What this MCCB carries — and where it fits
The Siemens SENTRON 3VA2340-5KP32-0BH0 is a 3-pole molded case circuit breaker rated for 400 A continuous current, with a maximum frame rating of 4 000 A and a minimum trip setting of 600 A. It's designed for line protection in distribution panels, with interrupting capacity that varies by voltage: 187 kA at 240 V, 121 kA at both 415 V and 440 V, 75.6 kA at 500 V, and 7.5 kA at 690 V. That spread tells you this breaker is built for high-fault industrial mains — not light commercial subfeeds. Thermal derating is published from 40 °C through 70 °C: it holds full 400 A up to 50 °C, then drops to 375 A at 55 °C, 350 A at 60 °C, 325 A at 65 °C, and 300 A at 70 °C. If your panel ambient runs hot, that curve decides the real ampacity — not the nameplate. It ships with an undervoltage release (UVR) and a 2-auxiliary-switch plus 1-trip-alarm-switch configuration, plus a communication function for remote monitoring or trip indication. The trip indicator is standard, and there's no ground-fault monitoring built in — that's external if needed.
Panel fit and integration
Dimensions: 248 mm height, 138 mm width, 110 mm depth. That's a 3-pole frame that fits standard switchboard or panelboard cutouts — no odd footprint. The 110 mm depth means it clears shallow enclosures where deeper MCCBs would hit the backplate or gland plate. Operating temperature range -25 °C to 70 °C; storage from -40 °C to 80 °C. Power loss at full load is 98.5 W max — factor that into panel thermal budget if you're packing multiple breakers in a sealed enclosure.