What this MCCB delivers
The SENTRON 3VA2340-7HN32-0AF0 is a 3-pole molded case circuit breaker rated for 400 A continuous current at 40 °C, with a maximum interrupting capacity of 330 kA at 240 V AC. Per the datasheet, the continuous rating holds at 400 A through 50 °C, then derates to 385 A at 55 °C and 340 A at 70 °C — so the thermal curve is what governs real-world panel loading, not the nameplate number. The breaking capacity drops to 242 kA at 415 V and 7.5 kA at 690 V, which means this breaker is sized for high-fault low-voltage distribution, not 690 V motor circuits. It carries a line protection design, meaning the trip curve and thermal-magnetic response are tuned for feeder and main breaker duty rather than motor or generator protection. The auxiliary switch configuration includes one auxiliary switch plus one trip alarm switch HQ, which gives the panel builder a dry contact for remote status and a separate alarm contact that closes only on a trip event — useful for PLC-driven fault annunciation without extra interposing relays.
Physical fit and integration
Dimensions are 248 mm high, 138 mm wide, and 110 mm deep. The 138 mm width is the standard 3-pole MCCB footprint for this class — it occupies three 45 mm module positions on a DIN rail or panel-mount base. The 110 mm depth includes the arc chamber and terminals; verify clearance behind the panel door for the rotary handle or motor operator if fitted. The basic switch variant is 3VA2340-7HN32-0AA0, which is the thermal-magnetic core without the electronic trip unit or communications. This -0AF0 suffix adds the electronic trip unit with adjustable protections, so the panel wiring and bus bar connections are identical between the two — the swap is in the trip logic, not the mounting.