The Siemens 3VA2340-6KP42-0AJ0 is a 4-pole IEC molded-case circuit breaker in the 3VA2 frame, rated 400 A continuous with a breaking capacity of 85 kA at 415 V (class H). That Icu figure means it can safely interrupt a fault up to 85,000 A without welding or rupturing — critical for high-fault installations like transformer secondaries or large motor control centers where available fault current is substantial.
The ETU850 electronic trip unit provides LSI protection (long-time, short-time, instantaneous) with adjustable pickups: overload Ir from 160 A to 400 A, short-time pickup Isd from 0.6x to 10x In, and instantaneous Ii from 1.5x to 10x In. The neutral conductor protection is also adjustable (OFF up to 100% of phase pickup). This breaker ships with a nut keeper kit, two auxiliary switches (HP), and one trip alarm switch (HP) — so it arrives ready for panel wiring without hunting down add-on accessories.