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. 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. 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.
Auxiliary and shunt-trip configuration
The voltage trigger is present, so remote tripping via the shunt release is wired in from the factory.
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.