The Siemens SENTRON 3VA2340-5HN42-0HA0 is a 4-pole molded case circuit breaker (MCCB) rated for a continuous current Iu of 400 A, configured for line protection. It carries a breaking capacity of 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 17 kA at 690 V — these are the short-circuit ratings that determine whether this breaker clears a fault without upstream coordination failure. The overcurrent release is an ETU350 electronic trip unit, and the auxiliary release is a shunt trip (STL).
Ratings and derating
The 400 A rating holds at ambient temperatures up to 50 °C. Above that, it derates: 385 A at 55 °C, 370 A at 60 °C, 355 A at 65 °C, and 340 A at 70 °C. If the panel ambient runs hot — say, next to a drive cabinet — the 55 °C derate to 385 A is the figure to use for load planning. Maximum power loss is 96 W. Rated insulation voltage Ui is 800 V. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.
Dimensions and panel fit
The breaker measures 184 mm wide, 248 mm high, and 110 mm deep. These dimensions govern the mounting footprint in the switchboard — the 184 mm width is the critical number for multi-breaker lineup spacing. The 110 mm depth includes the case body; verify projection past the mounting plane against enclosure depth.