What this 250A MCCB does for a panel
The Siemens SENTRON 3VA2225-7HN32-0DL0 is a 3-pole molded case circuit breaker rated for 250 A continuous current at 40 °C, sized for line protection in industrial distribution panels. Its 330 kA interrupting capacity at 240 V means it can clear a massive fault without the arc flashing upstream — that's the kind of rating that keeps a main breaker from tripping when a downstream feeder shorts. At 415 V and 440 V it still holds 242 kA, and at 500 V it's 187 kA, so it handles most low-voltage plant distributions. At 690 V the rating drops to 4.5 kA, which is expected for this frame class — you wouldn't spec it for a 690 V motor feeder without checking coordination.
Thermal derating and power loss
The breaker holds its full 250 A up to 50 °C ambient. Above that it derates linearly — 241 A at 55 °C, 232 A at 60 °C, 222 A at 65 °C, and 213 A at 70 °C. That matters if the panel sits near a furnace or in a hot mezzanine. Maximum power loss is 50.5 W, which you'll need to account for in the enclosure thermal budget. Operating range is -25 °C to 70 °C; storage from -40 °C to 80 °C.
Built-in auxiliary switches and undervoltage release
This variant comes with 2 auxiliary switches, 1 trip alarm switch, and 1 electrical alarm switch (HQ type), plus an undervoltage release (UVR). That means you get status feedback for remote monitoring — the aux switches signal open/closed, the trip alarm flags a fault trip, and the UVR drops the breaker if control voltage falls below a threshold. No communication function built in, so it's a standalone protection device, not a networked power meter.
Physical fit and panel integration
Dimensions are 105 mm wide, 181 mm high, and 86 mm deep. That's a standard 3-pole MCCB footprint for this SENTRON frame. The basic switch assembly carries order code 3VA2225-7HN32-0AA0, so if you're replacing just the switching mechanism you can order that subassembly. No voltage trigger, no ground-fault monitoring on this version — it's a straight line-protection breaker with UVR.