The Siemens SENTRON 3VA2440-5HL32-0JL0 is a 3-pole molded case circuit breaker (MCCB) rated for 400 A continuous current (Iu) at 40 °C ambient, with an insulation voltage (Ui) of 800 V. It carries a breaking capacity of 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 17 kA at 690 V — figures that define its fault-interrupting capability across common distribution voltages.
Ratings and what they mean for panel fit
The 400 A rating holds flat from 40 °C to 50 °C, then derates to 384 A at 55 °C, 376 A at 60 °C, 368 A at 65 °C, and 360 A at 70 °C. If your enclosure ambient runs above 50 °C, the effective continuous current drops — size the breaker for the actual temperature, not the nameplate. The ETU320 electronic trip unit provides adjustable overload and short-circuit protection. A shunt trip release (STL) is built in for remote tripping. The auxiliary contact block includes two auxiliary switches, one trip alarm switch, and one electrical alarm switch (HQ) — enough for status feedback to a PLC or annunciator panel. Power loss is rated at 63.5 W maximum. In a densely packed panel, that heat must be managed — allow clearance and ventilation per Siemens mounting guidelines.
Physical integration
Dimensions: 248 mm height, 138 mm width, 110 mm depth. The 3-pole footprint is standard for this current class; panel cutout and busbar spacing should match Siemens SENTRON 3VA family mounting patterns.