The Siemens SENTRON 3VA2225-8HL32-0HC0 is a 3-pole molded case circuit breaker rated for 250 A continuous current, with a rated insulation voltage of 800 V. It's fitted with an ETU320 electronic trip unit and a shunt trip release (STL), plus two auxiliary switches HQ. Breaking capacity hits 440 kA at 240 V, 330 kA at 415/440 V, 242 kA at 500 V, and 50.4 kA at 690 V — that's serious fault-clearing for a 250 A frame.
Thermal derating and real-world fit
This MCCB carries its full 250 A rating up to 50 °C ambient. Above that it steps down: 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 cramped enclosure near a furnace or drive stack — that derating curve is the number you need, not the nameplate. The max power loss is 48 W, which matters for enclosure heat calculations.
What's inside the can
The base switching mechanism is the 3VA2225-8HL32-0AA0. The integrated auxiliary trip module is a 3VA9688-0BL30. The shunt trip (STL) is wired for remote tripping — useful in emergency-stop circuits or automated disconnects. There's no undervoltage release, no ground-fault monitoring, and no communication module. The ETU320 is a basic electronic trip unit; it handles LSI protection (long-time, short-time, instantaneous) but not ground-fault or power metering.
Panel fit and mounting
Dimensions are 181 mm high, 105 mm wide, and 86 mm deep. That's a standard 3-pole MCCB footprint for a 250 A frame — it'll drop into most SENTRON 3VA mounting bases or panel cutouts without surprises. The auxiliary switches (2 HQ) are built in, so you don't need to add a side-mount accessory for status feedback.