The Siemens 3VA2340-5HN42-0LH0 is a 4-pole IEC frame 400 molded-case circuit breaker with a 55 kA interrupting capacity at 415 V (breaking capacity class M). It carries a 400 A continuous rating (In) and is fitted with an ETU350 LSI electronic trip unit. The overload protection (Ir) is adjustable from 160 A to 400 A; short-circuit protection (Isd) is set from 1.5 to 10 times Ir, with an instantaneous pickup (Ii) fixed at 10 times In. The neutral conductor protection is selectable: OFF, 50%, or 100% of the phase protection. A 24 V DC universal release accessory is included, along with a nut keeper kit and provision for up to two auxiliary switches.
Mounts in a standard panel or enclosure on a DIN rail or fixed baseplate. The 4-pole configuration handles three-phase plus neutral in a single package, simplifying wiring in distribution boards. The ETU350 LSI trip unit allows field-adjustable settings without opening the breaker — a time-saver during commissioning or when load characteristics change.