400 A MCCB with 242 kA interrupting capacity
The Siemens 3VA2340-6JQ32-0HC0 is a SENTRON molded case circuit breaker rated for 400 A continuous current at 40 °C, with a maximum breaking capacity of 242 kA at 240 V. That interrupting rating drops to 187 kA at 415 V and 440 V, then to 121 kA at 500 V, and 40 kA at 690 V — so the available fault current at your service voltage is the spec that decides fit, not the headline 242 kA figure.
Above that, derate linearly: 375 A at 55 °C, 350 A at 60 °C, 325 A at 65 °C, and 300 A at 70 °C.
Mechanical endurance and dimensions
Rated for 15,000 latching operations. Panel cutout dimensions: 248 mm height, 138 mm width, 110 mm depth. The 3-pole frame is line-protection version with no undervoltage release and no phase-failure detection.