The 3VA1150-4EF32-0CH0: Breaking capacity drops with system voltage: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V.
Thermal rating and ambient derating
Rated 50 A from 40 °C through 50 °C (–), then derates: 49 A at 55 °C, 48 A at 60 °C, 46 A at 65 °C, 45 A at 70 °C. For a 50 A feeder in a panel that sees 55 °C internal temperature, expect a 1 A reduction — minor, but the derating curve is there for the thermal model.
Auxiliary functions and integration
The auxiliary switches report position back to a PLC or status lamp.
The 76.2 mm width (3 inches) is standard for a 3-pole MCCB in the SENTRON 3VA1 frame — it mounts on a DIN rail or directly to a backplate. The depth of 70 mm (2.76 in) leaves clearance for wiring and the UVR module.