What this MCCB does and where it fits
The Siemens SENTRON 3VA2440-7HL32-0HH0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection. It carries a continuous 400 A at ambient temperatures from 40 °C up to 70 °C with zero derating — that means you can load it to full nameplate even in a hot panel without bumping the frame size. The adjustable thermal-magnetic trip unit covers a 600 A to 4800 A range, so you set the instantaneous pickup to match your downstream cable and load inrush, not the other way around. Breaking capacity is where this breaker earns its keep in a distribution board. At 240 V it interrupts 330 kA; at 415 V and 440 V it holds 242 kA; at 500 V still 187 kA. Only at 690 V does it drop to 9 kA — that's the limit of the internal arc chamber. For most 400 V class switchgear these numbers give generous SCCR headroom for selective coordination upstream of branch feeders. Physical fit: 248 mm tall, 138 mm wide, 110 mm deep. That 110 mm depth is the dimension that matters when you're laying out busbar chambers or enclosure clearances — it's the front-to-back space the breaker occupies on the mounting plate.
Built-in accessories and wiring
This order code ships with a shunt trip (STL) for remote opening and two auxiliary switches plus one trip alarm switch (HQ configuration). The basic switch core is the 3VA2440-7HL32-0AA0 — the accessory pack adds the remote-trip and status-reporting hardware without needing a separate kit. No undervoltage release, no ground-fault module, no communication function on this variant; keep that in mind if your spec calls for UVR or Modbus. Maximum power loss is 63.5 W at full rated current. That's moderate for a 400 A frame — plan for ventilation if the breaker is enclosed in a small glanded box, but in a standard switchboard it dissipates fine through the mounting plate.