Siemens SENTRON 3VA2340-5HN42-0CH0 — 400 A MCCB with ETU350, Line Protection
The Siemens SENTRON 3VA2340-5HN42-0CH0 is a 4-pole molded case circuit breaker (MCCB) rated for 400 A continuous current at 40 °C, with an interrupting capacity of 187 kA at 240 V AC. It carries the ETU350 electronic trip unit, configured for line protection — meaning it protects cables and busbars against overload and short-circuit, not motor or generator protection. The 187 kA at 240 V is the headline SCCR figure; at 415 V it still breaks 121 kA, and at 690 V it holds 17 kA. That puts this breaker in the high-interrupting-capacity tier of the SENTRON 3VA family, sized for main or feeder duty in large distribution panels where fault current is severe. The ETU350 is a microprocessor-based trip unit with adjustable thermal and magnetic settings, plus a trip indicator. The breaker includes an undervoltage release (UVR) as standard — part number 3VA9608-0BB24 for the auxiliary trip assembly. The auxiliary contact configuration is 2 auxiliary switches plus 1 trip alarm switch (HQ type), giving status feedback for both open/closed and tripped conditions. Maximum power loss is 98.5 W, which matters for enclosure thermal management in a fully loaded panel. Dimensions are 184 mm wide, 248 mm high, 110 mm deep. The 184 mm width is the standard 4-pole MCCB footprint in the 3VA frame size — it will occupy the same panel space as other 4-pole SENTRON breakers in this current class. Operating temperature range is -25 °C to 70 °C, with derating above 55 °C: 385 A at 55 °C, 370 A at 60 °C, 355 A at 65 °C, 340 A at 70 °C. Storage range is -40 °C to 80 °C.
Sourcing & Lifecycle — Current Production, Quoted to Order
The base switch assembly is 3VA2340-5HN42-0AA0; the integrated auxiliary trip is 3VA9608-0BB24. These sub-component order codes are useful for spare-parts ordering or if you need to replace the trip unit separately.
Panel Integration — Footprint and Mounting
This MCCB mounts on a DIN rail or can be screw-fixed to a backplate. The 184 mm width matches the standard 4-pole SENTRON 3VA frame — it will sit adjacent to other 3VA breakers without extra spacing. The undervoltage release is factory-installed; no field wiring of a separate UVR module is required. The auxiliary contact block (2 aux + 1 trip alarm) is integrated, so you get status feedback without an add-on module.