Siemens SENTRON 3VA2340-5HN32-0KH0 — 400 A MCCB, Line Protection, High Interrupting Capacity
It carries a 187 kA interrupting capacity at 240 VAC, dropping to 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 7.5 kA at 690 V — the high 240 V figure suits it for low-voltage main or feeder duty where fault current is substantial.
Interrupting Capacity and Selectivity Planning
At 415/440 V (common for industrial motor control centers) the rating is still 121 kA, well above typical panel SCCR requirements. Maximum power loss is 96 W — account for that heat in the enclosure ventilation calculation, especially if the breaker is enclosed without forced airflow.
Dimensions are 248 mm height, 138 mm width, 110 mm depth — a standard MCCB footprint for 400 A class. Three poles, so it occupies a 138 mm wide slot on the mounting plate. No undervoltage release is fitted (: No), so if your safety circuit requires a UVR, you will need to add one externally or specify a different variant.
Environmental and Derating
At 55 °C it derates to 385 A, at 60 °C to 370 A, at 65 °C to 355 A, and at 70 °C to 340 A.