400 A MCCB with ETU320 — line protection for high-fault panels
The Siemens 3VA2340-6HL32-0HH0 is a SENTRON 3VA2 molded case circuit breaker rated for 400 A continuous current (Iu) across a 40–50 °C ambient range, with no derating needed up to 50 °C. At 55 °C it still carries 385 A, and at 70 °C it holds 340 A — so the full 400 A frame is usable in most ventilated enclosures without oversizing. The ETU320 electronic trip unit handles line protection duty (overload and short-circuit), with a shunt trip (STL) auxiliary release built in for remote tripping. The auxiliary contact configuration — 2 auxiliary switches plus 1 trip alarm switch (HQ) — gives the panel builder separate NO/NC for status feedback and a dedicated alarm contact that flags a trip event even after the breaker resets. Breaking capacity is 242 kA at 240 V, 187 kA at 415/440 V, 121 kA at 500 V, and 40 kA at 690 V — figures that cover most industrial service-entrance and distribution applications where high fault current is expected. The 800 V rated insulation voltage (Ui) confirms the breaker is insulated for 690 V line-to-line systems.
Lifecycle and sourcing — active, quoted to order
The 3VA2 platform is Siemens' mainline MCCB family, so documentation (datasheets, CAD models, UL/IEC certificates) is readily available from the manufacturer's support portal. No last-time-buy windows or phase-out notices are associated with this code.
Panel fit and integration
Dimensions are 248 mm high, 138 mm wide, 110 mm deep — a standard 3-pole MCCB footprint for 400 A frames. The depth (110 mm) is shallow enough for most 600 mm deep enclosures with rear cable space; the 138 mm width means it occupies roughly 5.4 inches of DIN-rail or mounting-plate width per pole. Maximum power loss is 96 W at rated current — factor this into enclosure thermal calculations if the panel is densely packed or sealed. The operating temperature range is -25 °C to +70 °C; storage range is -40 °C to +80 °C.