What this MCCB carries on the nameplate
The Siemens SENTRON 3VA2340-6HL32-0AC0 is a 3-pole molded case circuit breaker rated for 400 A continuous current at 40 °C, with the ETU320 electronic overcurrent release handling line protection duty. Breaking capacity hits 242 kA at 240 V, 187 kA at 415 V, and still holds 40 kA at 690 V — so it clears high-fault scenarios across common industrial voltage levels without cascading upstream.
Thermal derating and real-world current
The 400 A rating holds flat from 40 °C through 50 °C, then drops to 385 A at 55 °C, 370 A at 60 °C, 355 A at 65 °C, and 340 A at 70 °C. If the panel ambient runs hot — say, next to a drive cabinet — size the load side for the derated figure, not the 40 °C sticker.
Mounting and panel fit
Dimensions are 248 mm high, 138 mm wide, 110 mm deep — a standard MCCB footprint for 400 A frames. Front IP40 protection keeps dust out of the trip unit and auxiliary contacts. The 2 HQ auxiliary switches are built in for status feedback to the PLC or alarm circuit.