The Siemens 3VA2340-5HN32-0LC0 is a 3-pole IEC frame 400 molded case circuit breaker from the SENTRON 3VA2 series, rated for line protection with an ETU350 LSI trip unit. The continuous current rating In is 400 A, with overload protection Ir adjustable from 160 A to 400 A, and short-circuit protection Isd adjustable from 1.5 to 10 times Ir. Instantaneous pickup Ii is fixed at 10 x In. This breaker also includes a universal release 24 V DC accessory for shunt or undervoltage tripping, plus space for up to two auxiliary switches.
In a 400 V distribution panel fed by a transformer of 1000 kVA or larger, prospective fault currents often exceed 25 kA — this unit handles that margin. The ETU350 is an electronic trip unit, meaning it holds its calibration over temperature and allows finer adjustment than a thermal-magnetic. The 24 V DC universal release accessory is wired separately for remote tripping via a safety circuit or emergency-stop chain.
Deployment context
The nut keeper kit (included) secures the breaker to the busbar assembly — a detail that saves time during panel build because the nuts stay captive while you torque the bus connections. The 3-pole configuration is typical for three-phase 400 V line protection feeding motor control centers, lighting panels, or sub-distribution boards.