What it is and what it does
The Siemens SENTRON 3VA2340-6JQ32-0HA0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, designed to handle continuous currents up to 400 A at 40 °C through 50 °C, with a thermal derating curve that drops to 300 A at 70 °C. Its breaking capacity hits 242 kA at 240 V, 187 kA at 415/440 V, 121 kA at 500 V, and 7.5 kA at 690 V — so at typical 480 V distribution levels you've got serious fault-current headroom. The adjustable thermal-magnetic trip is set from 80 A to 400 A full-scale, meaning you dial in the actual load, not just accept a fixed threshold.
Dimensions and panel fit
The breaker measures 248 mm tall, 138 mm wide, and 110 mm deep — a standard SENTRON 3VA2 footprint that drops into existing MCCB panelboards without re-drilling gland plates. The 110 mm depth keeps it clear of shallow enclosure doors; verify the dead-front clearance if your panel has a rear-mounted bus stack.
Auxiliary and communication
The 3VA2340-6JQ32-0HA0 includes a shunt trip release (STL) for remote tripping and has communication function built in — no separate module required for basic signaling. It ships without auxiliary switches, so if you need status feedback to a PLC, plan to add a separate auxiliary switch block. Maximum power loss is 96 W at rated current, which matters for enclosure thermal calculations in a multi-breaker lineup.