Siemens SENTRON 3VA2340-6HN32-0HA0 — 400 A MCCB with Shunt Trip
The Siemens SENTRON 3VA2340-6HN32-0HA0 is a 3-pole molded case circuit breaker (MCCB) rated for 400 A continuous current, designed for line protection in distribution panels and industrial switchgear. It carries a shunt trip release (STL) for remote tripping, making it suitable for emergency-off or interlock circuits where the breaker must open on a signal from a safety relay or PLC. Breaking capacity is 242 kA at 240 V AC, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 7.5 kA at 690 V — figures that cover most industrial service-entrance and sub-distribution applications where fault current runs high at lower voltages. The thermal derating curve holds 400 A flat from 40 °C to 50 °C, then steps down: 385 A at 55 °C, 370 A at 60 °C, 355 A at 65 °C, and 340 A at 70 °C. That means in a warm enclosure or high-ambient machine room you lose about 15 % of the rating at the top end — plan the load accordingly.
Sizing and Integration
Dimensions are 248 mm high, 138 mm wide, 110 mm deep — a standard 3-pole MCCB footprint for panelboard or enclosed switchgear mounting. The 110 mm depth (4.33 in) leaves clearance for rear-connected bus bars or cable lugs in a typical 600 mm deep enclosure. Power loss is 96 W maximum at rated load, so account for that in the enclosure thermal calculation. The shunt trip release (STL) is factory-installed; no auxiliary switch is fitted on this variant. If you need a status contact for remote indication, you'll add an auxiliary switch block (not included). The breaker has a voltage-trigger function but no undervoltage release and no ground-fault monitoring module — this is a straight line-protection device with remote-trip capability only.