The 250 A frame is thermally rated to carry full load continuously at ambient temperatures up to 50 °C without derating; above that, the thermal curve steps down in 5 °C increments (238 A at 55 °C, 225 A at 60 °C, 213 A at 65 °C, 200 A at 70 °C).
Breaking capacity — what it means for fault duty
This MCCB interrupts 330 kA at 240 V AC, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 4.5 kA at 690 V. The steep drop to 4.5 kA at 690 V reflects the AC-1 duty limit of the 250 A frame at elevated voltage; if your system runs 690 V, verify the available fault current stays below that ceiling.
Listed as current-production (active lifecycle status). The ETU550 trip unit is the current-generation electronic release for the 3VA2 platform, with communication function onboard — meaning it can integrate with higher-level monitoring systems via the SENTRON communication modules. This is the part you spec into a new BOM or use as a drop-in replacement for an existing 3VA2 installation, not a phase-out candidate.
Dimensions: 181 mm height, 140 mm width, 86 mm depth. The 140 mm width on a 4-pole MCCB is standard for the 3VA2 frame — fits the same panel cutout and bus-bar spacing as other 250 A SENTRON 4-pole units. No undervoltage release fitted as standard; if you need UVR, it must be added as an accessory.
The SENTRON 3VA2 series carries IEC 60947-2 certification for molded case circuit breakers. The ETU550 release is a Class 1 electronic trip unit per IEC 60947-2 Annex F. Compliance documentation (CE, UKCA, RoHS, REACH) is standard with the brand.