What this MCCB carries and what it means for your panel
The Siemens SENTRON 3VA2340-5HL42-0DL0 is a 4-pole molded case circuit breaker rated for 400 A continuous current at 40 °C through 50 °C, with a thermal derating curve that drops to 340 A at 70 °C. Its breaking capacity hits 187 kA at 240 V AC, 121 kA at 415/440 V, 75.6 kA at 500 V, and 7.5 kA at 690 V — so the same breaker handles high-fault service entrance panels (240 V) and lower-fault distribution downstream. The 400 A frame means it's sized for main feeders or large motor branch circuits, not small subfeeds.
Mounting and integration — what fits where
Dimensions are 248 mm high, 184 mm wide, 110 mm deep. That 184 mm width on a 4-pole frame is standard for this class — it occupies the same DIN-rail or mounting-plate footprint as other 400 A SENTRON frames. The depth of 110 mm leaves room behind the gland plate for the rear terminals and arc chamber. If you're swapping into an existing panel, measure the cutout: the 184 mm width is the critical dimension for busbar alignment.
Auxiliaries and release options on this variant
The breaker ships with an undervoltage release (UVR) and a full auxiliary switch complement: 2 auxiliary switches, 1 trip alarm switch, and 1 electrical alarm switch (HQ type). The basic switch assembly is order code 3VA2340-5HL42-0AA0. The UVR drops the breaker when control voltage falls below the dropout threshold — standard for emergency-stop circuits or undervoltage protection on motor feeders. No ground-fault monitoring on this variant.