What this MCCB delivers
The Siemens SENTRON 3VA2340-6HL32-0DA0 is a 3-pole molded case circuit breaker rated for 400 A continuous current at 40 °C, with a maximum breaking capacity of 242 kA at 240 V and 187 kA at 415 V. That 242 kA figure at 240 V means it can safely interrupt faults up to that level without cascading upstream — critical for high-fault panels near large transformers or utility feeds. At 690 V the breaking capacity drops to 7.5 kA, so keep that in mind if your line runs at higher voltage. The continuous current holds flat at 400 A from 40 °C through 50 °C, then derates to 385 A at 55 °C, 370 A at 60 °C, 355 A at 65 °C, and 340 A at 70 °C. If your panel ambient runs above 50 °C, size the load side accordingly — the breaker won't trip early, but you lose headroom. It includes an undervoltage release (UVR) for coordinated shutdown on voltage loss — no auxiliary switch, no ground-fault monitoring, no communication module. This is a straight line-protection breaker, not a multifunction unit.
Panel fit and integration
Dimensions are 138 mm wide, 248 mm high, 110 mm deep — fits standard MCCB panel cutouts. The 110 mm depth means it clears shallow backpanels without a gland-plate extension. No DIN-rail mount; this is a bolt-on frame for fixed or draw-out chassis. Power loss at full rated current is 98.5 W — account for that in enclosure thermal calculations, especially if the panel is sealed or has limited ventilation.