The Siemens SENTRON 3VA2340-6HN32-0KL0 is a 3-pole molded case circuit breaker rated for 400 A continuous current (Iu) at 40 °C, with an ETU350 electronic trip unit for line protection. Its interrupting capacity hits 242 kA at 240 V AC and 187 kA at 415 V AC — enough to handle high-fault utility feeds or transformer secondaries without cascading upstream. The 96 W maximum power loss means the panel builder should account for heat dissipation in a confined enclosure, especially when the breaker is loaded near its 400 A rating.
Breaking capacity and derating
At 240 V the breaker clears 242 kA; at 415 V and 440 V it still handles 187 kA, dropping to 121 kA at 500 V and 7.5 kA at 690 V. That 7.5 kA figure at 690 V is the practical limit for 690 V line-to-line systems — verify the available fault current at the point of installation. The 400 A rating holds from 40 °C up to 50 °C, then derates to 385 A at 55 °C, 370 A at 60 °C, 355 A at 65 °C, and 340 A at 70 °C. If the breaker lives in a warm panel or near other heat sources, use the 55 °C or 60 °C column for sizing.
Auxiliary and shunt-trip configuration
This variant ships with a shunt trip (STL) release and a full auxiliary contact block: 2 auxiliary switches, 1 trip alarm switch, and 1 electrical alarm switch (HQ). The voltage trigger is present, so remote tripping via the shunt release is wired in from the factory. No undervoltage release, no ground-fault monitoring, and no communication module on this order code — if those are needed, look at the 3VA2 platform options with the UG or COM slots.
Mounting and panel fit
The breaker measures 248 mm high, 138 mm wide, and 110 mm deep. That 110 mm depth is the body only — add clearance for the rear arc chamber and front rotary handle swing. It mounts on a standard DIN rail or can be screw-fixed to a backplate. The 138 mm width for a 3-pole frame is typical for this class, so it fits in a standard MCC bucket or distribution panel without surprises.