What this MCCB carries and where it fits
The Siemens 3VA2440-5HN32-0DC0 is a 3-pole SENTRON molded case circuit breaker sized for a 4800 A frame with a continuous current rating of 400 A across the full 40 °C to 70 °C ambient range — no derating needed up to that ceiling. Breaking capacity lands at 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 9 kA at 690 V. That SCCR headroom covers most industrial service-entrance and feeder applications where fault currents run high, particularly on 480 V and 600 V class systems. The unit includes an undervoltage release (UVR) and two HQ auxiliary switches. Line protection design, no ground-fault monitoring, no communication module.
Integration dimensions
Footprint: 138 mm wide, 248 mm tall, 110 mm deep. The 110 mm depth is the dimension from the mounting surface to the front of the breaker — relevant when planning gland-plate clearance or enclosure depth. Standard DIN-rail or panel-mount installation per SENTRON 3VA family practice.
Power loss and thermal budget
Maximum power loss is 66 W. In a sealed enclosure that figure drives the internal temperature rise; account for it in the thermal budget alongside the 70 °C maximum operating ambient.