Siemens 3VA2340-6JQ32-0BA0 — SENTRON MCCB, 400 A Frame, Line Protection with Undervoltage Release
The Siemens SENTRON 3VA2340-6JQ32-0BA0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying a 400 A full-scale value and a trip-setting range from 600 A minimum to 4,000 A maximum. It delivers a 242 kA breaking capacity at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 7.5 kA at 690 V — which means it can safely interrupt fault currents up to those levels without cascading upstream, a critical parameter for panel SCCR compliance under UL 508A. Thermal derating is specified across the operating range: the breaker carries a full 400 A continuously at ambient temperatures up to 50 °C, then derates to 375 A at 55 °C, 350 A at 60 °C, 325 A at 65 °C, and 300 A at 70 °C. This curve governs the actual conductor and enclosure fill sizing — a panel builder must account for the derated value at the enclosure's internal ambient, not the nameplate 400 A, when coordinating with downstream distribution. The breaker includes an undervoltage release (UVR) as the auxiliary release type, and it is communication-capable, supporting integration into monitored power distribution schemes. Maximum power loss is 98.5 W, which contributes to the enclosure's thermal budget. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.
Physical Fit and Panel Integration
Dimensions are 248 mm height, 138 mm width, and 110 mm depth. The 138 mm width is the standard 3-pole MCCB footprint for this SENTRON frame size, fitting the same DIN-rail or panel-mount cutout as other 3VA2 breakers. Verify the 110 mm depth against enclosure gland-plate clearance — this is a through-panel mounted device, not a plug-in unit.