No auxiliary switch or ground-fault monitoring is fitted on this variant.
Current Rating and Thermal Derating
The breaker carries 250 A continuously at ambient temperatures up to 50 °C. Above that, it derates: 241 A at 55 °C, 232 A at 60 °C, 222 A at 65 °C, and 213 A at 70 °C. If your panel runs hot — say, a sealed enclosure near a furnace line — factor the 55 °C or 60 °C row into your load calculation rather than the 250 A nameplate. Power loss at full load is 50.5 W maximum. That's modest for a 250 A frame, but in a dense panel with multiple breakers side-by-side, the cumulative heat can raise internal ambient — check the derating curve if you're stacking several in a row.
Physical Fit and Panel Integration
Dimensions: 105 mm wide, 181 mm high, 86 mm deep. That 86 mm depth (3.39 in) is the critical number for shallow backpanels or enclosures with limited clearance behind the mounting plate — measure your gland plate depth before committing. The 105 mm width (4.13 in) is standard for a 3-pole MCCB in this class; it occupies three 35 mm DIN-rail module positions if mounted on a rail, though the SENTRON 3VA series typically bolts directly to a mounting plate.