What this MCCB carries and where it fits
The Siemens 3VA2340-6HL32-0DL0 is a 3-pole SENTRON molded case circuit breaker rated for 400 A continuous current at 40 °C ambient, with a maximum interrupting capacity of 242 kA at 240 V AC. That interrupting rating drops to 187 kA at 415 V and 440 V, and to 121 kA at 500 V — so the voltage class of your distribution determines whether this breaker clears a fault without cascading upstream. It's designed for line protection, meaning it sits at the feeder or main in a panel, not on a motor branch circuit. The continuous current derates above 50 °C: 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 hot, size the load side accordingly — the 400 A nameplate only holds up to 50 °C.
Auxiliary and undervoltage release configuration
This variant ships with an undervoltage release (UVR) installed, plus a factory-fitted auxiliary switch block: 2 auxiliary switches + 1 trip alarm switch + 1 electrical alarm switch HQ. The UVR means the breaker trips when control voltage drops below a threshold — common in emergency-stop strings or loss-of-mains protection schemes. The basic switch core is order code 3VA2340-6HL32-0AA0, so if you need to swap the internal switch mechanism, that's the service part. No ground-fault monitoring on this unit, and no communication module. It's a standalone thermal-magnetic or electronic-trip MCCB — no Modbus, no PROFIBUS. The trip indicator is present, so after a fault event you get a visual flag without opening the cover.
Physical fit and environmental limits
Dimensions: 248 mm high, 138 mm wide, 110 mm deep. That's about 9.76 by 5.43 by 4.33 inches. It's a standard MCCB footprint for a 400 A frame — mounts on a DIN rail or direct panel via the rear mounting slots. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. Power loss at full load is 98.5 W maximum — factor that into your enclosure thermal budget.