The Siemens SENTRON 3VA2340-6JQ32-0AE0 is a 3-pole molded case circuit breaker rated for line protection, with a full-scale current of 400 A and an initial setting of 80 A. Its interrupting capacity reaches 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 7.5 kA at 690 V — figures that govern selectivity coordination in high-fault industrial distribution. A communication function is built in, and the breaker carries four HQ auxiliary switches; there is no undervoltage release or auxiliary release on this variant.
Thermal derating and panel fit
The breaker holds its 400 A rating through 50 °C ambient; above that it derates linearly to 300 A at 70 °C. That curve matters when the MCCB sits in a crowded enclosure with other heat sources — the 96 W maximum power loss adds to the thermal budget. Physical dimensions are 248 mm high, 138 mm wide, 110 mm deep, which fits standard SENTRON 3VA panel cutouts and busbar centers. Operating range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.