What this MCCB carries and where it fits
The Siemens SENTRON 3VA2340-6JQ32-0KL0 is a 3-pole molded case circuit breaker rated for line protection, with a full-scale current of 400 A and a minimum setting of 600 A. Its interrupting capacity hits 242 kA at 240 V and 187 kA at 415 V and 440 V, so it handles high-fault utility feeds without cascading upstream. The 400 A rating holds flat from 40 °C through 50 °C, then derates to 375 A at 55 °C and 300 A at 70 °C — that thermal curve matters when you pack this into a warm enclosure. It ships with a shunt trip (STL) auxiliary release and a 2+1+1 auxiliary switch configuration (2 auxiliary switches, 1 trip alarm, 1 electrical alarm).
Panel fit — dimensions and mounting
The breaker measures 248 mm high by 138 mm wide by 110 mm deep. That 110 mm depth is the projection from the mounting surface — check your gland plate clearance if you're back-panel mounting in a shallow enclosure. The 138 mm width is standard for a 3-pole SENTRON 3VA frame; it fits the same DIN-rail footprint as the 3VA2 series breakers.
Environmental and compliance
Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. Maximum power loss is 96 W — factor that into your enclosure thermal calculation if you're grouping several breakers. The part includes a trip indicator and a voltage trigger, and it supports communication functions for integration into a monitored distribution system.