What this 400 A MCCB delivers — and where the ratings matter
The Siemens SENTRON 3VA2440-5HL32-0KA0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, built to handle 400 A continuously across the full ambient range from 40 °C through 70 °C — no derating needed up to the top end. That makes it a solid pick for a main feeder or a large motor branch where the panel runs hot and you don't want to oversize the frame just to hold rating at elevated temps. Breaking capacity is the headline here: 187 kA at 240 VAC, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 9 kA at 690 V. The trip indicator is absent, so you won't get a visual flag on the breaker face after a trip; plan for that in your troubleshooting workflow. Communication function is not built in, so this is a standalone breaker, not a networked power distribution unit.
This MCCB is designed for DIN-rail or direct-mount installation inside a distribution panel or motor control center. The 3-pole format with 400 A continuous rating makes it a natural main breaker for a 400 A sub-distribution board or a large feeder protecting a bank of smaller branch breakers. The shunt trip release lets you wire in an emergency-stop or remote-trip pushbutton — common in safety circuits for conveyors, pumps, or production lines where you need to kill power from a central location. The 5 kA short-time withstand (limited to 1 second) matters for selective coordination downstream — you can set the trip curve so a branch breaker clears a fault before this main trips, keeping the rest of the plant online.