What this MCCB carries
The SENTRON 3VA2340-5JQ32-0BH0 is a 3-pole molded case circuit breaker rated 400 A continuous at 40 °C, with a maximum interrupting capacity of 187 kA at 240 V AC. That interrupting figure drops to 121 kA at 415 V and 440 V, then to 75.6 kA at 500 V, and 7.5 kA at 690 V — so the available fault current at the panel's service voltage decides whether this breaker holds or you need a higher-rated frame. The continuous current holds flat at 400 A from 40 °C through 50 °C, then derates to 375 A at 55 °C, 350 A at 60 °C, 325 A at 65 °C, and 300 A at 70 °C. If the enclosure runs hot, that derating curve is the one that governs the real load you can hang on it. It's designed for line protection (cable/feeder protection, not motor-only duty) and ships with an undervoltage release (UVR) built in, plus 2 auxiliary switches and 1 trip alarm switch. The UVR means the breaker trips when control voltage drops — common in safety circuits or remote shunt-trip applications. Communication function is onboard, so it can talk to a higher-level system for metering or remote trip indication.
Panel fit and mounting
The breaker measures 110 mm deep, 138 mm wide, and 248 mm tall. That 138 mm width is the standard 3-pole MCCB footprint for this SENTRON frame — it fits the same DIN-rail or screw-mount pattern as other 3VA2-family breakers in the same frame size. The depth of 110 mm means it clears most 200 mm deep enclosures with room for wiring gutters. Maximum power loss is 98.5 W, so factor that into the enclosure's thermal budget if you're packing several breakers in a tight cabinet.