What ships in the carton
The Siemens SENTRON 3VA2340-6KP32-0BA0 is a 3-pole molded case circuit breaker rated for 400 A continuous current at 40 °C, designed for line protection in distribution panels. Breaking capacity hits 242 kA at 240 V and 187 kA at 415 V, so it handles high-fault service-entrance or feeder duty without cascading upstream. The unit ships with an integrated undervoltage release (UVR) and onboard communication function — no auxiliary switch module to order separately. Kit is complete: the breaker, UVR, and comms interface are all in the carton.
Thermal derating — the real continuous current
The 400 A rating holds flat from 40 °C through 50 °C ambient. Above that, the frame derates linearly: 375 A at 55 °C, 350 A at 60 °C, 325 A at 65 °C, and 300 A at 70 °C. If the panel ambient runs hot — say, a packed enclosure near a furnace line — size the load at the derated figure, not the nameplate 400 A. The 70 °C ceiling matches the maximum operating temperature spec, so the breaker itself is fine; the load current is what drops.
Breaking capacity by voltage level
This MCCB delivers 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. The steep drop at 690 V means it is not a universal high-voltage breaker — use it on 240–500 V systems where the SCCR matches. For 690 V applications, the 7.5 kA figure limits it to low-fault installations or requires upstream current-limiting fuses.
Panel fit and dimensions
Dimensions are 248 mm high, 138 mm wide, 110 mm deep. The 3-pole frame mounts on a standard DIN rail or panel-mount base in a distribution board. The 110 mm depth leaves clearance for rear-connected busbars or cable lugs. Verify the enclosure depth against the 110 mm plus wire-bending space — standard 200 mm deep enclosures work, shallow troughs may not.