The Siemens SENTRON 3VA2340-6HM32-0AA0 is a 3-pole molded case circuit breaker rated for 400 A continuous current at 40 °C, with a maximum interrupting capacity of 242 kA at 240 V AC. The breaking capacity drops to 187 kA at 415 V and 440 V, 121 kA at 500 V, and 7.5 kA at 690 V — so the voltage at the fault point determines whether this breaker clears a high-fault event or needs upstream coordination.
Thermal derating and power dissipation
Above that, derate linearly: 385 A at 55 °C, 370 A at 60 °C, 355 A at 65 °C, and 340 A at 70 °C. Maximum power loss is 96 W — a figure to account for in enclosed panel heat calculations, especially if the breaker is mounted alongside other high-current devices.
The 138 mm width across three poles is standard for this class of SENTRON MCCB; verify the existing busbar or lug spacing matches before committing the panel layout.